Analysis

  • max time kernel
    150s
  • max time network
    103s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250502-en
  • resource tags

    arch:x64arch:x86image:win11-20250502-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    20/05/2025, 08:30

General

  • Target

    2025-05-20_a6706faee9b596ab1003002d11892d3a_black-basta_cobalt-strike_elex_luca-stealer.exe

  • Size

    796KB

  • MD5

    a6706faee9b596ab1003002d11892d3a

  • SHA1

    c9e225ff5c85726cae2d6c18c8146b364dd09418

  • SHA256

    82b33a1aca5648e9b5ce944920cf3be5f5f9dac2c913d68a66d6d55240fc0606

  • SHA512

    f5963bf379932b99278e08bbada9346951caba78fa2dfcf3214c09dfa1857520b8fd599ae063fe4e3a6ba1c9615013b377b398ac416462ae938cbd807f33247c

  • SSDEEP

    12288:zENN+T5xYrllrU7QY6gubXcwafJcLln5QwnVWqqPIBONhxsU/E3:Z5xolYQY6gurP90r/xsU/E3

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 8 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 12 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 33 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2025-05-20_a6706faee9b596ab1003002d11892d3a_black-basta_cobalt-strike_elex_luca-stealer.exe
    "C:\Users\Admin\AppData\Local\Temp\2025-05-20_a6706faee9b596ab1003002d11892d3a_black-basta_cobalt-strike_elex_luca-stealer.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:5716
    • \??\c:\users\admin\appdata\local\temp\2025-05-20_a6706faee9b596ab1003002d11892d3a_black-basta_cobalt-strike_elex_luca-stealer.exe 
      c:\users\admin\appdata\local\temp\2025-05-20_a6706faee9b596ab1003002d11892d3a_black-basta_cobalt-strike_elex_luca-stealer.exe 
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:848
    • 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:5116
      • \??\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:5864
        • \??\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:5984
          • \??\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:4700
            • \??\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:4956
            • C:\Windows\SysWOW64\at.exe
              at 08:32 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
              • System Location Discovery: System Language Discovery
              PID:4916
            • C:\Windows\SysWOW64\at.exe
              at 08:33 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
              • System Location Discovery: System Language Discovery
              PID:3248
            • C:\Windows\SysWOW64\at.exe
              at 08:34 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
              • System Location Discovery: System Language Discovery
              PID:2764
  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c c:\windows\system\explorer.exe RO
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:5040
    • \??\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:3516
  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c c:\windows\system\svchost.exe RO
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:5052
    • \??\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:3768

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\2025-05-20_a6706faee9b596ab1003002d11892d3a_black-basta_cobalt-strike_elex_luca-stealer.exe 

          Filesize

          589KB

          MD5

          f8d95eb8c84c6de968a90496256180b1

          SHA1

          52ec2c2d0dfb4e0ee4cacf58c06308673caf7535

          SHA256

          d0fbb98b3de71b571276016743d1a2b56fc71b8708455a533a7489fdb64e63de

          SHA512

          0b2a33093ecab5307c496283bec5d8fcd40a53921b7f73ea643c2b43c712c6264337fc16f340c9021fa17f45a02e888c19b4d2a244f970376720416bbbfb883e

        • C:\Users\Admin\AppData\Local\Temp\log.txt

          Filesize

          4KB

          MD5

          2f17afdac3b6b12d045459de51bf23bf

          SHA1

          9833b18ad03775c8e0bfdd02edf070304da993f0

          SHA256

          84ad491dac9b752ecdd49ebdf0c616e7da8a404afb69979cccd27ce1fde0294d

          SHA512

          7a43abcffbb1f5ab7f69eb3b927c87973f271b4b9d999389cb20a1ec2388ad5c70ff0256ea2c9c42b8be27156e65b6ae2b1b4cfa197558d489a22ea137abc566

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

          Filesize

          207KB

          MD5

          e9a8033ab8de7db2b2e38a4660d28c0f

          SHA1

          4c19b54a5867cf510713290629d694e89ed1a577

          SHA256

          5501e7f08d4d015d7aa2bba6182714d67bc53cc303356db9ce1e296c8216d136

          SHA512

          24c18dbca8e9685e65be88a312fc6fdfaa98b2f19833bcc90344682b7825c88b62295f02c5efa890b80266f6675cfcd54150d17af014ef75be1b6a8baa1bbdff

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

          Filesize

          206KB

          MD5

          21e4a53dceb8b4d98163d6730cbdb46b

          SHA1

          bff408f2da489b9a4a42e010a5fe0ec29fa1d283

          SHA256

          72985246023aaebea36e14491ea8b4e25a4148d978efad60a1773131383f3763

          SHA512

          4e644815a9e9a14e9bae4087d41b8e7e9d2ca28f61784fb2dcbd63ebbd8f141409e6c22ced62672e424bf33fdbe9930d1ce65ba22cd2bf4199ef536e50d1f859

        • C:\Windows\System\spoolsv.exe

          Filesize

          206KB

          MD5

          fe5eebc29761e754cdaf703b2ad357f7

          SHA1

          3216f408c4cf825a5864bf31c284722b8ff8a5dd

          SHA256

          cb5f93a42663b918b8701c0c381d53e334013170fc27b9e36bdbaf3fe1014885

          SHA512

          c7ce981dc7621de0f58e50399d3cf7d84ef091025fa029e8a3d37ac16e48b04e8daf023e86bb55c6c0ea2780ab560b9891980dd8925c47cc0960b8dd0b758cb4

        • C:\Windows\System\svchost.exe

          Filesize

          206KB

          MD5

          52ed03044ce375edd527560cb0bcd48b

          SHA1

          31aa3afc8cf077dba701de0324d29e6fe6b8fa5f

          SHA256

          f3b34320a32110653b0986fc71f6f593824018289a402ac7e7aaf438ec511d7f

          SHA512

          e8f6164c7f6e1fa5130ef6545d3ad166091f240b2a1f640ba0666e55407e3895687034a8ce172c406f3a459292c522c34636fd6924d90834ecc192d115c6b135

        • \??\c:\windows\system\explorer.exe

          Filesize

          207KB

          MD5

          a9bd66f61f245d64dcbf1f11c20e4ea5

          SHA1

          5ef556521730cbb1dfb91be4546deee1cdbc43ca

          SHA256

          bfa43ec06fe362903dfe9cf069eaa373641002565dbf76cd1dbed21f1b3e5962

          SHA512

          f20ea78481e66c571abfc93509d4d3603f94bb1c1de39f80852c14a49bf176364c205c7b29e6658b55812658bbb3e26f9874618377181cd06420fca9e31ca0c6