Resubmissions

02/02/2024, 14:39

240202-r1clrsafcl8

02/02/2024, 14:30

240202-rvnrvaaeak8

Analysis

  • max time kernel
    149s
  • max time network
    121s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02/02/2024, 14:31

General

  • Target
    89c0bdfb39c64d0509d80303243c8350.exe
  • Size 104KB
  • Sample240202-rvnrvaaeak
  • SHA256 7dc697c88737de722f28e6e767fb7b3c41a33a933678a3366d23806039545934
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Sets file to hidden 1 TTPs 1 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • ACProtect 1.3x - 1.4x DLL software 1 IoCs

    Detects file using ACProtect software.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Loads dropped DLL 1 IoCs
  • UPX packed file 2 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Installs/modifies Browser Helper Object 2 TTPs 5 IoCs

    BHOs are DLL modules which act as plugins for Internet Explorer.

  • Drops file in System32 directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 48 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\89c0bdfb39c64d0509d80303243c8350.exe
    "C:\Users\Admin\AppData\Local\Temp\89c0bdfb39c64d0509d80303243c8350.exe"
    1⤵
    • Checks computer location settings
    • Installs/modifies Browser Helper Object
    • Drops file in System32 directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4804
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c echo Y|cacls C:\Windows\system32\2211.dll /g everyone:f
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4676
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /S /D /c" echo Y"
        3⤵
          PID:4112
        • C:\Windows\SysWOW64\cacls.exe
          cacls C:\Windows\system32\2211.dll /g everyone:f
          3⤵
            PID:4640
        • C:\Windows\SysWOW64\attrib.exe
          "C:\Windows\System32\attrib.exe" -r -a -s -h C:\Windows\system32\2211.dll
          2⤵
          • Views/modifies file attributes
          PID:2780
        • C:\Windows\SysWOW64\attrib.exe
          "C:\Windows\System32\attrib.exe" +r +a +s +h C:\Windows\system32\2211.dll
          2⤵
          • Sets file to hidden
          • Drops file in System32 directory
          • Views/modifies file attributes
          PID:4116
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c echo Y|cacls C:\Windows\system32\2211.dll /g everyone:r
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:4472
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /S /D /c" echo Y"
            3⤵
              PID:848
            • C:\Windows\SysWOW64\cacls.exe
              cacls C:\Windows\system32\2211.dll /g everyone:r
              3⤵
                PID:900
            • C:\Windows\SysWOW64\cmd.exe
              cmd /c regsvr32 /s C:\Windows\system32\2211.dll
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:3356
              • C:\Windows\SysWOW64\regsvr32.exe
                regsvr32 /s C:\Windows\system32\2211.dll
                3⤵
                • Loads dropped DLL
                • Installs/modifies Browser Helper Object
                • Modifies registry class
                PID:3508

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                2211.dll

                • Path C:\Windows\SysWOW64\2211.dll
                • Size 16KB
                • SHA256 70e101e821c0d772e661839950260611bdccb2400db9e809bc24bb6736110f43
                • MD5 SHA1 SHA512 SSDEEP

                memory/3508-6-0x0000000010000000-0x000000001000D000-memory.dmp

                memory/4804-0-0x0000000000400000-0x000000000041A000-memory.dmp