Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14-12-2024 19:02

General

  • Target

    a0330635ce7a544213e96160b46657fbc7c774c29e7224d9d9d7363253fd53f4.exe

  • Size

    13.9MB

  • MD5

    2b34fa5102a1706dae4a66b48d08dd4e

  • SHA1

    28c2e4119f1ad75f64ca6c63edcf7709fbc65f32

  • SHA256

    a0330635ce7a544213e96160b46657fbc7c774c29e7224d9d9d7363253fd53f4

  • SHA512

    ad94a47157e1457699e9b6334c461b0c4d223958c72e133f68859e0a0c0f3886da8edb629a1a7e5fd594a8c0944b3e43c7e916f4059785cfd8b05c3cacd93223

  • SSDEEP

    3072:I1MBkxvfGaF/FzWb9VT5aLj/JSC5kJwSFjhvoGECaNwxAk8Je8Je8Je8Je8Je8JR:Pk5FOkjRSC6SS+N+

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.

  • Tofsee family
  • 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
  • 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\a0330635ce7a544213e96160b46657fbc7c774c29e7224d9d9d7363253fd53f4.exe
    "C:\Users\Admin\AppData\Local\Temp\a0330635ce7a544213e96160b46657fbc7c774c29e7224d9d9d7363253fd53f4.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2968
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ptvkohpn\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1848
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe" C:\Windows\SysWOW64\ptvkohpn\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4828
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ptvkohpn binPath= "C:\Windows\SysWOW64\ptvkohpn\ybyrikeu.exe /d\"C:\Users\Admin\AppData\Local\Temp\a0330635ce7a544213e96160b46657fbc7c774c29e7224d9d9d7363253fd53f4.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:452
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ptvkohpn "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5044
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ptvkohpn
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4932
    • 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:404
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2968 -s 1236
      2⤵
      • Program crash
      PID:2408
  • C:\Windows\SysWOW64\ptvkohpn\ybyrikeu.exe
    C:\Windows\SysWOW64\ptvkohpn\ybyrikeu.exe /d"C:\Users\Admin\AppData\Local\Temp\a0330635ce7a544213e96160b46657fbc7c774c29e7224d9d9d7363253fd53f4.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2576
    • 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:1780
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2576 -s 512
      2⤵
      • Program crash
      PID:2664
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2968 -ip 2968
    1⤵
      PID:4460
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2576 -ip 2576
      1⤵
        PID:4244

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        13.3MB

        MD5

        dcf3ca244350a968b1f098aa9b88333d

        SHA1

        1a1c6c52b7a7010715013bc61109837cc75c1d59

        SHA256

        2784883451d7d534c1dfce40c990011dfef14b4389b946d0afbbeda356d27853

        SHA512

        0f4feb704386518babfc37372e2ab29cb5258af3bcf1bb6c7ecc52fd007c22a843769f33b1ee6c5061d73319e0eb4d1443bb3005d68c206e4f05e197af695bd9

      • memory/1780-42-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-34-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-51-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/1780-20-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1780-21-0x00000000019D0000-0x00000000019D6000-memory.dmp

        Filesize

        24KB

      • memory/1780-9-0x0000000000320000-0x0000000000335000-memory.dmp

        Filesize

        84KB

      • memory/1780-24-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-27-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-14-0x0000000000320000-0x0000000000335000-memory.dmp

        Filesize

        84KB

      • memory/1780-15-0x0000000000320000-0x0000000000335000-memory.dmp

        Filesize

        84KB

      • memory/1780-18-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1780-52-0x00000000025D0000-0x00000000025D7000-memory.dmp

        Filesize

        28KB

      • memory/1780-48-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/1780-47-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/1780-45-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/1780-43-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-28-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-29-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-30-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-40-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-39-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-38-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-37-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-36-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-35-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-41-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-33-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-32-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1780-31-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2576-13-0x0000000000400000-0x0000000002B4B000-memory.dmp

        Filesize

        39.3MB

      • memory/2968-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2968-12-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2968-2-0x0000000004750000-0x0000000004763000-memory.dmp

        Filesize

        76KB

      • memory/2968-8-0x0000000000400000-0x0000000002B4B000-memory.dmp

        Filesize

        39.3MB

      • memory/2968-11-0x0000000004750000-0x0000000004763000-memory.dmp

        Filesize

        76KB

      • memory/2968-1-0x0000000002B70000-0x0000000002C70000-memory.dmp

        Filesize

        1024KB