Analysis

  • max time kernel
    1753s
  • max time network
    1779s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31/03/2024, 00:39

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    57045c2bf3377b12aa5abce21cc0a99d

  • SHA1

    217202ed404f25fc550ad70fd7066b0fe8773ef9

  • SHA256

    f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2

  • SHA512

    9ab46cc194eeaabb75777457a01328f5a8d2ebf604efba0623575cf25c04e206e416ee72db17e3c92a9d363330f82fa3ce2aac64c2a4a61d4dce34d79b73366e

  • SSDEEP

    49152:Wv+I22SsaNYfdPBldt698dBcjHukuQPoGdhEQTHHB72eh2NT:Wvz22SsaNYfdPBldt6+dBcjHukuE

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Ratted

C2

140.238.91.110:44867

Mutex

be049c71-d631-4f68-8b3e-8e01081f2340

Attributes
  • encryption_key

    AA883CE7347A3543F81EBCDE3BBF3BFC9C60344E

  • install_name

    WOS64UPD.exe

  • log_directory

    Windows Update Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Updater

  • subdirectory

    Windows

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:512
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windows Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4212
    • C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe
      "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4856
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Windows Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:224
  • C:\Windows\system32\rundll32.exe
    "C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe
    1⤵
      PID:4884
    • C:\Windows\System32\svchost.exe
      C:\Windows\System32\svchost.exe -k UnistackSvcGroup
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:220

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe

      Filesize

      3.1MB

      MD5

      57045c2bf3377b12aa5abce21cc0a99d

      SHA1

      217202ed404f25fc550ad70fd7066b0fe8773ef9

      SHA256

      f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2

      SHA512

      9ab46cc194eeaabb75777457a01328f5a8d2ebf604efba0623575cf25c04e206e416ee72db17e3c92a9d363330f82fa3ce2aac64c2a4a61d4dce34d79b73366e

    • memory/220-20-0x0000024D68440000-0x0000024D68450000-memory.dmp

      Filesize

      64KB

    • memory/220-56-0x0000024D709B0000-0x0000024D709B1000-memory.dmp

      Filesize

      4KB

    • memory/220-55-0x0000024D708A0000-0x0000024D708A1000-memory.dmp

      Filesize

      4KB

    • memory/220-54-0x0000024D708A0000-0x0000024D708A1000-memory.dmp

      Filesize

      4KB

    • memory/220-52-0x0000024D70870000-0x0000024D70871000-memory.dmp

      Filesize

      4KB

    • memory/220-36-0x0000024D68540000-0x0000024D68550000-memory.dmp

      Filesize

      64KB

    • memory/512-1-0x00007FF8AE000000-0x00007FF8AEAC1000-memory.dmp

      Filesize

      10.8MB

    • memory/512-2-0x000000001BA30000-0x000000001BA40000-memory.dmp

      Filesize

      64KB

    • memory/512-8-0x00007FF8AE000000-0x00007FF8AEAC1000-memory.dmp

      Filesize

      10.8MB

    • memory/512-0-0x0000000000A20000-0x0000000000D44000-memory.dmp

      Filesize

      3.1MB

    • memory/4856-12-0x000000001C060000-0x000000001C112000-memory.dmp

      Filesize

      712KB

    • memory/4856-18-0x00000000016F0000-0x0000000001700000-memory.dmp

      Filesize

      64KB

    • memory/4856-17-0x00007FF8AE000000-0x00007FF8AEAC1000-memory.dmp

      Filesize

      10.8MB

    • memory/4856-16-0x000000001CBA0000-0x000000001CBDC000-memory.dmp

      Filesize

      240KB

    • memory/4856-15-0x000000001C010000-0x000000001C022000-memory.dmp

      Filesize

      72KB

    • memory/4856-11-0x000000001BF50000-0x000000001BFA0000-memory.dmp

      Filesize

      320KB

    • memory/4856-10-0x00000000016F0000-0x0000000001700000-memory.dmp

      Filesize

      64KB

    • memory/4856-9-0x00007FF8AE000000-0x00007FF8AEAC1000-memory.dmp

      Filesize

      10.8MB