Analysis

  • max time kernel
    150s
  • max time network
    135s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250502-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250502-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/05/2025, 17:13

General

  • Target

    Icon.KillKnightIcon.exe

  • Size

    223KB

  • MD5

    196e4118ca8fefc65c37ddb40a8583af

  • SHA1

    0d7bdea1087a654e3c7bbbb5d4da85b72af4ff36

  • SHA256

    630528e76c576b0561744ebd5032a522f162eace1f646984d1239bca1da5d850

  • SHA512

    21dea2196877a728ed32d2031db238d34a24adad1db8f2af435ea4c949bebfe02eca301d0c3111667f39199658f06f8ad391f78e4646cd869f2674d5b118eb9a

  • SSDEEP

    3072:zvEfVUzSLhIVbV6i5LirrlZrHyrUHUckoMQ2RN6un2ByE3j:zvEN2U+T6i5LirrllHy4HUcMQY6dBHj

Malware Config

Signatures

  • Detects Mofksys worm 5 IoCs
  • Modifies WinLogon for persistence 2 TTPs 2 IoCs
  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs
  • Mofksys

    Mofksys is a worm written in VisualBasic.

  • Mofksys family
  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 8 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

  • Executes dropped EXE 7 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Drops file in Windows directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 11 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of SetWindowsHookEx 18 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Icon.KillKnightIcon.exe
    "C:\Users\Admin\AppData\Local\Temp\Icon.KillKnightIcon.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:5328
    • C:\Users\Admin\AppData\Local\icsys.icn.exe
      C:\Users\Admin\AppData\Local\icsys.icn.exe
      2⤵
      • Executes dropped EXE
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:5344
      • \??\c:\windows\system\explorer.exe
        c:\windows\system\explorer.exe
        3⤵
        • Modifies WinLogon for persistence
        • Modifies visiblity of hidden/system files in Explorer
        • Boot or Logon Autostart Execution: Active Setup
        • Executes dropped EXE
        • Adds Run key to start application
        • Drops file in Windows directory
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:3440
        • \??\c:\windows\system\spoolsv.exe
          c:\windows\system\spoolsv.exe SE
          4⤵
          • Executes dropped EXE
          • Drops file in Windows directory
          • System Location Discovery: System Language Discovery
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:4636
          • \??\c:\windows\system\svchost.exe
            c:\windows\system\svchost.exe
            5⤵
            • Modifies WinLogon for persistence
            • Modifies visiblity of hidden/system files in Explorer
            • Boot or Logon Autostart Execution: Active Setup
            • Executes dropped EXE
            • Adds Run key to start application
            • Drops file in Windows directory
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:5252
            • \??\c:\windows\system\spoolsv.exe
              c:\windows\system\spoolsv.exe PR
              6⤵
              • Executes dropped EXE
              • System Location Discovery: System Language Discovery
              • Suspicious use of SetWindowsHookEx
              PID:1988
            • C:\Windows\SysWOW64\at.exe
              at 17:15 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
              • System Location Discovery: System Language Discovery
              PID:5656
            • C:\Windows\SysWOW64\at.exe
              at 17:16 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
              • System Location Discovery: System Language Discovery
              PID:5076
            • C:\Windows\SysWOW64\at.exe
              at 17:17 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
              • System Location Discovery: System Language Discovery
              PID:5772
  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c c:\windows\system\svchost.exe RO
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2768
    • \??\c:\windows\system\svchost.exe
      c:\windows\system\svchost.exe RO
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of SetWindowsHookEx
      PID:6040
  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c c:\windows\system\explorer.exe RO
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:5492
    • \??\c:\windows\system\explorer.exe
      c:\windows\system\explorer.exe RO
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of SetWindowsHookEx
      PID:3568

Network

        MITRE ATT&CK Enterprise v16

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        Downloads

        • C:\Users\Admin\AppData\Local\icsys.icn.exe

          Filesize

          206KB

          MD5

          12c55be0ea22f3ba4baec6ae411a47d9

          SHA1

          c83dd8a82f865a93b4a542279603ee4e04faf934

          SHA256

          43daea4432fe6359bca327a20d232a1905211a08f71bd8bb62a3bce260a7f481

          SHA512

          41b334e06bf3ef0f6d72b3afad2d61d99ff356bea5c14a265e44c78aab2fb04929bfbe279096d3ad591f8d0597b26e81cb8c0358bb3cda58865d1aa6919b815a

        • C:\Users\Admin\AppData\Roaming\mrsys.exe

          Filesize

          206KB

          MD5

          b3cbaec8e6f214deb68bb487ed0e69c8

          SHA1

          d54c2cd1f1bc569c385ed2d6186f99ecd12e7989

          SHA256

          2d61a81a61304700a80360616ea97a29a64fd866f4d7db3b66b8fe4a6b3a2d6f

          SHA512

          63223269f456fa442e26afdbcab363795b9916fa3cdcc00796e21028d87c2ad7dd2689fc241b9fda27210fc5ca04a72cb8ff58b6e251371b2e4be0ca668e7426

        • C:\Windows\System\explorer.exe

          Filesize

          206KB

          MD5

          9b224d83db112af21ac4a76d681513db

          SHA1

          3ff56bf22de969adb1d0e76e538340063dcd3d34

          SHA256

          9ea9ff4550493d8ce140df03e3df13f743eb9faeb04a06fcd49061cc595967fd

          SHA512

          b0d0557a465976a37b602fa630200f40d9c35a58764777fbcd46fca9455301f849a91173f24e592ca2db6c2f5efcb432af218b2a83335a08f20398959ce8b780

        • C:\Windows\System\spoolsv.exe

          Filesize

          206KB

          MD5

          91746e808a0aedfcbd3648ad4a7eb95b

          SHA1

          7b9a7d75a5ed25d795c0c5ff820e8e908a1b89ee

          SHA256

          0f963c1128be4dc8154bd8e7ae24cf8fc562bb4c5f0b8bdb3b9b75c9f168f4f7

          SHA512

          0fe9cf9d93395d68e999934edb5e8f0ce612ae0a0c92ae387aa8eba6a003f66dbdc6ed12aea3e6d8c23573b8acef26d5de493d580b524ad593fcf9d7b6572445

        • C:\Windows\System\svchost.exe

          Filesize

          206KB

          MD5

          2b37295a4a5027eff805c581aa1a1011

          SHA1

          51c9418c5a747ef4a8b1d2858a5a90e8608064b4

          SHA256

          f1015e7c31a22b90b1edca2a0302348a662aff4d2f80f000a724119f2171186e

          SHA512

          041bd2de12f805df828e91c9a3e78fc82ca1a09364d01e752a1f4a65d3cac4d4675a36e988af0d17db2a7f58fdf126f1793af9e0ca21d0397db3492b2b7afe0a