General

  • Target

    vir.exe

  • Size

    354.3MB

  • Sample

    240524-ng6hysfa2z

  • MD5

    028198369d6f746e61bb3d7a6184c903

  • SHA1

    c25b526a8e92cead61067e02ebd26e8f9cddeb88

  • SHA256

    6151b06f01ef3a359f86b907c12e92235da0d2e6434e0ffd8113d3e5630a1d0b

  • SHA512

    d87586f6afdf386d9e9955be82e481fd2e1c68b152d543968f9963cb9d1a494e0d06aa52b230a095e36e004a52aa602a686ae7f5ad01278280b307920ec0ddc7

  • SSDEEP

    6291456:rdHVoFB/L6k3TpeRNvb1UxftqCtgZm1UQOwgb27CGhugobOzmuNYk:5IR1enREXhOwr7CGh7rmuNV

Malware Config

Extracted

Family

quasar

Attributes
  • reconnect_delay

    3000

Extracted

Family

quasar

Version

1.4.1

Botnet

romka

C2

jozzu420-51305.portmap.host:51305

Mutex

0445c342-b551-411c-9b80-cd437437f491

Attributes
  • encryption_key

    E1BF1D99459F04CAF668F054744BC2C514B0A3D6

  • install_name

    Romilyaa.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows 10 Boot

  • subdirectory

    SubDir

Targets

    • Target

      vir.exe

    • Size

      354.3MB

    • MD5

      028198369d6f746e61bb3d7a6184c903

    • SHA1

      c25b526a8e92cead61067e02ebd26e8f9cddeb88

    • SHA256

      6151b06f01ef3a359f86b907c12e92235da0d2e6434e0ffd8113d3e5630a1d0b

    • SHA512

      d87586f6afdf386d9e9955be82e481fd2e1c68b152d543968f9963cb9d1a494e0d06aa52b230a095e36e004a52aa602a686ae7f5ad01278280b307920ec0ddc7

    • SSDEEP

      6291456:rdHVoFB/L6k3TpeRNvb1UxftqCtgZm1UQOwgb27CGhugobOzmuNYk:5IR1enREXhOwr7CGh7rmuNV

    • Modifies WinLogon for persistence

    • Modifies firewall policy service

    • Modifies visibility of file extensions in Explorer

    • Modifies visiblity of hidden/system files in Explorer

    • PrivateLoader

      PrivateLoader is a downloader sold as a pay-per-install malware distribution service.

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • UAC bypass

    • Windows security bypass

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Disables RegEdit via registry modification

    • Downloads MZ/PE file

    • .NET Reactor proctector

      Detects an executable protected by an unregistered version of Eziriz's .NET Reactor.

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • 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 user/profile data of web browsers

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

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Windows security modification

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Drops Chrome extension

    • Drops desktop.ini file(s)

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • 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.

    • Modifies WinLogon

    • Writes to the Master Boot Record (MBR)

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

    • AutoIT Executable

      AutoIT scripts compiled to PE executables.

    • Drops file in System32 directory

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks