Resubmissions

28/02/2024, 09:17 UTC

240228-k84xnaga5v 10

15/01/2024, 07:41 UTC

240115-jh96bachc6 10

23/10/2023, 07:49 UTC

231023-jn2q5agh62 10

17/10/2023, 15:34 UTC

231017-szv76ada4t 10

General

  • Target

    vcac.exe

  • Size

    41.6MB

  • Sample

    231017-szv76ada4t

  • MD5

    0fb2af6afdbdaf9206a5505264f0bf71

  • SHA1

    2a6a04694b83ac2d4d0c207951fc838072804b6a

  • SHA256

    65af8761b34d50026541f9607547c27fb40af28dabbe3f705fe69b551faf8496

  • SHA512

    f5edebf5a9d4d0d4e5c11285febace0c65cf998573267da4016af563920de76f970b41661e2888de06cae737b56bc31a19c7f588993fc3e16828cb99c96ef7d7

  • SSDEEP

    393216:Q/joxiIE7YoPQtsTTp7Lk3meBcGfd0vYM2krlFk1mX1eq44:Ijoe7rPQts/RLaT5F0vYvXFg

Malware Config

Extracted

Family

quasar

Attributes
  • reconnect_delay

    1

Extracted

Family

quasar

Version

1.4.1

Botnet

user

C2

192.168.0.13:3440

elpepemanca.ddns.net:3440

Mutex

5950a87d-00d0-4fc0-a953-61143318e6d1

Attributes
  • encryption_key

    1A866C514D7B8C5F02AAA72B847C1F305295B74C

  • install_name

    Windows.exe

  • log_directory

    Logs

  • reconnect_delay

    1

  • startup_key

    Discord.exe

  • subdirectory

    System

Targets

    • Target

      vcac.exe

    • Size

      41.6MB

    • MD5

      0fb2af6afdbdaf9206a5505264f0bf71

    • SHA1

      2a6a04694b83ac2d4d0c207951fc838072804b6a

    • SHA256

      65af8761b34d50026541f9607547c27fb40af28dabbe3f705fe69b551faf8496

    • SHA512

      f5edebf5a9d4d0d4e5c11285febace0c65cf998573267da4016af563920de76f970b41661e2888de06cae737b56bc31a19c7f588993fc3e16828cb99c96ef7d7

    • SSDEEP

      393216:Q/joxiIE7YoPQtsTTp7Lk3meBcGfd0vYM2krlFk1mX1eq44:Ijoe7rPQts/RLaT5F0vYvXFg

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • Deletes shadow copies

      Ransomware often targets backup files to inhibit system recovery.

    • Disables Task Manager via registry modification

    • Drops file in Drivers directory

    • Modifies Windows Firewall

    • Possible privilege escalation attempt

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies file permissions

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads local data of messenger clients

      Infostealers often target stored data of messaging applications, which can include saved credentials and account information.

    • Reads user/profile data of web browsers

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

    • Accesses Microsoft Outlook profiles

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Adds Run key to start application

    • Drops desktop.ini file(s)

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

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

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v15

Tasks

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