Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    05/09/2024, 12:40

General

  • Target

    12821c196cc88a3a45e493333ce627531cf80eb69b770d09f3e06e0d2e902579.exe

  • Size

    400KB

  • MD5

    66c15920677ca47cf65247493d81c74f

  • SHA1

    797d67f514d1b406e6136070f093c3cbf52ef883

  • SHA256

    12821c196cc88a3a45e493333ce627531cf80eb69b770d09f3e06e0d2e902579

  • SHA512

    d31b09a5a70feaf073ed9bf17f62a54a6176c7e06c98ca2e6e5499be6b8feb8540494535897e93dcc645431810db9fac2ab9af76df1d63f0badf78016dfbf2a7

  • SSDEEP

    6144:56/s3XfhkfwSUSspgpgEffFWweOSWKc8i5ELrtcJ/e/sVhtA:56/s3Xfhkf1spgn7e2EGFus

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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\12821c196cc88a3a45e493333ce627531cf80eb69b770d09f3e06e0d2e902579.exe
    "C:\Users\Admin\AppData\Local\Temp\12821c196cc88a3a45e493333ce627531cf80eb69b770d09f3e06e0d2e902579.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3300
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dvuharo\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4656
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ehalluvv.exe" C:\Windows\SysWOW64\dvuharo\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1332
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create dvuharo binPath= "C:\Windows\SysWOW64\dvuharo\ehalluvv.exe /d\"C:\Users\Admin\AppData\Local\Temp\12821c196cc88a3a45e493333ce627531cf80eb69b770d09f3e06e0d2e902579.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2908
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description dvuharo "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3112
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start dvuharo
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2772
    • 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:1288
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3300 -s 800
      2⤵
      • Program crash
      PID:3956
  • C:\Windows\SysWOW64\dvuharo\ehalluvv.exe
    C:\Windows\SysWOW64\dvuharo\ehalluvv.exe /d"C:\Users\Admin\AppData\Local\Temp\12821c196cc88a3a45e493333ce627531cf80eb69b770d09f3e06e0d2e902579.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4680
    • 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:1032
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4680 -s 536
      2⤵
      • Program crash
      PID:1156
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4680 -ip 4680
    1⤵
      PID:3428
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 3300 -ip 3300
      1⤵
        PID:328

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.3MB

        MD5

        9cb560834e944bc40f020cc4d0dc298f

        SHA1

        f7d0ca004f27a619ab37dac4b63e524b8f38bad6

        SHA256

        200b7b10f7ed9c5aa43246f0a88625ae5afa03fb46c28f56ae7e8d60bdf22bc9

        SHA512

        2c06dcb335be84bdabdf80d28978f20659dcae465e4b6f9c02fc37b46006151769b4b5a9b23cd06f5c15859dabc00c7f20f2c9c195b4239b33dbf58fd1f7cf48

      • memory/1032-41-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-39-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-58-0x0000000007C80000-0x000000000808B000-memory.dmp

        Filesize

        4.0MB

      • memory/1032-27-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/1032-14-0x0000000000DE0000-0x0000000000DF5000-memory.dmp

        Filesize

        84KB

      • memory/1032-11-0x0000000000DE0000-0x0000000000DF5000-memory.dmp

        Filesize

        84KB

      • memory/1032-28-0x00000000011F0000-0x00000000011F6000-memory.dmp

        Filesize

        24KB

      • memory/1032-31-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-34-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-35-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-36-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-37-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-20-0x0000000000DE0000-0x0000000000DF5000-memory.dmp

        Filesize

        84KB

      • memory/1032-21-0x0000000000DE0000-0x0000000000DF5000-memory.dmp

        Filesize

        84KB

      • memory/1032-23-0x0000000000DE0000-0x0000000000DF5000-memory.dmp

        Filesize

        84KB

      • memory/1032-25-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/1032-59-0x00000000031D0000-0x00000000031D7000-memory.dmp

        Filesize

        28KB

      • memory/1032-55-0x0000000007C80000-0x000000000808B000-memory.dmp

        Filesize

        4.0MB

      • memory/1032-54-0x00000000025F0000-0x00000000025F5000-memory.dmp

        Filesize

        20KB

      • memory/1032-51-0x00000000025F0000-0x00000000025F5000-memory.dmp

        Filesize

        20KB

      • memory/1032-38-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-49-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-50-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-47-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-46-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-45-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-44-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-43-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-42-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-48-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/1032-40-0x0000000002560000-0x0000000002570000-memory.dmp

        Filesize

        64KB

      • memory/3300-1-0x00000000006D0000-0x00000000007D0000-memory.dmp

        Filesize

        1024KB

      • memory/3300-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3300-18-0x0000000002440000-0x0000000002453000-memory.dmp

        Filesize

        76KB

      • memory/3300-19-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3300-17-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3300-2-0x0000000002440000-0x0000000002453000-memory.dmp

        Filesize

        76KB

      • memory/4680-16-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4680-8-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4680-9-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4680-10-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB