Analysis

  • max time kernel
    157s
  • max time network
    182s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-12-2023 22:13

General

  • Target

    0fdee64f4eb558b0d6e1a5a568095e40.exe

  • Size

    880KB

  • MD5

    0fdee64f4eb558b0d6e1a5a568095e40

  • SHA1

    55ca1696afa36ab5f36d3c2944a03bb988335d97

  • SHA256

    c7a070b7e06000af25f9fe5f44cfacfd4ac4a02371369267ad10cf3beaed8d4b

  • SHA512

    ddf3de5d0f69a29818f683c46ccd70891455f8781e46cf1ac37b740b67e74eea4408920ef3a54878707c81b74b2dc13337838a6521880a0c9f912cc7251bfe44

  • SSDEEP

    24576:zhOjdWkJhngpn9kNsMwbMgkK589joyhkIS:zgjdbDnKkK3MgkK56

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

SEP05

C2

23.105.131.187:7812

Mutex

VNM_MUTEX_ea14HLQ5adxyrFdD2X

Attributes
  • encryption_key

    jUWfdDb1toPE0KAlGJWH

  • install_name

    Windows Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update Service

  • subdirectory

    Windows Security Update

Signatures

  • Contains code to disable Windows Defender 1 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 4 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • VenomRAT

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

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 1 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.

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 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 behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 34 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe
    "C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2636
    • C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe
      "C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe"
      2⤵
      • Modifies Windows Defender Real-time Protection settings
      • Checks computer location settings
      • Windows security modification
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4800
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Windows Update Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:3760
      • C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe
        "C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1008
        • C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe
          "C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:1728
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "Windows Update Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe" /rl HIGHEST /f
            5⤵
            • Creates scheduled task(s)
            PID:1604
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1412
      • 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:1424
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
            PID:4984
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4800 -s 2492
          3⤵
          • Program crash
          PID:3684
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4800 -ip 4800
      1⤵
        PID:764

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\0fdee64f4eb558b0d6e1a5a568095e40.exe.log

        Filesize

        507B

        MD5

        8cf94b5356be60247d331660005941ec

        SHA1

        fdedb361f40f22cb6a086c808fc0056d4e421131

        SHA256

        52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

        SHA512

        b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_15zzq1yz.xc4.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • C:\Users\Admin\AppData\Local\Temp\tSr4f6EleZXQ.bat

        Filesize

        229B

        MD5

        43d543e5d161b2b8e4f25eaa1554fd29

        SHA1

        0cfd0be3874207a243ed9b714855a13b556dff3e

        SHA256

        61ba014e1c98a41743e9230886a46e752593026c55f0d9e6d95631622e95c532

        SHA512

        2f355c01e44f55f46cbe6d92d7afc280952e521a4a1efbe61fb7d57bb5c8764ff5d94489436652b33a7394bcb117ea61c33fa13d4b40dc49807e56d1882a7d2a

      • C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe

        Filesize

        880KB

        MD5

        0fdee64f4eb558b0d6e1a5a568095e40

        SHA1

        55ca1696afa36ab5f36d3c2944a03bb988335d97

        SHA256

        c7a070b7e06000af25f9fe5f44cfacfd4ac4a02371369267ad10cf3beaed8d4b

        SHA512

        ddf3de5d0f69a29818f683c46ccd70891455f8781e46cf1ac37b740b67e74eea4408920ef3a54878707c81b74b2dc13337838a6521880a0c9f912cc7251bfe44

      • memory/1008-35-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/1008-23-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/1008-24-0x00000000050A0000-0x00000000050B0000-memory.dmp

        Filesize

        64KB

      • memory/1412-69-0x0000000007FA0000-0x000000000861A000-memory.dmp

        Filesize

        6.5MB

      • memory/1412-75-0x0000000007BA0000-0x0000000007BB4000-memory.dmp

        Filesize

        80KB

      • memory/1412-25-0x0000000002C90000-0x0000000002CC6000-memory.dmp

        Filesize

        216KB

      • memory/1412-71-0x00000000079D0000-0x00000000079DA000-memory.dmp

        Filesize

        40KB

      • memory/1412-26-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/1412-70-0x0000000007960000-0x000000000797A000-memory.dmp

        Filesize

        104KB

      • memory/1412-68-0x0000000007660000-0x0000000007703000-memory.dmp

        Filesize

        652KB

      • memory/1412-28-0x0000000002D20000-0x0000000002D30000-memory.dmp

        Filesize

        64KB

      • memory/1412-57-0x0000000070130000-0x000000007017C000-memory.dmp

        Filesize

        304KB

      • memory/1412-76-0x0000000007CA0000-0x0000000007CBA000-memory.dmp

        Filesize

        104KB

      • memory/1412-73-0x0000000007B60000-0x0000000007B71000-memory.dmp

        Filesize

        68KB

      • memory/1412-74-0x0000000007B90000-0x0000000007B9E000-memory.dmp

        Filesize

        56KB

      • memory/1412-77-0x0000000007C80000-0x0000000007C88000-memory.dmp

        Filesize

        32KB

      • memory/1412-72-0x0000000007BE0000-0x0000000007C76000-memory.dmp

        Filesize

        600KB

      • memory/1412-67-0x0000000006C00000-0x0000000006C1E000-memory.dmp

        Filesize

        120KB

      • memory/1412-27-0x0000000002D20000-0x0000000002D30000-memory.dmp

        Filesize

        64KB

      • memory/1412-29-0x00000000057B0000-0x0000000005DD8000-memory.dmp

        Filesize

        6.2MB

      • memory/1412-50-0x00000000066A0000-0x00000000066EC000-memory.dmp

        Filesize

        304KB

      • memory/1412-56-0x0000000007620000-0x0000000007652000-memory.dmp

        Filesize

        200KB

      • memory/1412-36-0x0000000005610000-0x0000000005632000-memory.dmp

        Filesize

        136KB

      • memory/1412-54-0x0000000002D20000-0x0000000002D30000-memory.dmp

        Filesize

        64KB

      • memory/1412-80-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/1412-38-0x0000000005EE0000-0x0000000005F46000-memory.dmp

        Filesize

        408KB

      • memory/1412-48-0x0000000006070000-0x00000000063C4000-memory.dmp

        Filesize

        3.3MB

      • memory/1412-49-0x0000000006650000-0x000000000666E000-memory.dmp

        Filesize

        120KB

      • memory/1728-34-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/1728-84-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/1728-37-0x0000000005020000-0x0000000005030000-memory.dmp

        Filesize

        64KB

      • memory/1728-52-0x0000000006510000-0x000000000651A000-memory.dmp

        Filesize

        40KB

      • memory/1728-85-0x0000000005020000-0x0000000005030000-memory.dmp

        Filesize

        64KB

      • memory/2636-4-0x0000000005220000-0x00000000057C4000-memory.dmp

        Filesize

        5.6MB

      • memory/2636-2-0x0000000004A00000-0x0000000004A10000-memory.dmp

        Filesize

        64KB

      • memory/2636-0-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/2636-1-0x00000000000B0000-0x0000000000192000-memory.dmp

        Filesize

        904KB

      • memory/2636-3-0x0000000002500000-0x000000000250C000-memory.dmp

        Filesize

        48KB

      • memory/2636-5-0x0000000004B60000-0x0000000004BF2000-memory.dmp

        Filesize

        584KB

      • memory/2636-12-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/2636-6-0x0000000004C70000-0x0000000004D0C000-memory.dmp

        Filesize

        624KB

      • memory/2636-8-0x0000000004AC0000-0x0000000004ACA000-memory.dmp

        Filesize

        40KB

      • memory/4800-9-0x0000000000400000-0x000000000048C000-memory.dmp

        Filesize

        560KB

      • memory/4800-13-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/4800-53-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/4800-14-0x0000000005100000-0x0000000005110000-memory.dmp

        Filesize

        64KB

      • memory/4800-17-0x00000000068F0000-0x000000000692C000-memory.dmp

        Filesize

        240KB

      • memory/4800-15-0x0000000005550000-0x00000000055B6000-memory.dmp

        Filesize

        408KB

      • memory/4800-83-0x0000000074C90000-0x0000000075440000-memory.dmp

        Filesize

        7.7MB

      • memory/4800-16-0x0000000006370000-0x0000000006382000-memory.dmp

        Filesize

        72KB

      • memory/4800-55-0x0000000005100000-0x0000000005110000-memory.dmp

        Filesize

        64KB