Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240419-en
  • resource tags

    arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    27/04/2024, 20:28

General

  • Target

    CompatibilityCheck.exe

  • Size

    37KB

  • MD5

    0c84829a79c06e88510607526990391e

  • SHA1

    63970a42f5b779c1f0f8d95d493317917b0bd46d

  • SHA256

    6f9b61794c9169a8860fb74e2cc0253b0bc283327b6485f799265f702a67c921

  • SHA512

    85638191fee2b456e601487aff23bc5dccbfd24e74970e5f1d8fbdad633a3d31208887f682debf1fd2abcec6e36c50e74b6da30c660dfa0bc0471e7ef8c98f40

  • SSDEEP

    384:p6hCpb2iKrL4y4Oo49qylTKbWstSXHasW4TkrAF+rMRTyN/0L+EcoinblneHQM3Y:oCdi/s89ZlTKtSK94YrM+rMRa8NuS2t

Score
8/10

Malware Config

Signatures

  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Drops startup file 2 IoCs
  • Executes dropped EXE 3 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops autorun.inf file 1 TTPs 5 IoCs

    Malware can abuse Windows Autorun to spread further via attached volumes.

  • Enumerates physical storage devices 1 TTPs

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

  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 36 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\CompatibilityCheck.exe
    "C:\Users\Admin\AppData\Local\Temp\CompatibilityCheck.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4240
    • C:\ProgramData\COM Surrogate.exe
      "C:\ProgramData\COM Surrogate.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops autorun.inf file
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2260
      • C:\Windows\SysWOW64\netsh.exe
        netsh firewall add allowedprogram "C:\ProgramData\COM Surrogate.exe" "COM Surrogate.exe" ENABLE
        3⤵
        • Modifies Windows Firewall
        PID:3376
      • C:\Windows\SysWOW64\taskkill.exe
        taskkill /F /IM SecHealthUI.exe
        3⤵
        • Kills process with taskkill
        • Suspicious use of AdjustPrivilegeToken
        PID:1284
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:3136
    • C:\svchost.exe
      "C:\svchost.exe"
      1⤵
      • Executes dropped EXE
      PID:1144
    • C:\svchost.exe
      "C:\svchost.exe"
      1⤵
      • Executes dropped EXE
      PID:3240

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\ProgramData\COM Surrogate.exe

      Filesize

      37KB

      MD5

      0c84829a79c06e88510607526990391e

      SHA1

      63970a42f5b779c1f0f8d95d493317917b0bd46d

      SHA256

      6f9b61794c9169a8860fb74e2cc0253b0bc283327b6485f799265f702a67c921

      SHA512

      85638191fee2b456e601487aff23bc5dccbfd24e74970e5f1d8fbdad633a3d31208887f682debf1fd2abcec6e36c50e74b6da30c660dfa0bc0471e7ef8c98f40

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v2.0_32\UsageLogs\svchost.exe.log

      Filesize

      319B

      MD5

      2a0834560ed3770fc33d7a42f8229722

      SHA1

      c8c85f989e7a216211cf9e4ce90b0cc95354aa53

      SHA256

      8aa2d836004258f1a1195dc4a96215b685aed0c46a261a2860625d424e9402b6

      SHA512

      c5b64d84e57eb8cc387b5feedf7719f1f7ae21f6197169f5f73bc86deddb538b9af3c9952c94c4f69ae956e1656d11ab7441c292d2d850a4d2aaa9ec678f8e82

    • memory/2260-14-0x0000000001B00000-0x0000000001B10000-memory.dmp

      Filesize

      64KB

    • memory/2260-13-0x0000000074E00000-0x00000000753B1000-memory.dmp

      Filesize

      5.7MB

    • memory/2260-24-0x0000000074E00000-0x00000000753B1000-memory.dmp

      Filesize

      5.7MB

    • memory/2260-25-0x0000000001B00000-0x0000000001B10000-memory.dmp

      Filesize

      64KB

    • memory/4240-0-0x0000000074E00000-0x00000000753B1000-memory.dmp

      Filesize

      5.7MB

    • memory/4240-1-0x0000000074E00000-0x00000000753B1000-memory.dmp

      Filesize

      5.7MB

    • memory/4240-2-0x0000000001290000-0x00000000012A0000-memory.dmp

      Filesize

      64KB

    • memory/4240-12-0x0000000074E00000-0x00000000753B1000-memory.dmp

      Filesize

      5.7MB