General

  • Target

    client.zip

  • Size

    6.0MB

  • Sample

    241018-yfv1yawhnr

  • MD5

    bc5f335eeaa0437570ecc20bd3bfcd65

  • SHA1

    729198e4717e77b8ad0b08587b68df6d0e454b56

  • SHA256

    bdc23aadf049a7a31bb439aa95e554752f98d3b727d98d288266229781c4e464

  • SHA512

    aa1dc14de45804d689c767c0780c18e3343c5410ecf52c02ce7a0ad23287a287394ac05fe097bb4661c101c660ff6ace437fa7ac62670604894a15162c446cdf

  • SSDEEP

    196608:yCQ8+u3k9Xv+G9KtgcZGxvfHgIqEBI0hDQYSIYVnpF98h:y85kNWDtg4kfxBPkxpF90

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Gibsons

C2

198.98.58.93:999

Mutex

obamanet_floyd999

Attributes
  • delay

    1

  • install

    true

  • install_file

    Core Sound Service.exe

  • install_folder

    %AppData%

aes.plain

Targets

    • Target

      munchenclient.exe

    • Size

      6.3MB

    • MD5

      b995bac46098f434d11d84ec79bcb6ac

    • SHA1

      3bb75ae3a8ec4054ccbeea3e3b2daf854bad81e2

    • SHA256

      0a7f831cb637214cae61b0e833bd5e5fabadd5dc5d4d68331fe76cce091e1542

    • SHA512

      72a515bfb170f0c06a26b3907cf31802a1ebb3b148d0f3a60d4424ea899f5f1b38d9a4bfd5fe25960d65eda8623e9ac12f1069d2940b1ad7e234c8bf78da54ce

    • SSDEEP

      196608:kpPx7IW+Ryxgp1qRAL1vJYrET+9b6P32gm/uMkOPx5WzN:k9x5gp1qSL1vJYrM8b+3NkOOPxy

    • AsyncRat

      AsyncRAT is designed to remotely monitor and control other computers written in C#.

    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • Modifies Windows Defender Real-time Protection settings

    • UAC bypass

    • Async RAT payload

    • Command and Scripting Interpreter: PowerShell

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

    • Checks computer location settings

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

    • Clipboard Data

      Adversaries may collect data stored in the clipboard from users copying information within or between applications.

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Unsecured Credentials: Credentials In Files

      Steal credentials from unsecured files.

    • Windows security modification

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Checks whether UAC is enabled

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Obfuscated Files or Information: Command Obfuscation

      Adversaries may obfuscate content during command execution to impede detection.

    • Enumerates processes with tasklist

    • Hide Artifacts: Hidden Files and Directories

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

MITRE ATT&CK Enterprise v15

Tasks