Analysis

  • max time kernel
    144s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/04/2024, 13:32

General

  • Target
    9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe
  • Size 233KB
  • Sample240417-qtexwabc4t
  • SHA256 9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • vanaheim.cn

  • jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe
    "C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3488
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jvvrmmud\
      2⤵
        PID:1588
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hwovaydv.exe" C:\Windows\SysWOW64\jvvrmmud\
        2⤵
          PID:3972
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jvvrmmud binPath= "C:\Windows\SysWOW64\jvvrmmud\hwovaydv.exe /d\"C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jvvrmmud "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4676
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jvvrmmud
          2⤵
          • Launches sc.exe
          PID:1388
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:664
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3488 -s 1176
          2⤵
          • Program crash
          PID:4272
      • C:\Windows\SysWOW64\jvvrmmud\hwovaydv.exe
        C:\Windows\SysWOW64\jvvrmmud\hwovaydv.exe /d"C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3528
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:684
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3528 -s 532
          2⤵
          • Program crash
          PID:4932
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3488 -ip 3488
        1⤵
          PID:5100
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3528 -ip 3528
          1⤵
            PID:2132
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1424 --field-trial-handle=2180,i,12780723798465539942,12010519452607841069,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:1860

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  hwovaydv.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\hwovaydv.exe
                  • Size 14.6MB
                  • SHA256 238f59054f2ce4f76c2b8b5359ccccbdb2cbf16a2bc14a0e653f9bcff171be7a
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/684-14-0x0000000000700000-0x0000000000715000-memory.dmp

                  memory/684-24-0x0000000000700000-0x0000000000715000-memory.dmp

                  memory/684-21-0x0000000000700000-0x0000000000715000-memory.dmp

                  memory/684-18-0x0000000000700000-0x0000000000715000-memory.dmp

                  memory/684-22-0x0000000000700000-0x0000000000715000-memory.dmp

                  memory/3488-3-0x0000000000400000-0x000000000043F000-memory.dmp

                  memory/3488-5-0x0000000000400000-0x000000000043F000-memory.dmp

                  memory/3488-7-0x0000000000500000-0x0000000000600000-memory.dmp

                  memory/3488-8-0x0000000002180000-0x0000000002193000-memory.dmp

                  memory/3488-2-0x0000000002180000-0x0000000002193000-memory.dmp

                  memory/3488-1-0x0000000000500000-0x0000000000600000-memory.dmp

                  memory/3488-17-0x0000000000400000-0x000000000043F000-memory.dmp

                  memory/3528-13-0x0000000000400000-0x000000000043F000-memory.dmp

                  memory/3528-19-0x0000000000400000-0x000000000043F000-memory.dmp

                  memory/3528-12-0x0000000000440000-0x0000000000540000-memory.dmp