Analysis

  • max time kernel
    14s
  • max time network
    151s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    03/08/2026, 13:39

General

  • Target
    Nota Fiscal Correio-FCS3TY.hta
  • Size 46KB
  • Sample260803-qx2wtazgpc
  • SHA256 261144f579fa466a48d4e9a01e9d62b8b72d367ddcd2ba4f4ae885d2759b9dea
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Badlisted process makes network request 4 IoCs

    Network request originating from process or tool commonly abused by malware.

  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 1 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Modifies Internet Explorer settings 1 TTPs 8 IoCs
  • Modifies registry class 20 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious use of FindShellTrayWindow 4 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Windows\SysWOW64\mshta.exe
    C:\Windows\SysWOW64\mshta.exe "C:\Users\Admin\AppData\Local\Temp\Nota Fiscal Correio-FCS3TY.hta" {1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}{1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}
    1⤵
    • Badlisted process makes network request
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5532
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 8
      2⤵
      • System Location Discovery: System Language Discovery
      • Modifies Internet Explorer settings
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      PID:540
      • C:\Windows\SysWOW64\rundll32.exe
        C:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:00000000
        3⤵
        • System Location Discovery: System Language Discovery
        • Modifies registry class
        PID:2852
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 8
      2⤵
      • System Location Discovery: System Language Discovery
      • Modifies Internet Explorer settings
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      PID:5696
      • C:\Windows\SysWOW64\rundll32.exe
        C:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:00000000
        3⤵
        • System Location Discovery: System Language Discovery
        • Modifies registry class
        PID:5936
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 8
      2⤵
      • System Location Discovery: System Language Discovery
      • Modifies Internet Explorer settings
      • Suspicious use of FindShellTrayWindow
      PID:5924
      • C:\Windows\SysWOW64\rundll32.exe
        C:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:00000000
        3⤵
          PID:2316
      • C:\Windows\SysWOW64\rundll32.exe
        "C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 8
        2⤵
        • System Location Discovery: System Language Discovery
        • Modifies Internet Explorer settings
        • Suspicious use of FindShellTrayWindow
        PID:988
        • C:\Windows\SysWOW64\rundll32.exe
          C:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:00000000
          3⤵
            PID:5756
        • C:\Windows\SysWOW64\attrib.exe
          "C:\Windows\System32\attrib.exe" +h +s "C:\opjsqnjs\"
          2⤵
          • Views/modifies file attributes
          PID:792
        • C:\opjsqnjs\opjsqnjs.exe
          "C:\opjsqnjs\opjsqnjs.exe" C:\opjsqnjs\opjsqnjs
          2⤵
            PID:2160
          • C:\Windows\SysWOW64\rundll32.exe
            "C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 8
            2⤵
              PID:3736
              • C:\Windows\SysWOW64\rundll32.exe
                C:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:00000000
                3⤵
                  PID:3288
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /c ping -n 300 -w 1000 127.0.0.1 >nul
                2⤵
                • Executes a command shell one-liner
                • System Network Configuration Discovery: Internet Connection Discovery
                PID:2616
                • C:\Windows\SysWOW64\PING.EXE
                  ping -n 300 -w 1000 127.0.0.1
                  3⤵
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Runs ping.exe
                  PID:2640

            Network

                  MITRE ATT&CK Enterprise v16

                  Replay Monitor

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                  Downloads

                  8B2B9A00839EED1DFDCCC3BFC2F5DF12

                  • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\8B2B9A00839EED1DFDCCC3BFC2F5DF12
                  • Size 1KB
                  • SHA256 63b14543360f5e89942ea8d5113526e64fbc71c1207328f0136b3a495d921dd0
                  • MD5 SHA1 SHA512 TLSH

                  B46811C17859FFB409CF0E904A4AA8F8

                  • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B46811C17859FFB409CF0E904A4AA8F8
                  • Size 528B
                  • SHA256 d2bb091268ade68ad8121d2184d0fbce128070156304bd4de312e6fbd267409c
                  • MD5 SHA1 SHA512 TLSH

                  D00881249E8ACE3C38D6E432A97CAF57

                  • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\D00881249E8ACE3C38D6E432A97CAF57
                  • Size 347B
                  • SHA256 460bbe332720d1fff79afd2f08073794e62e8475f148f47a50c31d07757002f3
                  • MD5 SHA1 SHA512 TLSH

                  8B2B9A00839EED1DFDCCC3BFC2F5DF12

                  • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\8B2B9A00839EED1DFDCCC3BFC2F5DF12
                  • Size 174B
                  • SHA256 7bcd4805774e1776fbd355af9d98f0ee6e189247c120143762e409f2b9d52032
                  • MD5 SHA1 SHA512 TLSH

                  B46811C17859FFB409CF0E904A4AA8F8

                  • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B46811C17859FFB409CF0E904A4AA8F8
                  • Size 170B
                  • SHA256 64f2e030b864c9d13b37caa4e7565eab286f2b7ad02e37261b19ea15a2a4c7f8
                  • MD5 SHA1 SHA512 TLSH

                  D00881249E8ACE3C38D6E432A97CAF57

                  • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\D00881249E8ACE3C38D6E432A97CAF57
                  • Size 192B
                  • SHA256 aca78dfb9acbaa2645c12dcc6c6bd67a0d40292cb73663de4f2865451b3426e3
                  • MD5 SHA1 SHA512 TLSH

                  a1.zip

                  • Path C:\opjsqnjs\a1.zip
                  • Size 494KB
                  • SHA256 8d0b09de9dbfbd58c859e04521a6354fe7e40d1ab78dac7bcc84e63a36dfbd10
                  • MD5 SHA1 SHA512 SSDEEP TLSH

                  a2.zip

                  • Path C:\opjsqnjs\a2.zip
                  • Size 1.3MB
                  • SHA256 0076f761e0f2ef3e0af272996869b6981ba0e2790871b818b42dcc2a6fcf0511
                  • MD5 SHA1 SHA512 SSDEEP TLSH

                  a3.zip

                  • Path C:\opjsqnjs\a3.zip
                  • Size 2KB
                  • SHA256 8a6922f66114c5dde8b66040b2f0e8e3c4f1fd628f130c6e80eddb1ed545cb27
                  • MD5 SHA1 SHA512 TLSH

                  opjsqnjs

                  • Path C:\opjsqnjs\opjsqnjs
                  • Size 1.3MB
                  • SHA256 c7f22abb4ddd7fdb324bf80faa5449654a899c22ffc5ab8d5988be10e4a51ea4
                  • MD5 SHA1 SHA512 SSDEEP TLSH

                  opjsqnjs.exe

                  • Path C:\opjsqnjs\opjsqnjs.exe
                  • Size 957KB
                  • SHA256 bdd2b7236a110b04c288380ad56e8d7909411da93eed2921301206de0cb0dda1
                  • MD5 SHA1 SHA512 SSDEEP TLSH

                  memory/2160-113-0x0000000006BE0000-0x0000000006DA8000-memory.dmp