Analysis

  • max time kernel
    2s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-12-2023 13:19

General

  • Target

    9f052ffa940763ede6b28dc1ebd4757e.exe

  • Size

    654KB

  • MD5

    9f052ffa940763ede6b28dc1ebd4757e

  • SHA1

    0a4f3e7f6a573c0fe321ebf46aee344e08a28e25

  • SHA256

    c2361c29db867d86c9f6d361b3d3394d0d847775ebcb84422c095369ccde5acd

  • SHA512

    ebc566c0794b9edd8a7373636c065e3d67ee0156b33969a30950116b984cad81c352d96290cf4607fec7d3c2bf2e7a1d87f6231db6543a74df26da63ff5cbbbc

  • SSDEEP

    12288:c6bJhnrd2Qsm/+/dnGz7O0Y244sMYcoFMVyMg+Yy1Wcwemn58GVuv:ckJhngpn9kNsMwbMgkK58guv

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.

  • Executes dropped EXE 3 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
  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe
    "C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4004
    • C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe
      "C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe"
      2⤵
      • Modifies Windows Defender Real-time Protection settings
      • Windows security modification
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4852
      • 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 behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3848
        • 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
          PID:4804
          • 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:5092
        • 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
          PID:4504
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Windows Update Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2492
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
          PID:4244
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
          3⤵
            PID:2560
            • C:\Windows\SysWOW64\cmd.exe
              C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
              4⤵
                PID:4792
            • C:\Windows\SysWOW64\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\dIklSIj0stBP.bat" "
              3⤵
                PID:4636
                • C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe
                  "C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe"
                  4⤵
                    PID:2900
                    • C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe
                      "C:\Users\Admin\AppData\Local\Temp\9f052ffa940763ede6b28dc1ebd4757e.exe"
                      5⤵
                        PID:2168
              • C:\Windows\SysWOW64\chcp.com
                chcp 65001
                1⤵
                  PID:2460
                • C:\Windows\SysWOW64\PING.EXE
                  ping -n 10 localhost
                  1⤵
                  • Runs ping.exe
                  PID:644

                Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\9f052ffa940763ede6b28dc1ebd4757e.exe.log

                  Filesize

                  507B

                  MD5

                  8cf94b5356be60247d331660005941ec

                  SHA1

                  fdedb361f40f22cb6a086c808fc0056d4e421131

                  SHA256

                  52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

                  SHA512

                  b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

                • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vg3l10d0.mx5.ps1

                  Filesize

                  60B

                  MD5

                  d17fe0a3f47be24a6453e9ef58c94641

                  SHA1

                  6ab83620379fc69f80c0242105ddffd7d98d5d9d

                  SHA256

                  96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

                  SHA512

                  5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

                • C:\Users\Admin\AppData\Local\Temp\dIklSIj0stBP.bat

                  Filesize

                  229B

                  MD5

                  bb11429741210327e7b085e404ef9365

                  SHA1

                  79eb0e104ec4abb7fe282c57c51965ceea2fad95

                  SHA256

                  bfda9f6f98369deb3a209755b8b37011fa70756fe38d10195f82d57b1afde2b7

                  SHA512

                  b6dd92690d77af8dfeb58e78636eee2795f68e5bb7a849d7490e9a8d0bc2c444d4d6a5ee5d7592de2cbb6ce5d24630a0f06564c0f72bea6e60b6231e30c3ba8e

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

                  Filesize

                  224KB

                  MD5

                  6ee37c840c2afe8e36df28ed586094c9

                  SHA1

                  5bf8335caa833640832a72ba03c97f7d51cdbf95

                  SHA256

                  b9ac91efe340806e793bf7e9557f8e3a1f027e092cb647dc35a177aca4ca3840

                  SHA512

                  01524d03a21a0a4c8a92a5d2ec1e977b1cef3dac9a6910f5590111c947dc0fef4adb76a1476c04129585794ea9ee353f7f5f4a2fd376cbdbb42c398246752040

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

                  Filesize

                  134KB

                  MD5

                  ea644d7ffbd9fa7ec94de8563670800b

                  SHA1

                  23854baf484570d35ead63728214c1f3d0ca2fee

                  SHA256

                  68393549a3118b97d70cecd8fff454b18a6d04072e0c1be8aaa7a7a67d01475b

                  SHA512

                  5cf81392be5053ad54f6bd86f9744a01a262e284e23aa26602f70347220aa672df30e8c32b66db384d1e1f0c50d4ea942f7ad0978c8af850214a6288e061320c

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

                  Filesize

                  121KB

                  MD5

                  f9a1e036d8c0e3724655506cfeb90c2a

                  SHA1

                  aa8f6af4564b4eefabc76c96f02595293f3413d4

                  SHA256

                  1947cf9075912881196c3edb2afaaeafbdfff87719f7d3128fdfa3d51ae72742

                  SHA512

                  00075e0b9cff8e6890b9f753ca393a18014f33395374534f02d78feb974b370972e745c2a2167be63cf5472fb6f6e9d9249a04d6050e516b37939e4f72dd29df

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

                  Filesize

                  64KB

                  MD5

                  40a7d50868a03c1eb75cb9d8fb3a5600

                  SHA1

                  e55fc6a9427674360420513033289a39bef7f4bb

                  SHA256

                  713f4fc4d911766b4120e35cf66c8097bf9654a0f22910b65bd05ee28fcadd2f

                  SHA512

                  e8263b907b5d52a9ac7cf8caae7efa8e6195b38213587bbbde4e36dd757e5d2fc72c751d15a4525b85bbf211307b9e206330f6fe551be12da140fd9c1a8b33ca

                • memory/2168-94-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/2168-93-0x0000000004F70000-0x0000000004F80000-memory.dmp

                  Filesize

                  64KB

                • memory/2168-92-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/2900-88-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/2900-89-0x0000000005690000-0x00000000056A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2900-91-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/3848-22-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/3848-33-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/3848-23-0x0000000001130000-0x0000000001140000-memory.dmp

                  Filesize

                  64KB

                • memory/4004-4-0x0000000004E30000-0x0000000004EC2000-memory.dmp

                  Filesize

                  584KB

                • memory/4004-3-0x00000000053E0000-0x0000000005984000-memory.dmp

                  Filesize

                  5.6MB

                • memory/4004-2-0x0000000004E20000-0x0000000004E30000-memory.dmp

                  Filesize

                  64KB

                • memory/4004-7-0x0000000004D40000-0x0000000004D4A000-memory.dmp

                  Filesize

                  40KB

                • memory/4004-12-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/4004-0-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/4004-1-0x00000000002D0000-0x000000000037A000-memory.dmp

                  Filesize

                  680KB

                • memory/4004-5-0x0000000004ED0000-0x0000000004F6C000-memory.dmp

                  Filesize

                  624KB

                • memory/4244-49-0x0000000006880000-0x000000000689E000-memory.dmp

                  Filesize

                  120KB

                • memory/4244-54-0x0000000007850000-0x0000000007882000-memory.dmp

                  Filesize

                  200KB

                • memory/4244-38-0x0000000006180000-0x00000000061E6000-memory.dmp

                  Filesize

                  408KB

                • memory/4244-24-0x00000000052E0000-0x0000000005316000-memory.dmp

                  Filesize

                  216KB

                • memory/4244-79-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/4244-32-0x0000000005420000-0x0000000005430000-memory.dmp

                  Filesize

                  64KB

                • memory/4244-36-0x00000000059B0000-0x00000000059D2000-memory.dmp

                  Filesize

                  136KB

                • memory/4244-50-0x00000000068A0000-0x00000000068EC000-memory.dmp

                  Filesize

                  304KB

                • memory/4244-35-0x0000000005420000-0x0000000005430000-memory.dmp

                  Filesize

                  64KB

                • memory/4244-28-0x0000000005A60000-0x0000000006088000-memory.dmp

                  Filesize

                  6.2MB

                • memory/4244-27-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/4244-74-0x0000000007DF0000-0x0000000007E04000-memory.dmp

                  Filesize

                  80KB

                • memory/4244-66-0x0000000005420000-0x0000000005430000-memory.dmp

                  Filesize

                  64KB

                • memory/4244-67-0x0000000007B10000-0x0000000007BB3000-memory.dmp

                  Filesize

                  652KB

                • memory/4244-65-0x0000000006E20000-0x0000000006E3E000-memory.dmp

                  Filesize

                  120KB

                • memory/4244-55-0x000000006FB70000-0x000000006FBBC000-memory.dmp

                  Filesize

                  304KB

                • memory/4244-69-0x0000000007BC0000-0x0000000007BDA000-memory.dmp

                  Filesize

                  104KB

                • memory/4244-68-0x0000000008240000-0x00000000088BA000-memory.dmp

                  Filesize

                  6.5MB

                • memory/4244-70-0x0000000007C20000-0x0000000007C2A000-memory.dmp

                  Filesize

                  40KB

                • memory/4244-44-0x0000000006270000-0x00000000065C4000-memory.dmp

                  Filesize

                  3.3MB

                • memory/4244-71-0x0000000007E30000-0x0000000007EC6000-memory.dmp

                  Filesize

                  600KB

                • memory/4244-53-0x000000007F7A0000-0x000000007F7B0000-memory.dmp

                  Filesize

                  64KB

                • memory/4244-72-0x0000000007DB0000-0x0000000007DC1000-memory.dmp

                  Filesize

                  68KB

                • memory/4244-73-0x0000000007DE0000-0x0000000007DEE000-memory.dmp

                  Filesize

                  56KB

                • memory/4244-75-0x0000000007EF0000-0x0000000007F0A000-memory.dmp

                  Filesize

                  104KB

                • memory/4244-76-0x0000000007ED0000-0x0000000007ED8000-memory.dmp

                  Filesize

                  32KB

                • memory/4804-34-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/4804-37-0x00000000056F0000-0x0000000005700000-memory.dmp

                  Filesize

                  64KB

                • memory/4804-81-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/4804-82-0x00000000056F0000-0x0000000005700000-memory.dmp

                  Filesize

                  64KB

                • memory/4804-52-0x0000000006EE0000-0x0000000006EEA000-memory.dmp

                  Filesize

                  40KB

                • memory/4852-80-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/4852-87-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB

                • memory/4852-16-0x0000000006AF0000-0x0000000006B2C000-memory.dmp

                  Filesize

                  240KB

                • memory/4852-15-0x0000000005DC0000-0x0000000005DD2000-memory.dmp

                  Filesize

                  72KB

                • memory/4852-14-0x0000000005850000-0x00000000058B6000-memory.dmp

                  Filesize

                  408KB

                • memory/4852-8-0x0000000000400000-0x000000000048C000-memory.dmp

                  Filesize

                  560KB

                • memory/4852-13-0x0000000003160000-0x0000000003170000-memory.dmp

                  Filesize

                  64KB

                • memory/4852-11-0x00000000746D0000-0x0000000074E80000-memory.dmp

                  Filesize

                  7.7MB