Analysis

  • max time kernel
    149s
  • 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, 23:43

General

  • Target

    05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe

  • Size

    213KB

  • MD5

    0556ab04b1d32de6dd710e9ce41c5144

  • SHA1

    511605433251c6d4608c3573e6dbe7da539dc25c

  • SHA256

    05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824

  • SHA512

    dc0899c1c49cac93fc29c3bf73aa2f34e23d6a972cf95a6ace710b59a4cbcab005d44643d42421dd47132b70984ddcaf1ea20cc502469b109aad361bda8c63b2

  • SSDEEP

    3072:+ASCGfSRnbJBJ1zduUJ8lmGl6Ag9ailfqy5bQ:CfSRnbJBJdUC84Guyw

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe
    "C:\Users\Admin\AppData\Local\Temp\05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2760
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gglgaiou\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4808
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rurkbdxn.exe" C:\Windows\SysWOW64\gglgaiou\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3496
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create gglgaiou binPath= "C:\Windows\SysWOW64\gglgaiou\rurkbdxn.exe /d\"C:\Users\Admin\AppData\Local\Temp\05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1108
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description gglgaiou "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2280
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start gglgaiou
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3004
    • 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:128
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2760 -s 624
      2⤵
      • Program crash
      PID:3908
  • C:\Windows\SysWOW64\gglgaiou\rurkbdxn.exe
    C:\Windows\SysWOW64\gglgaiou\rurkbdxn.exe /d"C:\Users\Admin\AppData\Local\Temp\05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5020
    • 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:3124
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5020 -s 536
      2⤵
      • Program crash
      PID:2336
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2760 -ip 2760
    1⤵
      PID:3108
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 5020 -ip 5020
      1⤵
        PID:1864

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        13.4MB

        MD5

        7e39c9044fadb2e5b3e4c25a7e2b9c15

        SHA1

        adaef0ca920d03a0dda428925c69e072d5abf390

        SHA256

        c2f8b2a294eac0bc4e0cdcb4dc5a11df67b4acaebc4b152366dff4f9e2902f93

        SHA512

        0c0b8fedfa6cc55607e3458f65065dae488499ebec2720f6cea466c35f5f905379b22ddf244fc9b3f4aa33743bdb01100bc2b460d5d70d42db534d0e8349e0db

      • memory/2760-1-0x0000000000720000-0x0000000000820000-memory.dmp

        Filesize

        1024KB

      • memory/2760-2-0x00000000006E0000-0x00000000006F3000-memory.dmp

        Filesize

        76KB

      • memory/2760-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2760-7-0x0000000000400000-0x000000000043C000-memory.dmp

        Filesize

        240KB

      • memory/2760-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2760-8-0x00000000006E0000-0x00000000006F3000-memory.dmp

        Filesize

        76KB

      • memory/3124-41-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-37-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-14-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

        Filesize

        84KB

      • memory/3124-52-0x0000000002FD0000-0x0000000002FD7000-memory.dmp

        Filesize

        28KB

      • memory/3124-18-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3124-48-0x0000000007A80000-0x0000000007E8B000-memory.dmp

        Filesize

        4.0MB

      • memory/3124-51-0x0000000007A80000-0x0000000007E8B000-memory.dmp

        Filesize

        4.0MB

      • memory/3124-47-0x00000000023F0000-0x00000000023F5000-memory.dmp

        Filesize

        20KB

      • memory/3124-44-0x00000000023F0000-0x00000000023F5000-memory.dmp

        Filesize

        20KB

      • memory/3124-43-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-42-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-11-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

        Filesize

        84KB

      • memory/3124-40-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-39-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-38-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-13-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

        Filesize

        84KB

      • memory/3124-36-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-35-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-34-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-33-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-32-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-31-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-30-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-29-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-28-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-27-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-24-0x0000000002360000-0x0000000002370000-memory.dmp

        Filesize

        64KB

      • memory/3124-21-0x0000000000FF0000-0x0000000000FF6000-memory.dmp

        Filesize

        24KB

      • memory/3124-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/5020-15-0x0000000000400000-0x000000000043C000-memory.dmp

        Filesize

        240KB