Analysis

  • max time kernel
    145s
  • max time network
    153s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    03-09-2024 16:57

General

  • Target

    foufdsk.exe

  • Size

    11.2MB

  • MD5

    3482cbbb23d7548633dde35f128ea40a

  • SHA1

    b8cba7389b8e195b30ceb2e1a2b1d1fd6129adbd

  • SHA256

    8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380

  • SHA512

    db334c6aae52045ff3ce7597f172cce21f5a3a61a85b8dd4c5517eac649b60e429df968e1538c99080449d0ebfb5d8e917cb43bfa105e27d0a790ca2463748c7

  • SSDEEP

    6144:Oc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:O1OZDisvwdaxO0PuG1R4CWs

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
  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\foufdsk.exe
    "C:\Users\Admin\AppData\Local\Temp\foufdsk.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4808
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xocpeepp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2272
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cfyjjstt.exe" C:\Windows\SysWOW64\xocpeepp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3244
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create xocpeepp binPath= "C:\Windows\SysWOW64\xocpeepp\cfyjjstt.exe /d\"C:\Users\Admin\AppData\Local\Temp\foufdsk.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4852
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description xocpeepp "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1856
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start xocpeepp
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1884
    • 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:3004
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 1224
      2⤵
      • Program crash
      PID:4636
  • C:\Windows\SysWOW64\xocpeepp\cfyjjstt.exe
    C:\Windows\SysWOW64\xocpeepp\cfyjjstt.exe /d"C:\Users\Admin\AppData\Local\Temp\foufdsk.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5000
    • 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:4644
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5000 -s 560
      2⤵
      • Program crash
      PID:4704
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4808 -ip 4808
    1⤵
      PID:2296
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 5000 -ip 5000
      1⤵
        PID:3180

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        14.5MB

        MD5

        b004d58f8cfe1ecd6f9eb42f724c8cb5

        SHA1

        3bbb66017dc4d1d6c2aa71acffa2062c5cee611d

        SHA256

        087136481142164a5a182b6562b1bea536d0225f8b39874237d6f255d77b0e2b

        SHA512

        03102b176519ea2f129ec1afbeb11b2add48ee4e8b981f6aaffd86f2db7a7799a9d058c27c5dd8ed9bcc730c50717f33568524710ab282c53e4f783f1790c750

      • memory/4644-55-0x0000000007F00000-0x000000000830B000-memory.dmp

        Filesize

        4.0MB

      • memory/4644-35-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-22-0x0000000003000000-0x000000000320F000-memory.dmp

        Filesize

        2.1MB

      • memory/4644-46-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-24-0x0000000003000000-0x000000000320F000-memory.dmp

        Filesize

        2.1MB

      • memory/4644-25-0x00000000013F0000-0x00000000013F6000-memory.dmp

        Filesize

        24KB

      • memory/4644-11-0x0000000001270000-0x0000000001285000-memory.dmp

        Filesize

        84KB

      • memory/4644-28-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-45-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-32-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-33-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-18-0x0000000001270000-0x0000000001285000-memory.dmp

        Filesize

        84KB

      • memory/4644-19-0x0000000001270000-0x0000000001285000-memory.dmp

        Filesize

        84KB

      • memory/4644-44-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-56-0x00000000033E0000-0x00000000033E7000-memory.dmp

        Filesize

        28KB

      • memory/4644-52-0x0000000007F00000-0x000000000830B000-memory.dmp

        Filesize

        4.0MB

      • memory/4644-48-0x00000000033D0000-0x00000000033D5000-memory.dmp

        Filesize

        20KB

      • memory/4644-47-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-40-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-31-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-51-0x00000000033D0000-0x00000000033D5000-memory.dmp

        Filesize

        20KB

      • memory/4644-43-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-42-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-41-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-39-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-38-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-36-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-37-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4644-34-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/4808-1-0x00000000008C0000-0x00000000009C0000-memory.dmp

        Filesize

        1024KB

      • memory/4808-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4808-14-0x0000000002460000-0x0000000002473000-memory.dmp

        Filesize

        76KB

      • memory/4808-15-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4808-13-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/4808-2-0x0000000002460000-0x0000000002473000-memory.dmp

        Filesize

        76KB

      • memory/5000-17-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/5000-9-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/5000-10-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/5000-8-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB