Analysis

  • max time kernel
    152s
  • max time network
    155s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-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 6 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • 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 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 32 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ce9dbb3a5ca2777c073c0e1c6900e027.exe
    "C:\Users\Admin\AppData\Local\Temp\ce9dbb3a5ca2777c073c0e1c6900e027.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:992
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Roaming\project.sln
      2⤵
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:820
      • C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe
        "C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Roaming\project.sln"
        3⤵
        • Suspicious use of SetWindowsHookEx
        PID:828
    • 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:1292
      • 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:1196
        • 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:896
      • 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:1160

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\project.sln

    Filesize

    16B

    MD5

    bcddd763c8b71b8e2f0cffed40d9d346

    SHA1

    66ca272298710c520624648ff30e72cda8c2725c

    SHA256

    e6047eabd547f48e36fefe59fcd5049910a5af9aec74e1255195a13ada20bb25

    SHA512

    7efd8db6ade644d558229e39f365775a4bbdc4a8940c2884d7fef6f52f913d3cc7c9f4bd28c70d94351ddf3f6cf30e101e5fcc28b68094aa2c9d56c8f2896f40

  • 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

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

    Filesize

    2.0MB

    MD5

    d561a17252e9cbb698307f1142f4b524

    SHA1

    89490ef9113cad42253894332fb3efe033ca0ad3

    SHA256

    9599d3f669b050eda2ca52cf249766c0103d5d4ae3519e09bdeb6944cff31a0f

    SHA512

    da595d699140110db0614b104d53c8ba71f59ac510ef54f6f8a93fe70c7ac1825acc280d60bdb873544e164cfdcdb0adf1922a216c19a0f0aabaef8eb7a43264

  • memory/992-55-0x0000000004EA0000-0x00000000050A4000-memory.dmp

    Filesize

    2.0MB

  • memory/992-56-0x0000000075DA1000-0x0000000075DA3000-memory.dmp

    Filesize

    8KB

  • memory/992-54-0x0000000000820000-0x00000000008F6000-memory.dmp

    Filesize

    856KB

  • memory/1160-75-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/1160-70-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/1160-71-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/1160-73-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/1160-74-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/1160-78-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/1160-80-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/1292-68-0x0000000000510000-0x0000000000524000-memory.dmp

    Filesize

    80KB

  • memory/1292-69-0x0000000000750000-0x0000000000758000-memory.dmp

    Filesize

    32KB

  • memory/1292-63-0x0000000000190000-0x0000000000394000-memory.dmp

    Filesize

    2.0MB