Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20251231-en
  • resource tags

    arch:x64arch:x86image:win11-20251231-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    19/01/2026, 15:10

General

  • Target
    Overdue Invoices.exe
  • Size 479KB
  • Sample260119-sj9evafs2f
  • SHA256 ca56faca9cf660826fa63147d03bf21b1ea7221cee4c2fcd6e5bc49266176fef
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • formbook

Version
  • 4.1

Campaign
  • b25f

Decoy
  • cleverstonebridgeyc.pro

  • f6ef5tp.xyz

  • workwearmart.net

  • tnfihtl.live

  • brinaguide.online

  • antonkreil.com.cn

  • uthn579.xyz

  • a80pxi.com

  • travelmindedmasters.live

  • magmacreativehub.shop

  • kairoloma.com

  • gossipquality.live

  • everlastingvows.pro

  • restoration-experts.net

  • solestia-group.com

  • arur.us

  • christinahays.shop

  • eosbetting.xyz

  • aritza.net

  • kfn25i.top

Signatures

  • Formbook

    Formbook is a data stealing malware which is capable of stealing data.

  • Formbook family
  • Formbook payload 3 IoCs
  • Loads dropped DLL 2 IoCs
  • Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs

    Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

  • Drops file in System32 directory 1 IoCs
  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 56 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Windows\Explorer.EXE
    C:\Windows\Explorer.EXE
    1⤵
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3084
    • C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe
      "C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe"
      2⤵
      • Loads dropped DLL
      • Drops file in System32 directory
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of WriteProcessMemory
      PID:5936
      • C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe
        "C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe"
        3⤵
          PID:5996
        • C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe
          "C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe"
          3⤵
          • Suspicious use of NtCreateThreadExHideFromDebugger
          • Suspicious use of NtSetInformationThreadHideFromDebugger
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3372
          • C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe
            "C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe"
            4⤵
              PID:6076
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\SysWOW64\netsh.exe"
          2⤵
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:6088
          • C:\Windows\SysWOW64\cmd.exe
            /c del "C:\Users\Admin\AppData\Local\Temp\Overdue Invoices.exe"
            3⤵
            • System Location Discovery: System Language Discovery
            PID:6108

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            System.dll

            • Path C:\Users\Admin\AppData\Local\Temp\nsa9377.tmp\System.dll
            • Size 11KB
            • SHA256 ac9dfe3b35ea4b8932536ed7406c29a432976b685cc5322f94ef93df920fede7
            • MD5 SHA1 SHA512 SSDEEP TLSH

            nsa9378.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsa9378.tmp
            • Size 33B
            • SHA256 0ca259e86b73dc8d2f375e3860b6bf91b78b3680b5b90c262fdd82432492a77a
            • MD5 SHA1 SHA512

            nsa9378.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsa9378.tmp
            • Size 10B
            • SHA256 a7de06c22e4e67908840ec3f00ab8fe9e04ae94fb16a74136002afbaf607ff92
            • MD5 SHA1 SHA512

            nsa9378.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsa9378.tmp
            • Size 17B
            • SHA256 67e9b2f9ff46c1d3b647fd5df95b6014021dbcb74a2aa2f5e4fc99c733520545
            • MD5 SHA1 SHA512

            nsl95DB.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsl95DB.tmp
            • Size 1B
            • SHA256 8254c329a92850f6d539dd376f4816ee2764517da5e0235514af433164480d7a
            • MD5 SHA1 SHA512

            nsl95DB.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsl95DB.tmp
            • Size 2B
            • SHA256 8e5202705183bd3a20a29e224499b0f77a8273ee33cd93cca71043c57ad4bdfc
            • MD5 SHA1 SHA512

            nsl95DB.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsl95DB.tmp
            • Size 4B
            • SHA256 65e2d70166c9a802b7ad2a87129b8945f083e5f268878790a9d1f1c03f47938d
            • MD5 SHA1 SHA512

            nsl95DB.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsl95DB.tmp
            • Size 5B
            • SHA256 ff91566d755f5d038ae698a2cc0a7d4d14e5273afafc37b6f03afda163768fa0
            • MD5 SHA1 SHA512

            nsl95DB.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsl95DB.tmp
            • Size 7B
            • SHA256 639b68bd180b47d542dd001d03557ee2d5b3065c3c783143bc9fb548f3fd7713
            • MD5 SHA1 SHA512

            nsl95DB.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsl95DB.tmp
            • Size 9B
            • SHA256 ae789a65914ed002efb82dad89e5a4d4b9ec8e7faae30d0ed6e3c0d20f7d3858
            • MD5 SHA1 SHA512

            nsm9715.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsm9715.tmp
            • Size 3B
            • SHA256 01a219245e1501fee01ce0baea8f6065ce5162cea12fa570689a07c9717be81d
            • MD5 SHA1 SHA512

            nsm9715.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsm9715.tmp
            • Size 8B
            • SHA256 1c329924865741e0222d3ead23072cfbed14f96e2b0432573068eb0640513101
            • MD5 SHA1 SHA512

            nsq950F.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\nsq950F.tmp
            • Size 6B
            • SHA256 6923dd1bc0460082c5d55a831908c24a282860b7f1cd6c2b79cf1bc8857c639c
            • MD5 SHA1 SHA512

            sexchikane.lnk

            • Path C:\Windows\Fonts\sexchikane.lnk
            • Size 1KB
            • SHA256 c969a3ea5460d6b2ee98f03008c4d5aa318c3b2d7a423c170a9474cacbd91875
            • MD5 SHA1 SHA512 TLSH

            memory/3084-878-0x000000000F140000-0x000000000F2C8000-memory.dmp

            memory/3084-868-0x00000000057E0000-0x000000000593D000-memory.dmp

            memory/3372-865-0x0000000036990000-0x0000000036CE6000-memory.dmp

            memory/3372-867-0x0000000000400000-0x0000000001717000-memory.dmp

            memory/3372-850-0x000000007704B000-0x000000007704C000-memory.dmp

            memory/3372-863-0x0000000000400000-0x0000000001717000-memory.dmp

            memory/3372-864-0x0000000076F21000-0x0000000077043000-memory.dmp

            memory/3372-849-0x0000000076FB8000-0x0000000076FB9000-memory.dmp

            memory/3372-866-0x000000000041F000-0x0000000000420000-memory.dmp

            memory/3372-851-0x0000000076FCB000-0x0000000076FCC000-memory.dmp

            memory/3372-848-0x0000000000400000-0x0000000001717000-memory.dmp

            memory/3372-870-0x000000007704B000-0x000000007704C000-memory.dmp

            memory/3372-875-0x0000000076F21000-0x0000000077043000-memory.dmp

            memory/5936-847-0x0000000073CC4000-0x0000000073CC5000-memory.dmp

            memory/6088-871-0x0000000000C50000-0x0000000000C6E000-memory.dmp

            memory/6088-874-0x0000000000C50000-0x0000000000C6E000-memory.dmp

            memory/6088-876-0x0000000000B40000-0x0000000000B6F000-memory.dmp