Analysis

  • max time kernel
    143s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/01/2023, 07:26

General

  • Target

    ce9dbb3a5ca2777c073c0e1c6900e027.exe

  • Size

    836KB

  • MD5

    ce9dbb3a5ca2777c073c0e1c6900e027

  • SHA1

    693fca63059c8b9d462512d83da87fba48cb7d5a

  • SHA256

    4a181732e82bac9de2926c6982ff94b2f513e8751a76f6eb3bb9eba4f7634f3d

  • SHA512

    4818fa9a25e5a8c73e146aea3db0c20cdbdd026120e1d246887138da43a98d90d8c381413803b887a5d230ea6a072cba35f100917d38982cfb1046edf5420f7a

  • SSDEEP

    24576:DWxUa9DVRtT/VocrrfCD6prOOM40gCbuBAjO:DTa9FJvW6p3M4NAj

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

45.138.16.40:4782

Mutex

24c78a87-92d6-451f-a83f-8c6ef78bf528

Attributes
  • encryption_key

    79B37357B4158ED84F18F4E85B7713CF2D04A0D9

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Uses the VBS compiler for execution 1 TTPs
  • Looks up external IP address via web service 1 IoCs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies registry class 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ce9dbb3a5ca2777c073c0e1c6900e027.exe
    "C:\Users\Admin\AppData\Local\Temp\ce9dbb3a5ca2777c073c0e1c6900e027.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:2248
    • C:\Users\Admin\AppData\Roaming\systemx888.exe
      "C:\Users\Admin\AppData\Roaming\systemx888.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:2432
      • C:\Windows\SysWOW64\cmd.exe
        "cmd" /C schtasks /create /tn \pGLCR /tr "C:\Users\Admin\AppData\Roaming\systemx888.exe" /st 00:00 /du 9999:59 /sc once /ri 60 /f
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1492
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /create /tn \pGLCR /tr "C:\Users\Admin\AppData\Roaming\systemx888.exe" /st 00:00 /du 9999:59 /sc once /ri 60 /f
          4⤵
          • Creates scheduled task(s)
          PID:704
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of SetWindowsHookEx
        PID:2028
  • C:\Windows\system32\OpenWith.exe
    C:\Windows\system32\OpenWith.exe -Embedding
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:4620

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\systemx888.exe

    Filesize

    2.0MB

    MD5

    d561a17252e9cbb698307f1142f4b524

    SHA1

    89490ef9113cad42253894332fb3efe033ca0ad3

    SHA256

    9599d3f669b050eda2ca52cf249766c0103d5d4ae3519e09bdeb6944cff31a0f

    SHA512

    da595d699140110db0614b104d53c8ba71f59ac510ef54f6f8a93fe70c7ac1825acc280d60bdb873544e164cfdcdb0adf1922a216c19a0f0aabaef8eb7a43264

  • C:\Users\Admin\AppData\Roaming\systemx888.exe

    Filesize

    2.0MB

    MD5

    d561a17252e9cbb698307f1142f4b524

    SHA1

    89490ef9113cad42253894332fb3efe033ca0ad3

    SHA256

    9599d3f669b050eda2ca52cf249766c0103d5d4ae3519e09bdeb6944cff31a0f

    SHA512

    da595d699140110db0614b104d53c8ba71f59ac510ef54f6f8a93fe70c7ac1825acc280d60bdb873544e164cfdcdb0adf1922a216c19a0f0aabaef8eb7a43264

  • memory/2028-144-0x00000000069C0000-0x0000000006FD8000-memory.dmp

    Filesize

    6.1MB

  • memory/2028-141-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/2028-142-0x00000000052B0000-0x0000000005342000-memory.dmp

    Filesize

    584KB

  • memory/2028-143-0x0000000002E30000-0x0000000002E3A000-memory.dmp

    Filesize

    40KB

  • memory/2028-145-0x0000000006470000-0x00000000064C0000-memory.dmp

    Filesize

    320KB

  • memory/2028-146-0x00000000066E0000-0x0000000006792000-memory.dmp

    Filesize

    712KB

  • memory/2028-147-0x0000000008000000-0x0000000008066000-memory.dmp

    Filesize

    408KB

  • memory/2248-132-0x0000000000280000-0x0000000000356000-memory.dmp

    Filesize

    856KB

  • memory/2432-137-0x00000000055A0000-0x0000000005B44000-memory.dmp

    Filesize

    5.6MB

  • memory/2432-136-0x00000000005E0000-0x00000000007E4000-memory.dmp

    Filesize

    2.0MB