Analysis

  • max time kernel
    154s
  • max time network
    159s
  • platform
    windows10-1703_x64
  • resource
    win10-20220812-en
  • resource tags

    arch:x64arch:x86image:win10-20220812-enlocale:en-usos:windows10-1703-x64system
  • submitted
    19-01-2023 09:19

General

  • Target

    75031e206522faaec5981f7cf411472b23ee0508748cd5c1453e390c6facffc8.exe

  • Size

    536KB

  • MD5

    8c274dad5fd77b0692ca5c299ffb0d26

  • SHA1

    5dda42516b5f3b65093dae4b55506e9c8813d745

  • SHA256

    75031e206522faaec5981f7cf411472b23ee0508748cd5c1453e390c6facffc8

  • SHA512

    370c2b2f4a2342b1d3281e2b8d2a426606e0e828b4342981bcd42b16f78dd071d419d646e3c94292cf11e287347b48f2231de91a21ff2856ea08e2085da335b9

  • SSDEEP

    12288:k04p+yRb8qXeSCTQVpyQJPiDZOjVYXRTyyss:k0M8qXzCTQ/yQWRyq

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office01

C2

172.81.131.113:4782

Mutex

VNM_MUTEX_OFUOtYdHQP7Y7fAk1P

Attributes
  • encryption_key

    xufMEowCMSpdPlEx87tq

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    mvscs

  • subdirectory

    SubDir

Signatures

  • Contains code to disable Windows Defender 5 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 3 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 5 IoCs
  • VenomRAT

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

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

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

  • 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 registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\75031e206522faaec5981f7cf411472b23ee0508748cd5c1453e390c6facffc8.exe
    "C:\Users\Admin\AppData\Local\Temp\75031e206522faaec5981f7cf411472b23ee0508748cd5c1453e390c6facffc8.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4124
    • C:\Users\Admin\AppData\Local\Temp\vnmtub.exe
      "C:\Users\Admin\AppData\Local\Temp\vnmtub.exe"
      2⤵
      • Modifies Windows Defender Real-time Protection settings
      • Executes dropped EXE
      • Windows security modification
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4240
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\vnmtub.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4876
      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4020
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
          4⤵
          • Creates scheduled task(s)
          PID:2836
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:5076
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:908
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
            PID:1828
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\p7vbd2SWQgm6.bat" "
          3⤵
            PID:1788

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\p7vbd2SWQgm6.bat

        Filesize

        203B

        MD5

        09b61a4f440fb2d3af75b4fa3687d3e0

        SHA1

        a6ae202c59c34a76fc89631fdba3874b7d1a6ed7

        SHA256

        bd4a6bef809a2e0fd7a484d9b5ef7c794fb18c38dd473702ab5941d1ba4b7fd4

        SHA512

        bfd760f39d9f31d21db2d0614c4818160ac763f6cf66c70d9a947f681b5a66d2c84abc7afe89b625857dff7586f4cc812bccd4a008fe84de4c2bdb9fdd01b62e

      • C:\Users\Admin\AppData\Local\Temp\vnmtub.exe

        Filesize

        534KB

        MD5

        2785b4bbb80b75836c685ac8a1a24f27

        SHA1

        32dcef1d5f8e45655478c3dd960e6f9422af691c

        SHA256

        7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

        SHA512

        fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

      • C:\Users\Admin\AppData\Local\Temp\vnmtub.exe

        Filesize

        534KB

        MD5

        2785b4bbb80b75836c685ac8a1a24f27

        SHA1

        32dcef1d5f8e45655478c3dd960e6f9422af691c

        SHA256

        7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

        SHA512

        fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

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

        Filesize

        534KB

        MD5

        2785b4bbb80b75836c685ac8a1a24f27

        SHA1

        32dcef1d5f8e45655478c3dd960e6f9422af691c

        SHA256

        7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

        SHA512

        fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

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

        Filesize

        534KB

        MD5

        2785b4bbb80b75836c685ac8a1a24f27

        SHA1

        32dcef1d5f8e45655478c3dd960e6f9422af691c

        SHA256

        7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

        SHA512

        fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

      • memory/908-747-0x0000000000000000-mapping.dmp

      • memory/1788-755-0x0000000000000000-mapping.dmp

      • memory/1828-753-0x0000000000000000-mapping.dmp

      • memory/2836-456-0x0000000000000000-mapping.dmp

      • memory/4020-308-0x0000000000000000-mapping.dmp

      • memory/4020-580-0x0000000006600000-0x000000000660A000-memory.dmp

        Filesize

        40KB

      • memory/4124-160-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-148-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-124-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-125-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-126-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-127-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-128-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-129-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-130-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-131-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-132-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-133-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-134-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-135-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-136-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-137-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-138-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-166-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-140-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-141-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-142-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-143-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-144-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-145-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-146-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-147-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-165-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-149-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-150-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-151-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-152-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-153-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-154-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-155-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-156-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-157-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-158-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-122-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-159-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-161-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-162-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-163-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-172-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-123-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-139-0x0000000000400000-0x0000000000489000-memory.dmp

        Filesize

        548KB

      • memory/4124-167-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-168-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-169-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-171-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-173-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-170-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-174-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-164-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-175-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-176-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-177-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-178-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-179-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-116-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-117-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-118-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-119-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-120-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4124-121-0x0000000077480000-0x000000007760E000-memory.dmp

        Filesize

        1.6MB

      • memory/4240-192-0x0000000000000000-mapping.dmp

      • memory/4240-239-0x00000000001F0000-0x000000000027C000-memory.dmp

        Filesize

        560KB

      • memory/4240-244-0x0000000004BC0000-0x0000000004C52000-memory.dmp

        Filesize

        584KB

      • memory/4240-255-0x0000000004B20000-0x0000000004B86000-memory.dmp

        Filesize

        408KB

      • memory/4240-286-0x0000000005E10000-0x0000000005E4E000-memory.dmp

        Filesize

        248KB

      • memory/4240-265-0x0000000005A40000-0x0000000005A52000-memory.dmp

        Filesize

        72KB

      • memory/4240-242-0x0000000005020000-0x000000000551E000-memory.dmp

        Filesize

        5.0MB

      • memory/4876-288-0x0000000000000000-mapping.dmp

      • memory/5076-421-0x0000000006DC0000-0x0000000006DE2000-memory.dmp

        Filesize

        136KB

      • memory/5076-502-0x0000000009210000-0x00000000092A4000-memory.dmp

        Filesize

        592KB

      • memory/5076-427-0x0000000007740000-0x0000000007A90000-memory.dmp

        Filesize

        3.3MB

      • memory/5076-489-0x0000000008ED0000-0x0000000008EEE000-memory.dmp

        Filesize

        120KB

      • memory/5076-488-0x0000000008F10000-0x0000000008F43000-memory.dmp

        Filesize

        204KB

      • memory/5076-424-0x00000000076D0000-0x0000000007736000-memory.dmp

        Filesize

        408KB

      • memory/5076-498-0x0000000009040000-0x00000000090E5000-memory.dmp

        Filesize

        660KB

      • memory/5076-440-0x00000000075A0000-0x00000000075BC000-memory.dmp

        Filesize

        112KB

      • memory/5076-396-0x0000000006E90000-0x00000000074B8000-memory.dmp

        Filesize

        6.2MB

      • memory/5076-708-0x00000000069A0000-0x00000000069BA000-memory.dmp

        Filesize

        104KB

      • memory/5076-713-0x0000000006990000-0x0000000006998000-memory.dmp

        Filesize

        32KB

      • memory/5076-391-0x0000000004350000-0x0000000004386000-memory.dmp

        Filesize

        216KB

      • memory/5076-455-0x0000000007E10000-0x0000000007E86000-memory.dmp

        Filesize

        472KB

      • memory/5076-311-0x0000000000000000-mapping.dmp

      • memory/5076-443-0x0000000008050000-0x000000000809B000-memory.dmp

        Filesize

        300KB