Analysis

  • max time kernel
    59s
  • max time network
    61s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-10-2024 19:47

General

  • Target

    4940fa86109505f9f75f3852d1d86a38af4dd07e344f80469908ffaa354a1d48.exe

  • Size

    10.5MB

  • MD5

    7fb21c8ddc056e635e38d2b54e0f58ed

  • SHA1

    ee3d38330b9485e06a2bf4098fffbab3bcb92817

  • SHA256

    4940fa86109505f9f75f3852d1d86a38af4dd07e344f80469908ffaa354a1d48

  • SHA512

    10edeef859109cc83a57f561b572742cc1cac88cc30f7ca727e0097b4ec94d66d39a8effcbf893cf06047d4a6e7c8340ff7edf462c02d61488b35af6aac4088d

  • SSDEEP

    49152:cEtmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm/:b

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) 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

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

  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4940fa86109505f9f75f3852d1d86a38af4dd07e344f80469908ffaa354a1d48.exe
    "C:\Users\Admin\AppData\Local\Temp\4940fa86109505f9f75f3852d1d86a38af4dd07e344f80469908ffaa354a1d48.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2040
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xcajujtv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2528
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mpmfwysi.exe" C:\Windows\SysWOW64\xcajujtv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4112
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create xcajujtv binPath= "C:\Windows\SysWOW64\xcajujtv\mpmfwysi.exe /d\"C:\Users\Admin\AppData\Local\Temp\4940fa86109505f9f75f3852d1d86a38af4dd07e344f80469908ffaa354a1d48.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2988
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description xcajujtv "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4572
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start xcajujtv
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5088
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:1608
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2040 -s 1240
      2⤵
      • Program crash
      PID:2668
  • C:\Windows\SysWOW64\xcajujtv\mpmfwysi.exe
    C:\Windows\SysWOW64\xcajujtv\mpmfwysi.exe /d"C:\Users\Admin\AppData\Local\Temp\4940fa86109505f9f75f3852d1d86a38af4dd07e344f80469908ffaa354a1d48.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2792
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:4232
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2792 -s 388
      2⤵
      • Program crash
      PID:2100
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2792 -ip 2792
    1⤵
      PID:4548
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 2040 -ip 2040
      1⤵
        PID:3252

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\mpmfwysi.exe

        Filesize

        14.0MB

        MD5

        a4a405157ab4b7b02ea46ccbf067e216

        SHA1

        fe1f497173a7762198e1719e9557a66b9d734ece

        SHA256

        5d7d8f30f0d7ca2ce03cc4d9996de7743aec6b08e86f5148cc350e52291073d3

        SHA512

        6c93d9eeda5c9aae30f680529acdcec510188c7ce513f78ceda28f1bf5d63048b79aba72caab2b63c128946f786ba66f0bf2aab689c67ea73f458f540ea87ca6

      • memory/2040-17-0x00000000007E0000-0x00000000007F3000-memory.dmp

        Filesize

        76KB

      • memory/2040-2-0x00000000007E0000-0x00000000007F3000-memory.dmp

        Filesize

        76KB

      • memory/2040-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2040-1-0x0000000000910000-0x0000000000A10000-memory.dmp

        Filesize

        1024KB

      • memory/2040-16-0x0000000000400000-0x0000000000683000-memory.dmp

        Filesize

        2.5MB

      • memory/2040-18-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2792-8-0x0000000000400000-0x0000000000683000-memory.dmp

        Filesize

        2.5MB

      • memory/2792-9-0x0000000000400000-0x0000000000683000-memory.dmp

        Filesize

        2.5MB

      • memory/2792-15-0x0000000000400000-0x0000000000683000-memory.dmp

        Filesize

        2.5MB

      • memory/4232-57-0x0000000007D00000-0x000000000810B000-memory.dmp

        Filesize

        4.0MB

      • memory/4232-46-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-19-0x00000000010F0000-0x0000000001105000-memory.dmp

        Filesize

        84KB

      • memory/4232-20-0x00000000010F0000-0x0000000001105000-memory.dmp

        Filesize

        84KB

      • memory/4232-22-0x00000000010F0000-0x0000000001105000-memory.dmp

        Filesize

        84KB

      • memory/4232-48-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-33-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-24-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/4232-27-0x00000000025A0000-0x00000000025A6000-memory.dmp

        Filesize

        24KB

      • memory/4232-54-0x0000000007D00000-0x000000000810B000-memory.dmp

        Filesize

        4.0MB

      • memory/4232-10-0x00000000010F0000-0x0000000001105000-memory.dmp

        Filesize

        84KB

      • memory/4232-53-0x00000000031D0000-0x00000000031D5000-memory.dmp

        Filesize

        20KB

      • memory/4232-50-0x00000000031D0000-0x00000000031D5000-memory.dmp

        Filesize

        20KB

      • memory/4232-49-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-47-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-13-0x00000000010F0000-0x0000000001105000-memory.dmp

        Filesize

        84KB

      • memory/4232-45-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-44-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-43-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-42-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-41-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-40-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-39-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-38-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-37-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-36-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-35-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-34-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-30-0x00000000025B0000-0x00000000025C0000-memory.dmp

        Filesize

        64KB

      • memory/4232-26-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/4232-58-0x00000000031E0000-0x00000000031E7000-memory.dmp

        Filesize

        28KB