Resubmissions

10/03/2023, 22:01

230310-1xerdshc7x7

14/02/2023, 16:10

230214-tmg1faee727

31/01/2023, 07:47

230131-jmw49afe5410

26/12/2022, 21:03

221226-zv36jaha4x10

24/12/2022, 19:27

221224-x6gessdf7z10

13/12/2022, 03:51

221213-eenexsgc4v10

12/12/2022, 11:33

221212-npbnjsbc2810

06/12/2022, 06:29

221206-g8658sca548

05/12/2022, 06:17

221205-g19ldsgh7x10

General

  • Target
    RustExternal_nls.exe
  • Size 658KB
  • Sample221212-npbnjsbc28
  • SHA256 c6dda31fa6cb4ce140f62c9ce604672fa4a9ba5d1792f2d77f3cfcb43b3227ac
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • asyncrat

Version
  • 0.5.7B

Botnet
  • System Guard Runtime

C2
  • 85.105.88.221:2531

Mutex
  • System Guard Runtime

Attributes
  • delay

    3

  • install

    false

  • install_file

    System Guard Runtime

  • install_folder

    %AppData%

aes.plain

Extracted

Family
  • asyncrat

Version
  • 0.5.7B

Botnet
  • DefenderSmartScren

C2
  • 217.64.31.3:8437

Mutex
  • DefenderSmartScren

Attributes
  • delay

    3

  • install

    false

  • install_file

    SecurityHealtheurvice.exe

  • install_folder

    %AppData%

aes.plain

Targets

    • Target
      RustExternal_nls.exe
    • Size 658KB
    • SHA256 c6dda31fa6cb4ce140f62c9ce604672fa4a9ba5d1792f2d77f3cfcb43b3227ac
    • MD5 SHA1 SHA512 SSDEEP
    • AsyncRat

      AsyncRAT is designed to remotely monitor and control other computers.

    • Async RAT payload

    • Blocklisted process makes network request

    • Downloads MZ/PE file

    • Executes dropped EXE

    • UPX packed file

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

    • Checks computer location settings

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

    • Loads dropped DLL

    • Adds Run key to start application

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v6

Tasks