Analysis

  • max time kernel
    131s
  • max time network
    71s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    23-11-2022 14:39

General

  • Target

    C913990AF3B4C953A37E91C3797A17392E1604D5D34F13B8CD03641EB243F740.rtf

  • Size

    26KB

  • MD5

    b0407fbb818bd9c67348f4a9e52e878d

  • SHA1

    dbaafd96ec1bfc9c682655ad82f91cf743a723f9

  • SHA256

    c913990af3b4c953a37e91c3797a17392e1604d5d34f13b8cd03641eb243f740

  • SHA512

    9ba5e5d107c0116c18b7404f4f6992b5f354fb860db7c1fb3a72b2edb050eb0778a2da6f0244c6efd7cd6b1fb1c315df095789bc1e3439a0bd90ecf0e1baa473

  • SSDEEP

    768:nFx0XaIsnPRIa4fwJMeLvgKBCcR4lsu00dFd:nf0Xvx3EMeLvgK5Asu0cD

Score
8/10

Malware Config

Signatures

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

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

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

  • Office loads VBA resources, possible macro or embedded object present
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\C913990AF3B4C953A37E91C3797A17392E1604D5D34F13B8CD03641EB243F740.rtf"
    1⤵
    • Drops file in Windows directory
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1488
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      2⤵
        PID:1376
    • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
      "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
      1⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Launches Equation Editor
      • Suspicious use of WriteProcessMemory
      PID:1468
      • C:\Users\Admin\AppData\Roaming\samuelneyhf8i542.exe
        "C:\Users\Admin\AppData\Roaming\samuelneyhf8i542.exe"
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Drops file in Windows directory
        PID:1848

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Roaming\samuelneyhf8i542.exe

      Filesize

      188KB

      MD5

      2af941337bcd503df74b5e8aaaf06141

      SHA1

      e53d89eef562d2e2766310ddb6c7b58c3159fe9b

      SHA256

      ba6c343f813d13870c4d811459585f76c678c71fb32a24b3c13f6a26fa8d28e0

      SHA512

      a257e62c8e9d6e65c2356dbaa1abf993ae1cbfe1c8d8f8654a5f631d323c3ebd0a693f7f9f3b60dffbf47fd29240a6a13c5d44d5223c1ad16cb2796db14eac16

    • C:\Users\Admin\AppData\Roaming\samuelneyhf8i542.exe

      Filesize

      188KB

      MD5

      2af941337bcd503df74b5e8aaaf06141

      SHA1

      e53d89eef562d2e2766310ddb6c7b58c3159fe9b

      SHA256

      ba6c343f813d13870c4d811459585f76c678c71fb32a24b3c13f6a26fa8d28e0

      SHA512

      a257e62c8e9d6e65c2356dbaa1abf993ae1cbfe1c8d8f8654a5f631d323c3ebd0a693f7f9f3b60dffbf47fd29240a6a13c5d44d5223c1ad16cb2796db14eac16

    • \Users\Admin\AppData\Local\Temp\nsz3F45.tmp\System.dll

      Filesize

      12KB

      MD5

      8cf2ac271d7679b1d68eefc1ae0c5618

      SHA1

      7cc1caaa747ee16dc894a600a4256f64fa65a9b8

      SHA256

      6950991102462d84fdc0e3b0ae30c95af8c192f77ce3d78e8d54e6b22f7c09ba

      SHA512

      ce828fb9ecd7655cc4c974f78f209d3326ba71ced60171a45a437fc3fff3bd0d69a0997adaca29265c7b5419bdea2b17f8cc8ceae1b8ce6b22b7ed9120bb5ad3

    • \Users\Admin\AppData\Roaming\samuelneyhf8i542.exe

      Filesize

      188KB

      MD5

      2af941337bcd503df74b5e8aaaf06141

      SHA1

      e53d89eef562d2e2766310ddb6c7b58c3159fe9b

      SHA256

      ba6c343f813d13870c4d811459585f76c678c71fb32a24b3c13f6a26fa8d28e0

      SHA512

      a257e62c8e9d6e65c2356dbaa1abf993ae1cbfe1c8d8f8654a5f631d323c3ebd0a693f7f9f3b60dffbf47fd29240a6a13c5d44d5223c1ad16cb2796db14eac16

    • memory/1376-72-0x000007FEFC001000-0x000007FEFC003000-memory.dmp

      Filesize

      8KB

    • memory/1376-71-0x0000000000000000-mapping.dmp

    • memory/1488-58-0x0000000075AD1000-0x0000000075AD3000-memory.dmp

      Filesize

      8KB

    • memory/1488-59-0x000000007155D000-0x0000000071568000-memory.dmp

      Filesize

      44KB

    • memory/1488-54-0x0000000072AF1000-0x0000000072AF4000-memory.dmp

      Filesize

      12KB

    • memory/1488-57-0x000000007155D000-0x0000000071568000-memory.dmp

      Filesize

      44KB

    • memory/1488-67-0x000000006BAF1000-0x000000006BAF3000-memory.dmp

      Filesize

      8KB

    • memory/1488-69-0x000000006B971000-0x000000006B973000-memory.dmp

      Filesize

      8KB

    • memory/1488-56-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/1488-55-0x0000000070571000-0x0000000070573000-memory.dmp

      Filesize

      8KB

    • memory/1488-73-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/1488-74-0x000000007155D000-0x0000000071568000-memory.dmp

      Filesize

      44KB

    • memory/1848-62-0x0000000000000000-mapping.dmp

    • memory/1848-68-0x0000000002E50000-0x0000000002FAC000-memory.dmp

      Filesize

      1.4MB

    • memory/1848-70-0x0000000002E50000-0x0000000002FAC000-memory.dmp

      Filesize

      1.4MB