General

  • Target

    42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe

  • Size

    355KB

  • Sample

    240526-bewjrahb21

  • MD5

    8a848d90a8d7a8c79b80d2dd8d330d9d

  • SHA1

    6694c6e16123598f1665b7c68da40fd342e683fa

  • SHA256

    42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d

  • SHA512

    d67683611a368964d4dbc2ed85c9c458e5502cc8fb50608ef184cdb574e55636f800c471f8224b1fe82874175f9802d07a8dacdac5eeb73bd72a35bb7b71d54e

  • SSDEEP

    6144:FHAqyjjclaS6sR38CS0iD7RjPyvB7m2Rx6PLfciHid4Fwem:JAqyjjmK06ByZ7m2yee

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

      42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe

    • Size

      355KB

    • MD5

      8a848d90a8d7a8c79b80d2dd8d330d9d

    • SHA1

      6694c6e16123598f1665b7c68da40fd342e683fa

    • SHA256

      42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d

    • SHA512

      d67683611a368964d4dbc2ed85c9c458e5502cc8fb50608ef184cdb574e55636f800c471f8224b1fe82874175f9802d07a8dacdac5eeb73bd72a35bb7b71d54e

    • SSDEEP

      6144:FHAqyjjclaS6sR38CS0iD7RjPyvB7m2Rx6PLfciHid4Fwem:JAqyjjmK06ByZ7m2yee

    • 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

    • Checks computer location settings

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

    • 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