Resubmissions

04-06-2021 01:54

210604-q1mqz6zlf2 10

03-06-2021 12:45

210603-5fgyg6535j 10

General

  • Target

    570fbe91fdd6d1eb8cfd2f03c032cdde.exe

  • Size

    872KB

  • Sample

    210603-5fgyg6535j

  • MD5

    570fbe91fdd6d1eb8cfd2f03c032cdde

  • SHA1

    59d07617c682fed330d82b1d97f1bf32c30c6ff1

  • SHA256

    b4a1845a21726b4826eb4157114d424c9a0f1c3112f67f587cbea352dd33ac61

  • SHA512

    e0cd9f67e26140b22dbcee760b0690e5dd2bb0242091d3c759c123789c6b2bb8abbf1c2a80d6b4e1b00f9097f4f782ba2035041c92afc2280dd75a9dc21f7fb6

Malware Config

Extracted

Family

vidar

Version

39.2

Botnet

517

C2

https://dimashub.tumblr.com

Attributes
  • profile_id

    517

Targets

    • Target

      570fbe91fdd6d1eb8cfd2f03c032cdde.exe

    • Size

      872KB

    • MD5

      570fbe91fdd6d1eb8cfd2f03c032cdde

    • SHA1

      59d07617c682fed330d82b1d97f1bf32c30c6ff1

    • SHA256

      b4a1845a21726b4826eb4157114d424c9a0f1c3112f67f587cbea352dd33ac61

    • SHA512

      e0cd9f67e26140b22dbcee760b0690e5dd2bb0242091d3c759c123789c6b2bb8abbf1c2a80d6b4e1b00f9097f4f782ba2035041c92afc2280dd75a9dc21f7fb6

    • Deletes Windows Defender Definitions

      Uses mpcmdrun utility to delete all AV definitions.

    • Djvu Ransomware

      Ransomware which is a variant of the STOP family.

    • Vidar

      Vidar is an infostealer based on Arkei stealer.

    • Vidar Stealer

    • Disables Task Manager via registry modification

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • 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

Command-Line Interface

1
T1059

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Impair Defenses

1
T1562

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