Resubmissions

13/02/2026, 04:10

260213-ervd1aaz9f10

13/02/2026, 01:39

260213-b25qyafx5a10

13/02/2026, 00:59

260213-bb2llae17c10

Analysis

  • user interaction
    yes
  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260130-en
  • resource tags

    arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    13/02/2026, 04:10

General

  • Target
    Jigsaw.exe
  • Size 283KB
  • Sample260213-ervd1aaz9f
  • SHA256 3ae96f73d805e1d3995253db4d910300d8442ea603737a1428b613061e7f61e7
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Jigsaw Ransomware

    Ransomware family first created in 2016. Named based on wallpaper set after infection in the early versions.

  • Jigsaw family
  • Renames multiple (1736) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 2 IoCs
  • ConfuserEx .NET packer 1 IoCs

    Detects ConfuserEx .NET packer.

  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 4 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Jigsaw.exe
    "C:\Users\Admin\AppData\Local\Temp\Jigsaw.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:3804
    • C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe
      "C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe" C:\Users\Admin\AppData\Local\Temp\Jigsaw.exe
      2⤵
      • Executes dropped EXE
      • Drops file in Program Files directory
      PID:5412
  • C:\Users\Admin\AppData\Roaming\Frfx\firefox.exe
    C:\Users\Admin\AppData\Roaming\Frfx\firefox.exe
    1⤵
    • Executes dropped EXE
    • Adds Run key to start application
    • Drops file in Program Files directory
    PID:4780
  • C:\Program Files\Mozilla Firefox\firefox.exe
    "C:\Program Files\Mozilla Firefox\firefox.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2468
    • C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe"
      2⤵
      • Checks processor information in registry
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:572
      • C:\Program Files\Mozilla Firefox\firefox.exe
        "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 2596 -prefsLen 24441 -prefMapHandle 2600 -prefMapSize 266443 -ipcHandle 2672 -initialChannelId {73393e31-a818-45cc-86c5-832395e34a2e} -parentPid 572 -crashReporter "\\.\pipe\gecko-crash-server-pipe.572" -appDir "C:\Program Files\Mozilla Firefox\browser" - 1 gpu
        3⤵
          PID:1608
        • C:\Program Files\Mozilla Firefox\firefox.exe
          "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 2908 -prefsLen 24441 -prefMapHandle 2912 -prefMapSize 266443 -ipcHandle 2932 -initialChannelId {e241175d-e81c-40b5-8e0f-1fd5cae125e9} -parentPid 572 -crashReporter "\\.\pipe\gecko-crash-server-pipe.572" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 2 socket
          3⤵
            PID:5000
          • C:\Program Files\Mozilla Firefox\firefox.exe
            "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 2156 -prefsLen 24758 -prefMapHandle 2132 -prefMapSize 266443 -jsInitHandle 2136 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 2028 -initialChannelId {4ad59bab-8459-4ce6-b1bf-903ec73580b6} -parentPid 572 -crashReporter "\\.\pipe\gecko-crash-server-pipe.572" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 3 tab
            3⤵
              PID:3912
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 3736 -prefsLen 25770 -prefMapHandle 3740 -prefMapSize 266443 -ipcHandle 3808 -initialChannelId {317ad5d2-cc17-4131-bb34-d4e1debaeff9} -parentPid 572 -crashReporter "\\.\pipe\gecko-crash-server-pipe.572" -appDir "C:\Program Files\Mozilla Firefox\browser" - 4 rdd
              3⤵
                PID:5420
              • C:\Program Files\Mozilla Firefox\firefox.exe
                "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 4144 -prefsLen 25835 -prefMapHandle 4148 -prefMapSize 266443 -jsInitHandle 4152 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 4160 -initialChannelId {d2af3328-9680-456e-87ce-2e3f69be10c9} -parentPid 572 -crashReporter "\\.\pipe\gecko-crash-server-pipe.572" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 5 tab
                3⤵
                  PID:4888
                • C:\Program Files\Mozilla Firefox\firefox.exe
                  "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 4680 -prefsLen 26241 -prefMapHandle 4684 -prefMapSize 266443 -jsInitHandle 4688 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 4696 -initialChannelId {a043b3d7-34bb-4634-abd0-7b87a32b1606} -parentPid 572 -crashReporter "\\.\pipe\gecko-crash-server-pipe.572" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 6 tab
                  3⤵
                    PID:3496

              Network

                    MITRE ATT&CK Enterprise v16

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

                    DisplayLanguageNames.en_US_POSIX.txt.fun

                    • Path C:\Program Files (x86)\Common Files\Adobe\Reader\DC\Linguistics\LanguageNames2\DisplayLanguageNames.en_US_POSIX.txt.fun
                    • Size 32KB
                    • SHA256 a193ee2673e0ba5ebc5ea6e65665b8a28bd7611f06d2b0174ec2076e22d94356
                    • MD5 SHA1 SHA512 SSDEEP TLSH

                    invalid32x32.gif.fun

                    • Path C:\Program Files\Java\jdk-1.8\jre\lib\images\cursors\invalid32x32.gif.fun
                    • Size 160B
                    • SHA256 98b6c2ddfefc628d03ceaef9d69688674a6bc32eb707f9ed86bc8c75675c4513
                    • MD5 SHA1 SHA512 TLSH

                    drpbx.exe

                    • Path C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe
                    • Size 283KB
                    • SHA256 3ae96f73d805e1d3995253db4d910300d8442ea603737a1428b613061e7f61e7
                    • MD5 SHA1 SHA512 SSDEEP TLSH

                    settings.dat.fun

                    • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.AccountsControl_cw5n1h2txyewy\Settings\settings.dat.fun
                    • Size 8KB
                    • SHA256 36537e56d60910ab6aa548e64ca4adafdcabde9d60739013993e12ba061dfd65
                    • MD5 SHA1 SHA512 SSDEEP TLSH

                    BroadcastMsg_1769753915.txt.fun

                    • Path C:\Users\Admin\AppData\Local\Temp\BroadcastMsg_1769753915.txt.fun
                    • Size 16B
                    • SHA256 619e246fc0ac11320ff9e322a979948d949494b0c18217f4d794e1b398818880
                    • MD5 SHA1 SHA512

                    prefs.js

                    • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\x9zyrz34.default-release\prefs.js
                    • Size 2KB
                    • SHA256 7ba5e13b12174680e85162b07d70aa6760b5aed089b0d9d5a85ebf8ec58c19a3
                    • MD5 SHA1 SHA512 TLSH

                    memory/3804-8-0x00007FF998740000-0x00007FF9990E1000-memory.dmp

                    memory/3804-9-0x00007FF998740000-0x00007FF9990E1000-memory.dmp

                    memory/3804-0-0x00007FF9989F5000-0x00007FF9989F6000-memory.dmp

                    memory/3804-21-0x00007FF998740000-0x00007FF9990E1000-memory.dmp

                    memory/3804-5-0x000000001BD80000-0x000000001BE1C000-memory.dmp

                    memory/3804-4-0x000000001B810000-0x000000001BCDE000-memory.dmp

                    memory/3804-3-0x00007FF998740000-0x00007FF9990E1000-memory.dmp

                    memory/3804-2-0x0000000000D60000-0x0000000000D98000-memory.dmp

                    memory/3804-1-0x00007FF998740000-0x00007FF9990E1000-memory.dmp

                    memory/4780-264-0x00007FF998740000-0x00007FF9990E1000-memory.dmp

                    memory/4780-262-0x000000001BF30000-0x000000001BF3C000-memory.dmp

                    memory/4780-26-0x00007FF998740000-0x00007FF9990E1000-memory.dmp

                    memory/4780-25-0x0000000000D70000-0x0000000000D78000-memory.dmp

                    memory/5412-265-0x0000000001090000-0x000000000109C000-memory.dmp

                    memory/5412-263-0x00007FF998740000-0x00007FF9990E1000-memory.dmp

                    memory/5412-22-0x00007FF998740000-0x00007FF9990E1000-memory.dmp