Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    07/09/2024, 18:35

General

  • Target
    7d337cf7f54e13aa3d045336030074af0cdab304f1e781d611d086b3e7cfe438.exe
  • Size 238KB
  • Sample240907-w8llvs1apf
  • SHA256 7d337cf7f54e13aa3d045336030074af0cdab304f1e781d611d086b3e7cfe438
  • MD5 SHA1 SHA512 SSDEEP

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\7d337cf7f54e13aa3d045336030074af0cdab304f1e781d611d086b3e7cfe438.exe
    "C:\Users\Admin\AppData\Local\Temp\7d337cf7f54e13aa3d045336030074af0cdab304f1e781d611d086b3e7cfe438.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3872
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vjaqdths\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:104
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ahgtbbjn.exe" C:\Windows\SysWOW64\vjaqdths\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1628
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create vjaqdths binPath= "C:\Windows\SysWOW64\vjaqdths\ahgtbbjn.exe /d\"C:\Users\Admin\AppData\Local\Temp\7d337cf7f54e13aa3d045336030074af0cdab304f1e781d611d086b3e7cfe438.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2280
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description vjaqdths "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:760
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start vjaqdths
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1020
    • 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:3684
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3872 -s 1096
      2⤵
      • Program crash
      PID:3108
  • C:\Windows\SysWOW64\vjaqdths\ahgtbbjn.exe
    C:\Windows\SysWOW64\vjaqdths\ahgtbbjn.exe /d"C:\Users\Admin\AppData\Local\Temp\7d337cf7f54e13aa3d045336030074af0cdab304f1e781d611d086b3e7cfe438.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4344
    • 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:4336
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4344 -s 536
      2⤵
      • Program crash
      PID:4124
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3872 -ip 3872
    1⤵
      PID:1280
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 4344 -ip 4344
      1⤵
        PID:1872

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            ahgtbbjn.exe

            • Path C:\Users\Admin\AppData\Local\Temp\ahgtbbjn.exe
            • Size 13.3MB
            • SHA256 4a13311f0afd1d1b9dedbe95d6e8dcaa4cdcd9007697b44b21bb20e0c5c5c7b9
            • MD5 SHA1 SHA512 SSDEEP

            memory/3872-1-0x0000000000710000-0x0000000000810000-memory.dmp

            memory/3872-2-0x00000000022B0000-0x00000000022C3000-memory.dmp

            memory/3872-3-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/3872-9-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/3872-7-0x0000000000400000-0x0000000000443000-memory.dmp

            memory/3872-8-0x00000000022B0000-0x00000000022C3000-memory.dmp

            memory/4336-42-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-37-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-14-0x0000000000A50000-0x0000000000A65000-memory.dmp

            memory/4336-52-0x0000000001FF0000-0x0000000001FF7000-memory.dmp

            memory/4336-40-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-18-0x0000000002800000-0x0000000002A0F000-memory.dmp

            memory/4336-48-0x0000000007700000-0x0000000007B0B000-memory.dmp

            memory/4336-51-0x0000000007700000-0x0000000007B0B000-memory.dmp

            memory/4336-47-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

            memory/4336-44-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

            memory/4336-43-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-11-0x0000000000A50000-0x0000000000A65000-memory.dmp

            memory/4336-41-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-39-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-38-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-13-0x0000000000A50000-0x0000000000A65000-memory.dmp

            memory/4336-36-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-35-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-34-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-33-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-32-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-31-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-30-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-29-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-28-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-27-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-24-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            memory/4336-21-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

            memory/4336-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

            memory/4344-15-0x0000000000400000-0x0000000000443000-memory.dmp