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
    05-09-2024 19:17

General

  • Target

    88af0d7e54ecf3a4221e4f44c350201023ac0180de913bbf4181510cfdf4bf79.exe

  • Size

    400KB

  • MD5

    41f6a8fcf7ada67b4f86dd5b64ecd5ae

  • SHA1

    658b41e1c70bc0a635f4a73ab3453abf31a6d9cb

  • SHA256

    88af0d7e54ecf3a4221e4f44c350201023ac0180de913bbf4181510cfdf4bf79

  • SHA512

    cf374f2ae1b399ab0597408b1639cde605f5938159744367b56dd9341049ab670b7264834ab253b398e0b9f12cf847f6888a280d596702796bfb14bfacc0cffa

  • SSDEEP

    6144:GHZdHdf9ev0BE64vu05ADX9AIw5IHK7ZlPoCofSJw:GHZdHdfsv0B6MqZlPoCo

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
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\88af0d7e54ecf3a4221e4f44c350201023ac0180de913bbf4181510cfdf4bf79.exe
    "C:\Users\Admin\AppData\Local\Temp\88af0d7e54ecf3a4221e4f44c350201023ac0180de913bbf4181510cfdf4bf79.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5436
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ftiqfqo\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4448
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fifyprlb.exe" C:\Windows\SysWOW64\ftiqfqo\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3576
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ftiqfqo binPath= "C:\Windows\SysWOW64\ftiqfqo\fifyprlb.exe /d\"C:\Users\Admin\AppData\Local\Temp\88af0d7e54ecf3a4221e4f44c350201023ac0180de913bbf4181510cfdf4bf79.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:336
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ftiqfqo "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4488
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ftiqfqo
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1708
    • 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:4624
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5436 -s 1208
      2⤵
      • Program crash
      PID:1660
  • C:\Windows\SysWOW64\ftiqfqo\fifyprlb.exe
    C:\Windows\SysWOW64\ftiqfqo\fifyprlb.exe /d"C:\Users\Admin\AppData\Local\Temp\88af0d7e54ecf3a4221e4f44c350201023ac0180de913bbf4181510cfdf4bf79.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1680
    • 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:4876
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1680 -s 576
      2⤵
      • Program crash
      PID:5340
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 5436 -ip 5436
    1⤵
      PID:3540
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 1680 -ip 1680
      1⤵
        PID:2744

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        13.1MB

        MD5

        e94da5c3207c523d9043d6b5c6285ca4

        SHA1

        ffcacc52fc7783cf197cb797a59b1144460af252

        SHA256

        c1a7cc647ac9b2e34b3588af39c1a0bf5ac58e8b5b4c3817543cb40104389115

        SHA512

        fdbbcb53d7ea9220818798f99bc1f43e665367f97f11fdd13be20e0f19053c732c180a0fd65e9d3c285e1c4a8d9187c87c84d019e2d90046b8e1ecc4b7887488

      • memory/1680-13-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/1680-19-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/1680-9-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/1680-8-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4876-43-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-50-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-10-0x0000000000A00000-0x0000000000A15000-memory.dmp

        Filesize

        84KB

      • memory/4876-55-0x0000000007700000-0x0000000007B0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4876-58-0x0000000007700000-0x0000000007B0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4876-59-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

        Filesize

        28KB

      • memory/4876-27-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4876-34-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-20-0x0000000000A00000-0x0000000000A15000-memory.dmp

        Filesize

        84KB

      • memory/4876-21-0x0000000000A00000-0x0000000000A15000-memory.dmp

        Filesize

        84KB

      • memory/4876-23-0x0000000000A00000-0x0000000000A15000-memory.dmp

        Filesize

        84KB

      • memory/4876-46-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-38-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-36-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-25-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4876-31-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-28-0x0000000001F70000-0x0000000001F76000-memory.dmp

        Filesize

        24KB

      • memory/4876-54-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

        Filesize

        20KB

      • memory/4876-51-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

        Filesize

        20KB

      • memory/4876-14-0x0000000000A00000-0x0000000000A15000-memory.dmp

        Filesize

        84KB

      • memory/4876-49-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-48-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-47-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-45-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-44-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-35-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-42-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-41-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-40-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-39-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4876-37-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/5436-1-0x0000000000890000-0x0000000000990000-memory.dmp

        Filesize

        1024KB

      • memory/5436-2-0x0000000000860000-0x0000000000873000-memory.dmp

        Filesize

        76KB

      • memory/5436-15-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/5436-16-0x0000000000860000-0x0000000000873000-memory.dmp

        Filesize

        76KB

      • memory/5436-17-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5436-4-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB