General

  • Target

    B9B1.exe

  • Size

    684KB

  • Sample

    210213-27cx2zy3wa

  • MD5

    7efdbcd2dda98974f89290ce0a02cdc7

  • SHA1

    cbae61ac09fe75b570bee392aa70310ef4d94362

  • SHA256

    eb8de87523800e3aa747857a06938f3af3856fbd42be025688e2ff50248ac197

  • SHA512

    b9d334d10bc4c02007efcdd789a4fb91bffa3790c8d8357f438cd167c86097acc0b6d4889c1b81de77c42e8b7d5f04f3a8dffca80adc2a9148051b68d1215adc

Malware Config

Targets

    • Target

      B9B1.exe

    • Size

      684KB

    • MD5

      7efdbcd2dda98974f89290ce0a02cdc7

    • SHA1

      cbae61ac09fe75b570bee392aa70310ef4d94362

    • SHA256

      eb8de87523800e3aa747857a06938f3af3856fbd42be025688e2ff50248ac197

    • SHA512

      b9d334d10bc4c02007efcdd789a4fb91bffa3790c8d8357f438cd167c86097acc0b6d4889c1b81de77c42e8b7d5f04f3a8dffca80adc2a9148051b68d1215adc

    • Deletes Windows Defender Definitions

      Uses mpcmdrun utility to delete all AV definitions.

    • Djvu Ransomware

      Ransomware which is a variant of the STOP family.

    • Taurus Stealer

      Taurus is an infostealer first seen in June 2020.

    • Vidar

      Vidar is an infostealer based on Arkei stealer.

    • Disables Task Manager via registry modification

    • Drops file in Drivers directory

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies file permissions

    • 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 2FA software files, possible credential harvesting

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Adds Run key to start application

    • Checks installed software on the system

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

    • Looks up external IP address via web service

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

    • Enumerates physical storage devices

      Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

MITRE ATT&CK Enterprise v6

Tasks