General

  • Target

    8657e3df341135059bc2ee1bd83a650b4621a8f66619c54e7db843dff46a05db

  • Size

    2.4MB

  • Sample

    240525-ambnwaga5v

  • MD5

    0898e7dae093d703034b7690c620a1d4

  • SHA1

    eb101867cdac2af77892276f44e92a7927663e0c

  • SHA256

    8657e3df341135059bc2ee1bd83a650b4621a8f66619c54e7db843dff46a05db

  • SHA512

    2b0408620d70819998c45c3faab421c12f981f20f94847ad6e31add14bb264eadb0c7ba66e1a91c1e65da6389c54136301342f3609879393107a62b209c09fca

  • SSDEEP

    49152:jxIRJF1HL+VdX68kU6JtTF+TxMoxc1TU+j+dAzGwlrh:jEJF16dX68d6tIuoITsdZ

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://steamcommunity.com/profiles/76561199689717899

https://t.me/copterwin

Attributes
  • user_agent

    Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Targets

    • Target

      8657e3df341135059bc2ee1bd83a650b4621a8f66619c54e7db843dff46a05db

    • Size

      2.4MB

    • MD5

      0898e7dae093d703034b7690c620a1d4

    • SHA1

      eb101867cdac2af77892276f44e92a7927663e0c

    • SHA256

      8657e3df341135059bc2ee1bd83a650b4621a8f66619c54e7db843dff46a05db

    • SHA512

      2b0408620d70819998c45c3faab421c12f981f20f94847ad6e31add14bb264eadb0c7ba66e1a91c1e65da6389c54136301342f3609879393107a62b209c09fca

    • SSDEEP

      49152:jxIRJF1HL+VdX68kU6JtTF+TxMoxc1TU+j+dAzGwlrh:jEJF16dX68d6tIuoITsdZ

    • Detect Vidar Stealer

    • Stealc

      Stealc is an infostealer written in C++.

    • Vidar

      Vidar is an infostealer based on Arkei stealer.

    • Detect binaries embedding considerable number of MFA browser extension IDs.

    • Detect binaries embedding considerable number of cryptocurrency wallet browser extension IDs.

    • Detects Windows executables referencing non-Windows User-Agents

    • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

    • Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion

    • Detects executables containing potential Windows Defender anti-emulation checks

    • Downloads MZ/PE file

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads user/profile data of local email clients

      Email clients store some user data on disk where infostealers will often target it.

    • Reads user/profile data of web browsers

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

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks