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Analysis

  • max time kernel
    102s
  • max time network
    30s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    14/02/2023, 19:29

General

  • Target

    26c90443762f147189330196a7f37a55.xlsb

  • Size

    83KB

  • MD5

    26c90443762f147189330196a7f37a55

  • SHA1

    f7f0e47df27cd6c99096ab9f4baeb1041dfe0c41

  • SHA256

    28e0ffe67dd62f679523af17fd8031d2d92a46577effe12f7027c5c5595f8fc5

  • SHA512

    8ae802e9fb065bf8740f33efd1794b28bb98ba3a9b0d78708fa54a4526f90bfe6f4c9f19d17983807bf74c6df0d5c9a6f6a2a9a6b92db692f741291b129944f2

  • SSDEEP

    1536:kU/wRbzYC/DoH//O4Ai4nk4i5gqbxFRWs1yeq3++K8EmA9Z:kUybzY7nHJ4klFTWKy9++K8E

Score
10/10

Malware Config

Signatures

  • Process spawned unexpected child process 3 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • Suspicious Office macro 2 IoCs

    Office document equipped with 4.0 macros.

  • Deletes itself 1 IoCs
  • Office loads VBA resources, possible macro or embedded object present
  • Enumerates system info in registry 2 TTPs 1 IoCs
  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • NTFS ADS 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: RenamesItself 1 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\26c90443762f147189330196a7f37a55.xlsb
    1⤵
    • Deletes itself
    • Enumerates system info in registry
    • Modifies Internet Explorer settings
    • Modifies registry class
    • NTFS ADS
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: RenamesItself
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2008
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c attrib -S -h "C:\Users\Admin\AppData\Roaming\Microsoft\Excel\XLSTART\K4.XLS"
      2⤵
      • Process spawned unexpected child process
      • Suspicious use of WriteProcessMemory
      PID:1520
      • C:\Windows\SysWOW64\attrib.exe
        attrib -S -h "C:\Users\Admin\AppData\Roaming\Microsoft\Excel\XLSTART\K4.XLS"
        3⤵
        • Views/modifies file attributes
        PID:1976
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c Del /F /Q "C:\Users\Admin\AppData\Roaming\Microsoft\Excel\XLSTART\K4.XLS"
      2⤵
      • Process spawned unexpected child process
      PID:580
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c RD /S /Q "C:\Users\Admin\AppData\Roaming\Microsoft\Excel\XLSTART\K4.XLS"
      2⤵
      • Process spawned unexpected child process
      PID:1296

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\Microsoft\Excel\XLSTART\k4.xls

    Filesize

    85KB

    MD5

    0ab05abbcd3c0481cb7e5df33ed193a3

    SHA1

    6160d2fbba82d095eb385da710bbfde863049da7

    SHA256

    e7267cef8b32278b06a12fe95a60e9d616eb89ae1e36b8d82914c30f754e3093

    SHA512

    e17013bb3d4966a452d2b56c4bf07917db71e0489be51dec87c10eaa0f80e554b1d1390d0cff34ed0d8939d2d6237959e513ef73f96136969dcff969a00fa377

  • memory/2008-56-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/2008-57-0x00000000753D1000-0x00000000753D3000-memory.dmp

    Filesize

    8KB

  • memory/2008-58-0x000000007237D000-0x0000000072388000-memory.dmp

    Filesize

    44KB

  • memory/2008-54-0x000000002F261000-0x000000002F264000-memory.dmp

    Filesize

    12KB

  • memory/2008-55-0x0000000071391000-0x0000000071393000-memory.dmp

    Filesize

    8KB

  • memory/2008-70-0x000000007237D000-0x0000000072388000-memory.dmp

    Filesize

    44KB

  • memory/2008-71-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/2008-72-0x000000007237D000-0x0000000072388000-memory.dmp

    Filesize

    44KB