General

  • Target

    New1.bat

  • Size

    1002KB

  • Sample

    240528-qzvwaaff9t

  • MD5

    f6d5bfaee8a55ff72c7b453fda066d62

  • SHA1

    7d737d53013990e5d05076b7206e43eb4793fc7f

  • SHA256

    3ff8b6a041a96625d730dfe770eb6e84be8ce99fc50a0027724e48394f053308

  • SHA512

    e300c15bef9e898e7abd4ecf6759c0e60829e8d9b507e257359b0c0342c56d56adf7924c76ffbbee4c42e1b1ea229b7032d177849d2668720090780190b7f284

  • SSDEEP

    12288:NzPPeJOTZMGuIl99I2FxGwvYXDSeengmfn5tKvy0H5JbcGfRZIJZ32hxnQxCGaF9:NDeYum99IGP8f2rRO5JFPIJZ8GaF8XmB

Malware Config

Extracted

Family

quasar

Attributes
  • reconnect_delay

    3000

Extracted

Family

quasar

Version

3.1.5

Botnet

Video

C2

runderscore00-25501.portmap.host:25501

Mutex

$Sxr-oWTh3ZS9htfe80iIl5

Attributes
  • encryption_key

    zK8u0rpHf4TJzGf65Flt

  • install_name

    Win11.exe

  • log_directory

    $sxr-Logs

  • reconnect_delay

    3000

  • startup_key

    Windows 11 Boot

  • subdirectory

    Win11

Targets

    • Target

      New1.bat

    • Size

      1002KB

    • MD5

      f6d5bfaee8a55ff72c7b453fda066d62

    • SHA1

      7d737d53013990e5d05076b7206e43eb4793fc7f

    • SHA256

      3ff8b6a041a96625d730dfe770eb6e84be8ce99fc50a0027724e48394f053308

    • SHA512

      e300c15bef9e898e7abd4ecf6759c0e60829e8d9b507e257359b0c0342c56d56adf7924c76ffbbee4c42e1b1ea229b7032d177849d2668720090780190b7f284

    • SSDEEP

      12288:NzPPeJOTZMGuIl99I2FxGwvYXDSeengmfn5tKvy0H5JbcGfRZIJZ32hxnQxCGaF9:NDeYum99IGP8f2rRO5JFPIJZ8GaF8XmB

    • 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 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.

    • 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