Analysis

  • max time kernel
    150s
  • max time network
    165s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    03-09-2021 09:06

General

  • Target

    cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc.exe

  • Size

    792KB

  • MD5

    4ef1927705d28faf8456c200397d0af6

  • SHA1

    b92ab805e7c2884abcf371179b0d8989c4f90025

  • SHA256

    cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc

  • SHA512

    fe7f2405a8beb2bd70cfc689ce5ea3fc2cc4e03c72c925db698ea0e56b269b3e66c20f88afc382ea734e39b25cf66b0bcf24d72dab12d1b791ef91c690af17ac

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

192.168.1.154:4782

Mutex

VNM_MUTEX_ph9lkMeWS6xgznetvP

Attributes
  • encryption_key

    2ABr09PX2FCCobHek8sv

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Venom Client Startup

  • subdirectory

    SubDir

Signatures

  • Contains code to disable Windows Defender 3 IoCs

    A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

  • Modifies Windows Defender Real-time Protection settings 3 TTPs
  • Quasar Payload 3 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • VenomRAT

    VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.

  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

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

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Modifies system certificate store 2 TTPs 2 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 40 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc.exe
    "C:\Users\Admin\AppData\Local\Temp\cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc.exe"
    1⤵
    • Loads dropped DLL
    • Windows security modification
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1080
    • C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1544
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1624
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:676
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell" Get-MpPreference -verbose
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1740
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1384
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
        3⤵
          PID:1640
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\8XakQ7zvFHe0.bat" "
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:1436
        • C:\Windows\SysWOW64\chcp.com
          chcp 65001
          3⤵
            PID:824
          • C:\Windows\SysWOW64\PING.EXE
            ping -n 10 localhost
            3⤵
            • Runs ping.exe
            PID:1368
          • C:\Users\Admin\AppData\Local\Temp\cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc.exe
            "C:\Users\Admin\AppData\Local\Temp\cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc.exe"
            3⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1744

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\8XakQ7zvFHe0.bat

        MD5

        55b3887f747b31dc67a15d2f10594db8

        SHA1

        e4be96ba216111addde4ae87fcba639dced751ba

        SHA256

        0d4ad9dcfe3755ac08cfa10880fadd8bd11804fe66c2dd6b135087c4c6d65e69

        SHA512

        40e5ed3f644affdb04404ccb26572b070fb6180a6485fea250af96ad57e8f8256bd1c640cde63412cbe9936f0f17507ff0fa19db83b2017318b9a81311fd3222

      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

        MD5

        4ef1927705d28faf8456c200397d0af6

        SHA1

        b92ab805e7c2884abcf371179b0d8989c4f90025

        SHA256

        cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc

        SHA512

        fe7f2405a8beb2bd70cfc689ce5ea3fc2cc4e03c72c925db698ea0e56b269b3e66c20f88afc382ea734e39b25cf66b0bcf24d72dab12d1b791ef91c690af17ac

      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

        MD5

        4ef1927705d28faf8456c200397d0af6

        SHA1

        b92ab805e7c2884abcf371179b0d8989c4f90025

        SHA256

        cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc

        SHA512

        fe7f2405a8beb2bd70cfc689ce5ea3fc2cc4e03c72c925db698ea0e56b269b3e66c20f88afc382ea734e39b25cf66b0bcf24d72dab12d1b791ef91c690af17ac

      • \Users\Admin\AppData\Roaming\SubDir\Client.exe

        MD5

        4ef1927705d28faf8456c200397d0af6

        SHA1

        b92ab805e7c2884abcf371179b0d8989c4f90025

        SHA256

        cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc

        SHA512

        fe7f2405a8beb2bd70cfc689ce5ea3fc2cc4e03c72c925db698ea0e56b269b3e66c20f88afc382ea734e39b25cf66b0bcf24d72dab12d1b791ef91c690af17ac

      • memory/676-78-0x0000000000000000-mapping.dmp

      • memory/824-118-0x0000000000000000-mapping.dmp

      • memory/1080-60-0x0000000000D10000-0x0000000000D11000-memory.dmp

        Filesize

        4KB

      • memory/1080-63-0x00000000048C0000-0x00000000048C1000-memory.dmp

        Filesize

        4KB

      • memory/1080-62-0x0000000075801000-0x0000000075803000-memory.dmp

        Filesize

        8KB

      • memory/1368-119-0x0000000000000000-mapping.dmp

      • memory/1384-114-0x0000000000000000-mapping.dmp

      • memory/1436-116-0x0000000000000000-mapping.dmp

      • memory/1544-64-0x0000000000000000-mapping.dmp

      • memory/1624-73-0x00000000049B0000-0x00000000049B1000-memory.dmp

        Filesize

        4KB

      • memory/1624-70-0x0000000000E00000-0x0000000000E01000-memory.dmp

        Filesize

        4KB

      • memory/1624-66-0x0000000000000000-mapping.dmp

      • memory/1640-115-0x0000000000000000-mapping.dmp

      • memory/1740-79-0x0000000002350000-0x0000000002351000-memory.dmp

        Filesize

        4KB

      • memory/1740-83-0x000000007EF30000-0x000000007EF31000-memory.dmp

        Filesize

        4KB

      • memory/1740-84-0x0000000005630000-0x0000000005631000-memory.dmp

        Filesize

        4KB

      • memory/1740-89-0x0000000005730000-0x0000000005731000-memory.dmp

        Filesize

        4KB

      • memory/1740-90-0x0000000005800000-0x0000000005801000-memory.dmp

        Filesize

        4KB

      • memory/1740-97-0x00000000058D0000-0x00000000058D1000-memory.dmp

        Filesize

        4KB

      • memory/1740-98-0x00000000055F0000-0x00000000055F1000-memory.dmp

        Filesize

        4KB

      • memory/1740-112-0x00000000062E0000-0x00000000062E1000-memory.dmp

        Filesize

        4KB

      • memory/1740-113-0x00000000062F0000-0x00000000062F1000-memory.dmp

        Filesize

        4KB

      • memory/1740-80-0x00000000052A0000-0x00000000052A1000-memory.dmp

        Filesize

        4KB

      • memory/1740-77-0x0000000004772000-0x0000000004773000-memory.dmp

        Filesize

        4KB

      • memory/1740-76-0x0000000004770000-0x0000000004771000-memory.dmp

        Filesize

        4KB

      • memory/1740-75-0x00000000047B0000-0x00000000047B1000-memory.dmp

        Filesize

        4KB

      • memory/1740-74-0x00000000006F0000-0x00000000006F1000-memory.dmp

        Filesize

        4KB

      • memory/1740-69-0x0000000000000000-mapping.dmp

      • memory/1744-120-0x0000000000000000-mapping.dmp

      • memory/1744-123-0x00000000002F0000-0x00000000002F1000-memory.dmp

        Filesize

        4KB