Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-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
  • 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
  • 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⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2164
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lwfbjlvd\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:264
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jddvyimy.exe" C:\Windows\SysWOW64\lwfbjlvd\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3552
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create lwfbjlvd binPath= "C:\Windows\SysWOW64\lwfbjlvd\jddvyimy.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:4832
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description lwfbjlvd "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4752
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start lwfbjlvd
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4564
    • 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:2352
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2164 -s 1044
      2⤵
      • Program crash
      PID:2148
  • C:\Windows\SysWOW64\lwfbjlvd\jddvyimy.exe
    C:\Windows\SysWOW64\lwfbjlvd\jddvyimy.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:4188
    • 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:1264
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4188 -s 512
      2⤵
      • Program crash
      PID:1360
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2164 -ip 2164
    1⤵
      PID:1288
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4188 -ip 4188
      1⤵
        PID:4172

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        13.5MB

        MD5

        5870b2f99f2432b1d43a0888b7037bae

        SHA1

        2d93ba289d13342a0d59ae627a84a3ea905941e7

        SHA256

        798ac01919d0dcaab1112caa938b950d4d75b53da98f3198a4d59b32072843c8

        SHA512

        b53e86b3c72df737d76b1a083fa43259d62a42ccad69ed0490d2f659add090642a14ed4a542d2db706c2db0f93cf8721cae38c48884f17a9b30b592626af3498

      • memory/1264-55-0x0000000007B90000-0x0000000007B97000-memory.dmp

        Filesize

        28KB

      • memory/1264-23-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/1264-54-0x0000000007640000-0x0000000007A4B000-memory.dmp

        Filesize

        4.0MB

      • memory/1264-47-0x0000000002BF0000-0x0000000002BF5000-memory.dmp

        Filesize

        20KB

      • memory/1264-30-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-31-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-32-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-33-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-50-0x0000000002BF0000-0x0000000002BF5000-memory.dmp

        Filesize

        20KB

      • memory/1264-15-0x0000000000A90000-0x0000000000AA5000-memory.dmp

        Filesize

        84KB

      • memory/1264-18-0x0000000000A90000-0x0000000000AA5000-memory.dmp

        Filesize

        84KB

      • memory/1264-34-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-38-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-20-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/1264-27-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-24-0x0000000002950000-0x0000000002956000-memory.dmp

        Filesize

        24KB

      • memory/1264-51-0x0000000007640000-0x0000000007A4B000-memory.dmp

        Filesize

        4.0MB

      • memory/1264-35-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-13-0x0000000000A90000-0x0000000000AA5000-memory.dmp

        Filesize

        84KB

      • memory/1264-36-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-41-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-45-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-44-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-43-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-42-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-46-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-40-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-39-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/1264-37-0x0000000002960000-0x0000000002970000-memory.dmp

        Filesize

        64KB

      • memory/2164-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2164-2-0x0000000000690000-0x00000000006A3000-memory.dmp

        Filesize

        76KB

      • memory/2164-8-0x0000000000690000-0x00000000006A3000-memory.dmp

        Filesize

        76KB

      • memory/2164-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2164-7-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/2164-1-0x00000000006B0000-0x00000000007B0000-memory.dmp

        Filesize

        1024KB

      • memory/4188-17-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4188-11-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4188-12-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB