Trojan.Win32.Autoit

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan

A malicious program designed to electronically spy on the user’s activities (intercept keyboard input, take screenshots, capture a list of active applications, etc.). The collected information is sent to the cybercriminal by various means, including email, FTP, and HTTP (by sending data in a request).

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Once launched, the Trojan performs the following actions:

• It attempts to connect to the following HTTP servers:

  87.***.14
  
  
  
  69.***.224
  
  
  
  

• It creates the directory:

  
  
  
  %System%<rnd>

  where <rnd> is a random five-digit decimal number.
• It extracts a file from its body and saves it in the system as:

  %System%<rnd>svchost.exe

  (525 312 bytes; detected by Kaspersky Anti-Virus as "not-a-virus:Monitor.Win32.Ardamax.ae")
• It launches the extracted file for execution.
• It modifies the values of the following system registry keys:

  
  
  
  [HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesExplorer]
  
  
  
  "NofolderOptions" = 0
  
  
  
  
  
  
  
  [HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem]
  
  
  
  "DisableTaskMgr" = 0
  
  
  
  
  
  
  
  [HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem]
  
  
  
  "DisableRegistryTools" = 1
  
  
  
  

  The modification of the last key disables the registry editor.
• It creates the file:

  
  
  
  %System%setup.ini (96 bytes)

  with the following content:

  
  
  
  [Autorun]
  
  
  
  Open=regsvr.exe
  
  
  
  Shellexecute=regsvr.exe
  
  
  
  ShellOpencommand=regsvr.exe
  
  
  
  Shell=Open
  
  
  
  

• It launches the system command interpreter "cmd.exe" with the following parameters:

  /C AT /delete /yes

  This cancels all scheduled tasks in Windows Task Scheduler.

  /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su %System%svchost.exe

Every day at 9:00, Windows Task Scheduler will launch a copy of the Trojan.

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