Analysis

  • max time kernel
    149s
  • 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
    03/09/2024, 14:18

General

  • Target

    57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe

  • Size

    414KB

  • MD5

    2b67e390e0b1d03d9b6e99d0271b8883

  • SHA1

    3c5dbe4222c43bbb6c8065142eb660a9c07af33e

  • SHA256

    57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367

  • SHA512

    c040572536f174f22dd20308c754ee81fdb5fafe99f555575227113e7fdb67462eba5ecadbf645c2f6f6798b15d64b7950774d3d2340db76c06764210c26576b

  • SSDEEP

    3072:DaX5P74gWHs72AQo6ssNJb1SyLhzmqSWCXwwQS7tbdi2lA7MJZ4899kbKn4yixxb:W5jpWHs720fO0ysHR02lAMp9iK4dMt

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\57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe
    "C:\Users\Admin\AppData\Local\Temp\57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:796
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vbglfnwt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1312
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yfmpeslv.exe" C:\Windows\SysWOW64\vbglfnwt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3560
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create vbglfnwt binPath= "C:\Windows\SysWOW64\vbglfnwt\yfmpeslv.exe /d\"C:\Users\Admin\AppData\Local\Temp\57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3136
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description vbglfnwt "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5084
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start vbglfnwt
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:232
    • 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:2756
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 796 -s 1104
      2⤵
      • Program crash
      PID:3956
  • C:\Windows\SysWOW64\vbglfnwt\yfmpeslv.exe
    C:\Windows\SysWOW64\vbglfnwt\yfmpeslv.exe /d"C:\Users\Admin\AppData\Local\Temp\57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4472
    • 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:4132
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4472 -s 540
      2⤵
      • Program crash
      PID:3192
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 796 -ip 796
    1⤵
      PID:2904
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 4472 -ip 4472
      1⤵
        PID:2724

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        14.2MB

        MD5

        9bc9709926f2875698881cc5b06b7273

        SHA1

        f89e251fe307f874901f7b953804d7468854a2af

        SHA256

        37697d883b04b8f43b8cb97b642d0dbb4ddf985ff9ce44dd6b4218bdd11cdfbc

        SHA512

        cac053c1f84e5ef63c3dc4694c4efcf0afa7b8e733f57e0de750db6ba88b59bb94ffcd6c83b01ea667fa203bc251914cac5134c7f71e7064f3c5f0e50ee460ed

      • memory/796-15-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/796-1-0x00000000008B0000-0x00000000009B0000-memory.dmp

        Filesize

        1024KB

      • memory/796-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/796-2-0x0000000000860000-0x0000000000873000-memory.dmp

        Filesize

        76KB

      • memory/796-13-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB

      • memory/796-14-0x0000000000860000-0x0000000000873000-memory.dmp

        Filesize

        76KB

      • memory/4132-46-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-42-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-55-0x0000000007180000-0x000000000758B000-memory.dmp

        Filesize

        4.0MB

      • memory/4132-11-0x00000000004D0000-0x00000000004E5000-memory.dmp

        Filesize

        84KB

      • memory/4132-22-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/4132-18-0x00000000004D0000-0x00000000004E5000-memory.dmp

        Filesize

        84KB

      • memory/4132-19-0x00000000004D0000-0x00000000004E5000-memory.dmp

        Filesize

        84KB

      • memory/4132-25-0x00000000009A0000-0x00000000009A6000-memory.dmp

        Filesize

        24KB

      • memory/4132-52-0x0000000007180000-0x000000000758B000-memory.dmp

        Filesize

        4.0MB

      • memory/4132-56-0x00000000027D0000-0x00000000027D7000-memory.dmp

        Filesize

        28KB

      • memory/4132-51-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/4132-48-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/4132-47-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-31-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-45-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-44-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-43-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-24-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/4132-41-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-40-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-39-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-38-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-37-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-36-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-35-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-34-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-33-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-32-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4132-28-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/4472-9-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB

      • memory/4472-8-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB

      • memory/4472-17-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB

      • memory/4472-10-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB