General

  • Target
    k3t05Da.exe
  • Size 5.9MB
  • Sample250322-qf5alstset
  • SHA256 fb0fe7e716caf3e0dcb1fbb6824466f807aa85295bfc7ed7046febf3331dab88
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Language
  • ps1

Deobfuscated
Source
URLs
  • ps1.dropper

    http://196.251.91.42/up/uploads/encryption02.jpg

  • exe.dropper

    http://196.251.91.42/up/uploads/encryption02.jpg

Extracted

Family
  • xworm

Version
  • 5.0

C2
  • httpss.myvnc.com:1907

Mutex
  • xWIArEKzuXpfRVkJ

Attributes
  • install_file

    USB.exe

aes.plain

Targets

    • Target
      k3t05Da.exe
    • Size 5.9MB
    • SHA256 fb0fe7e716caf3e0dcb1fbb6824466f807aa85295bfc7ed7046febf3331dab88
    • MD5 SHA1 SHA512 SSDEEP
    • Detect Xworm Payload

    • Xworm

      Xworm is a remote access trojan written in C#.

    • Xworm family

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Blocklisted process makes network request

    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Drops startup file

    • Loads dropped DLL

    • Obfuscated with Agile.Net obfuscator

      Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Checks whether UAC is enabled

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks