General

  • Target

    MicrosoftCorporation.exe

  • Size

    1.2MB

  • Sample

    240528-yb2mxsae27

  • MD5

    f24c087bfd6a5a11079a0ff8ee778593

  • SHA1

    cbc18f13be5788356fd776b92c17f748ba9b313a

  • SHA256

    c9f5cfba7202db9fde50c885c96b787258358398b8738e4b3954845ef0936866

  • SHA512

    0325b5b97e41fd927aa8241f11813ceda7610e9815a18c97fc6257cfd681cf1c799b530f40f1cfab6944a2bc39ab32dc8a8dcb6347a4edb17781b286cc1cbf81

  • SSDEEP

    24576:vwx9zxRNc+szf5FE0JahIJqnRrOCIRwU0Wfuwj2KD8SUSh8oGaWR:vwxHk+o/EgEsgOV2Wfu+/8S4

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

OP

C2

20.117.108.240:5612

Mutex

HssS7dvHeccj

Attributes
  • delay

    3

  • install

    false

  • install_folder

    %AppData%

aes.plain

Extracted

Family

asyncrat

Version

0.5.8

Botnet

OS

C2

20.117.108.240:7825

Mutex

IOr8QBoiV215

Attributes
  • delay

    3

  • install

    false

  • install_folder

    %AppData%

aes.plain

Targets

    • Target

      MicrosoftCorporation.exe

    • Size

      1.2MB

    • MD5

      f24c087bfd6a5a11079a0ff8ee778593

    • SHA1

      cbc18f13be5788356fd776b92c17f748ba9b313a

    • SHA256

      c9f5cfba7202db9fde50c885c96b787258358398b8738e4b3954845ef0936866

    • SHA512

      0325b5b97e41fd927aa8241f11813ceda7610e9815a18c97fc6257cfd681cf1c799b530f40f1cfab6944a2bc39ab32dc8a8dcb6347a4edb17781b286cc1cbf81

    • SSDEEP

      24576:vwx9zxRNc+szf5FE0JahIJqnRrOCIRwU0Wfuwj2KD8SUSh8oGaWR:vwxHk+o/EgEsgOV2Wfu+/8S4

    • AsyncRat

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

    • UAC bypass

    • Downloads MZ/PE file

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Adds Run key to start application

    • Looks up external IP address via web service

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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks