General

  • Target

    Uni.bat

  • Size

    554KB

  • Sample

    240611-v9pjgavfjb

  • MD5

    d4c582bb5890af020c110f2b1de1d9db

  • SHA1

    04c25b115c7bdaced94746c4acf9b5245f064ea0

  • SHA256

    d34225f65c10acac82f381cf0f4281b2bc691afb2b72a1331acee94ca10e5c1c

  • SHA512

    4b104fd0f62ecab38cc02b4cd77e6b8b5bcaaa3d98ad48f537fc7a67aa7d72d4575026921b63c9a743a41faaf3dd3154717bd6690f87dcb4114da05106b93012

  • SSDEEP

    12288:ej66ws6Lf5zkTfhiOQbanOdEcl8uhySTl5fzu+oRjfTs1117e:e2xHf5WhsbWMzllySxQ4bc

Malware Config

Extracted

Family

quasar

Version

3.0.0

Botnet

Slave

C2

runderscore00-63294.portmap.host:63294

Mutex

QSR_MUTEX_KJSikjqkjc5AYGioTK

Attributes
  • encryption_key

    pN2MVZndQf3jaY1iGlHN

  • install_name

    $sxr-powershell.exe

  • log_directory

    $sxr-Logs

  • reconnect_delay

    3000

  • startup_key

    Powershell

  • subdirectory

    $sxr-seroxen2

Targets

    • Target

      Uni.bat

    • Size

      554KB

    • MD5

      d4c582bb5890af020c110f2b1de1d9db

    • SHA1

      04c25b115c7bdaced94746c4acf9b5245f064ea0

    • SHA256

      d34225f65c10acac82f381cf0f4281b2bc691afb2b72a1331acee94ca10e5c1c

    • SHA512

      4b104fd0f62ecab38cc02b4cd77e6b8b5bcaaa3d98ad48f537fc7a67aa7d72d4575026921b63c9a743a41faaf3dd3154717bd6690f87dcb4114da05106b93012

    • SSDEEP

      12288:ej66ws6Lf5zkTfhiOQbanOdEcl8uhySTl5fzu+oRjfTs1117e:e2xHf5WhsbWMzllySxQ4bc

    • 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.

    • Sets service image path in registry

    • 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

    • Enumerates connected drives

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

    • 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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v13

Execution

Command and Scripting Interpreter

1
T1059

PowerShell

1
T1059.001

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Modify Registry

1
T1112

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Discovery

Query Registry

6
T1012

System Information Discovery

6
T1082

Peripheral Device Discovery

1
T1120

Tasks