General

  • Target

    Uni.bat

  • Size

    1003KB

  • Sample

    240529-rfaxfagg7t

  • MD5

    d6d62f532591a7d034abac21eff0b57b

  • SHA1

    94c28efce74a67eb18d28bd51f65d285c8d1caef

  • SHA256

    070f7c800e8278b2cad111635cec3c501ff0aa9aa93fdd9529fcb8736a06d56d

  • SHA512

    26f94770e0d250aa6e063af8d5422848a72753a72b20e62b33a76fef5453cdd9e1f70466a935ef0dec145af9b293e12a6ec0e9101f0bd8e80edd3f4be706294a

  • SSDEEP

    24576:iGtp7xs0OFrW/eIeexsYboNCkhhdmjynCf7O:jXO5WnsYcTdPnwO

Malware Config

Extracted

Family

quasar

Attributes
  • reconnect_delay

    3000

Extracted

Family

quasar

Version

3.1.5

Botnet

SeroXen | v3.1.5 |

C2

runderscore00-25501.portmap.host:25501

Mutex

$Sxr-jy6vh8CtEJL5ceZuIb

Attributes
  • encryption_key

    JCa22tR8WnO00adn2TuE

  • install_name

    $sxr-powershell.exe

  • log_directory

    $sxr-Logs

  • reconnect_delay

    3000

  • startup_key

    Powershell

  • subdirectory

    $sxr-seroxen2

Targets

    • Target

      Uni.bat

    • Size

      1003KB

    • MD5

      d6d62f532591a7d034abac21eff0b57b

    • SHA1

      94c28efce74a67eb18d28bd51f65d285c8d1caef

    • SHA256

      070f7c800e8278b2cad111635cec3c501ff0aa9aa93fdd9529fcb8736a06d56d

    • SHA512

      26f94770e0d250aa6e063af8d5422848a72753a72b20e62b33a76fef5453cdd9e1f70466a935ef0dec145af9b293e12a6ec0e9101f0bd8e80edd3f4be706294a

    • SSDEEP

      24576:iGtp7xs0OFrW/eIeexsYboNCkhhdmjynCf7O:jXO5WnsYcTdPnwO

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Blocklisted process makes network request

    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Looks up external IP address via web service

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

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks