Analysis

  • max time kernel
    148s
  • 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
    04/09/2024, 12:51

General

  • Target

    c8429917332f470b4e52c49d20490066a0c40381d6e60b732e82c50aa169405c.exe

  • Size

    213KB

  • MD5

    bbe557849887cec6ae81a416bad916e0

  • SHA1

    4a1d6ec85d604c1fbe96ad32ee94a7fbfdab797a

  • SHA256

    c8429917332f470b4e52c49d20490066a0c40381d6e60b732e82c50aa169405c

  • SHA512

    ed96746db7e2b12bc1ce9e9ec31ea75d19ccc67587b52aee9800a3123d437f6d97ddabb2a3f5b7a63ae4444fc59fb39d8a117fc3ade52cd77472f3c746415910

  • SSDEEP

    3072:lGCCafq9b79ZJ3k8e+sNPTRtr9sGVJx169blf49aTbQ:bfq9b79ZJ3kfPpsGZ8Pg9i

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\c8429917332f470b4e52c49d20490066a0c40381d6e60b732e82c50aa169405c.exe
    "C:\Users\Admin\AppData\Local\Temp\c8429917332f470b4e52c49d20490066a0c40381d6e60b732e82c50aa169405c.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4392
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vehoxqgk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2972
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sietogem.exe" C:\Windows\SysWOW64\vehoxqgk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4512
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create vehoxqgk binPath= "C:\Windows\SysWOW64\vehoxqgk\sietogem.exe /d\"C:\Users\Admin\AppData\Local\Temp\c8429917332f470b4e52c49d20490066a0c40381d6e60b732e82c50aa169405c.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3084
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description vehoxqgk "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5116
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start vehoxqgk
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4436
    • 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:228
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4392 -s 1096
      2⤵
      • Program crash
      PID:224
  • C:\Windows\SysWOW64\vehoxqgk\sietogem.exe
    C:\Windows\SysWOW64\vehoxqgk\sietogem.exe /d"C:\Users\Admin\AppData\Local\Temp\c8429917332f470b4e52c49d20490066a0c40381d6e60b732e82c50aa169405c.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4964
    • 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:4596
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4964 -s 540
      2⤵
      • Program crash
      PID:5108
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4392 -ip 4392
    1⤵
      PID:1508
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 4964 -ip 4964
      1⤵
        PID:3564

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.2MB

        MD5

        c2f96faf34faf4bbf86076190775d638

        SHA1

        e78205e089d87c460797ad8aa1b038f0b5b5bfeb

        SHA256

        77cb7f8136f26f07c79c925ab86e81436dbc5e3bc97302ec0598d443093e4926

        SHA512

        f98581f2273a98c974817b15bcbc78444ee2dc224d4fe94eea2650c018e59fbf1aae6641b3cfe267bffd3731ee09705d2e897adfa2ce18b92f815cf70bf82380

      • memory/4392-1-0x00000000005A0000-0x00000000006A0000-memory.dmp

        Filesize

        1024KB

      • memory/4392-2-0x0000000002290000-0x00000000022A3000-memory.dmp

        Filesize

        76KB

      • memory/4392-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4392-8-0x0000000002290000-0x00000000022A3000-memory.dmp

        Filesize

        76KB

      • memory/4392-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4392-7-0x0000000000400000-0x000000000043C000-memory.dmp

        Filesize

        240KB

      • memory/4596-44-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

        Filesize

        20KB

      • memory/4596-40-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-14-0x0000000000A00000-0x0000000000A15000-memory.dmp

        Filesize

        84KB

      • memory/4596-52-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

        Filesize

        28KB

      • memory/4596-39-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-34-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-18-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4596-21-0x0000000001F70000-0x0000000001F76000-memory.dmp

        Filesize

        24KB

      • memory/4596-48-0x0000000007700000-0x0000000007B0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4596-51-0x0000000007700000-0x0000000007B0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4596-47-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

        Filesize

        20KB

      • memory/4596-11-0x0000000000A00000-0x0000000000A15000-memory.dmp

        Filesize

        84KB

      • memory/4596-43-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-42-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-41-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-13-0x0000000000A00000-0x0000000000A15000-memory.dmp

        Filesize

        84KB

      • memory/4596-38-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-37-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-36-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-35-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-33-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-32-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-31-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-30-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-29-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-28-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-27-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-24-0x0000000001F80000-0x0000000001F90000-memory.dmp

        Filesize

        64KB

      • memory/4596-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4964-15-0x0000000000400000-0x000000000043C000-memory.dmp

        Filesize

        240KB