Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-09-2024 01:07

General

  • Target

    27ca44d4fca5a29c0018efeebbda04250739a546e4b7879bd5a547aaea1de80d.exe

  • Size

    415KB

  • MD5

    1c5083792acfccf5d90db80884569ace

  • SHA1

    6be243663a2d173dcd728146f2a3d1a5a974ff38

  • SHA256

    27ca44d4fca5a29c0018efeebbda04250739a546e4b7879bd5a547aaea1de80d

  • SHA512

    8af309adcaed0055ca8b2c879a1ff16e9d0d853ab3837c94719d09c03bf27b32125581f525ef99caa4488b184bfc5565b033333cd4af9e4240aa23963dd76a1b

  • SSDEEP

    6144:+nhYTBI6ONsWWqOaejSlD8viNV43Km3Wlz8+5FXCnFk:2aTy6OlO3GDyYnSC

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 1 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\27ca44d4fca5a29c0018efeebbda04250739a546e4b7879bd5a547aaea1de80d.exe
    "C:\Users\Admin\AppData\Local\Temp\27ca44d4fca5a29c0018efeebbda04250739a546e4b7879bd5a547aaea1de80d.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2676
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pbtyyzti\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:6040
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wuefhdgm.exe" C:\Windows\SysWOW64\pbtyyzti\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5180
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create pbtyyzti binPath= "C:\Windows\SysWOW64\pbtyyzti\wuefhdgm.exe /d\"C:\Users\Admin\AppData\Local\Temp\27ca44d4fca5a29c0018efeebbda04250739a546e4b7879bd5a547aaea1de80d.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2200
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description pbtyyzti "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:964
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start pbtyyzti
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2716
    • 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:5588
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2676 -s 1032
      2⤵
      • Program crash
      PID:4888
  • C:\Windows\SysWOW64\pbtyyzti\wuefhdgm.exe
    C:\Windows\SysWOW64\pbtyyzti\wuefhdgm.exe /d"C:\Users\Admin\AppData\Local\Temp\27ca44d4fca5a29c0018efeebbda04250739a546e4b7879bd5a547aaea1de80d.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2172
    • 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:6060
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2172 -s 556
      2⤵
      • Program crash
      PID:5860
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2676 -ip 2676
    1⤵
      PID:6024
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 2172 -ip 2172
      1⤵
        PID:6076

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.1MB

        MD5

        1d679b4c50d9ae102070c0a0a7103d0d

        SHA1

        73710002af87c8c388e027fa32b5c26f320e7f83

        SHA256

        0199c6e26e1fecef741d97e163e62082dc9e0cdd22880ce8e4a4f77fab7edfa4

        SHA512

        eab8e95e4f2634c6ebb231e773c7fbb99f9c19dc83b297535ac95e467acf0e7dca55fc30dc38aa178ee887b4e15ea5d340162b32bd26805f26e8c571a6f0aa4e

      • memory/2172-15-0x0000000000400000-0x000000000247F000-memory.dmp

        Filesize

        32.5MB

      • memory/2676-2-0x0000000002550000-0x0000000002563000-memory.dmp

        Filesize

        76KB

      • memory/2676-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2676-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2676-8-0x0000000002550000-0x0000000002563000-memory.dmp

        Filesize

        76KB

      • memory/2676-7-0x0000000000400000-0x000000000247F000-memory.dmp

        Filesize

        32.5MB

      • memory/2676-1-0x00000000025F0000-0x00000000026F0000-memory.dmp

        Filesize

        1024KB

      • memory/6060-41-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-36-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-13-0x0000000000E80000-0x0000000000E95000-memory.dmp

        Filesize

        84KB

      • memory/6060-34-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-52-0x0000000002FF0000-0x0000000002FF7000-memory.dmp

        Filesize

        28KB

      • memory/6060-48-0x0000000007A40000-0x0000000007E4B000-memory.dmp

        Filesize

        4.0MB

      • memory/6060-47-0x0000000002FE0000-0x0000000002FE5000-memory.dmp

        Filesize

        20KB

      • memory/6060-44-0x0000000002FE0000-0x0000000002FE5000-memory.dmp

        Filesize

        20KB

      • memory/6060-43-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-42-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-11-0x0000000000E80000-0x0000000000E95000-memory.dmp

        Filesize

        84KB

      • memory/6060-40-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-39-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-38-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-37-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-14-0x0000000000E80000-0x0000000000E95000-memory.dmp

        Filesize

        84KB

      • memory/6060-35-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-33-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-31-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-30-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-29-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-28-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-51-0x0000000007A40000-0x0000000007E4B000-memory.dmp

        Filesize

        4.0MB

      • memory/6060-27-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-24-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-21-0x00000000021F0000-0x00000000021F6000-memory.dmp

        Filesize

        24KB

      • memory/6060-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/6060-32-0x0000000002D50000-0x0000000002D60000-memory.dmp

        Filesize

        64KB

      • memory/6060-17-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB