General

  • Target

    a55150bb6fe4336aaf6ba17fa232005235c81881cf5a07763c368161f06f850b

  • Size

    694KB

  • Sample

    210915-je915sdbfj

  • MD5

    f886c9b4663164796def3ced70a60b6e

  • SHA1

    8e03d18b3c679a14d47cb3202f84fe57c11d762d

  • SHA256

    a55150bb6fe4336aaf6ba17fa232005235c81881cf5a07763c368161f06f850b

  • SHA512

    8504ca95ade3dce108b0e7a9e7f828a203360c58631bd2d5c50557911cfad4632e767bca0bad3ec989ef1a8f938a1a71119b017cbf319585e6870b11201f0c94

Malware Config

Extracted

Family

vidar

Version

40.6

Botnet

517

C2

https://dimonbk83.tumblr.com/

Attributes
  • profile_id

    517

Targets

    • Target

      a55150bb6fe4336aaf6ba17fa232005235c81881cf5a07763c368161f06f850b

    • Size

      694KB

    • MD5

      f886c9b4663164796def3ced70a60b6e

    • SHA1

      8e03d18b3c679a14d47cb3202f84fe57c11d762d

    • SHA256

      a55150bb6fe4336aaf6ba17fa232005235c81881cf5a07763c368161f06f850b

    • SHA512

      8504ca95ade3dce108b0e7a9e7f828a203360c58631bd2d5c50557911cfad4632e767bca0bad3ec989ef1a8f938a1a71119b017cbf319585e6870b11201f0c94

    • Detected Djvu ransomware

    • Djvu Ransomware

      Ransomware which is a variant of the STOP family.

    • Vidar

      Vidar is an infostealer based on Arkei stealer.

    • suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

      suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

    • suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

      suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

    • suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload

      suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload

    • suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

      suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

    • Vidar Stealer

    • Downloads MZ/PE file

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies file permissions

    • 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.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Registry Run Keys / Startup Folder

1
T1060

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Defense Evasion

File Permissions Modification

1
T1222

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

2
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

3
T1005

Tasks