Resubmissions

21-12-2024 22:57

241221-2xpr2atjar 10

21-12-2024 20:29

241221-y9xfvsyngy 10

Analysis

  • max time kernel
    53s
  • max time network
    91s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    21-12-2024 22:57

General

  • Target

    1b9334e09c3df74ba3135169e49533c7a4d5a6c7ce090e31188e6f6a33403b52.exe

  • Size

    226KB

  • MD5

    19407c99f4b2baf3fcd8cc632ea60b97

  • SHA1

    b6574e349b99bd865c84e79a0ca596c5fdadcaf4

  • SHA256

    1b9334e09c3df74ba3135169e49533c7a4d5a6c7ce090e31188e6f6a33403b52

  • SHA512

    969235b95372f6df5980151c6fa75ad920cee8004a2a07df114c83aec2b1c83c9a7aa53903842dcd3cfed4cd683664643f1846089386c34733921a4e08edeba5

  • SSDEEP

    3072:EOS07dizsmBglaL0X+qa6eGR5d/Lhvw35WptqsVMn2jCV+btxEnogr:NSlDL0XXabGh/dwCnVM2jCVGtxEog

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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
  • 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 5 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1b9334e09c3df74ba3135169e49533c7a4d5a6c7ce090e31188e6f6a33403b52.exe
    "C:\Users\Admin\AppData\Local\Temp\1b9334e09c3df74ba3135169e49533c7a4d5a6c7ce090e31188e6f6a33403b52.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3260
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gvzivodb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4308
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fzpgjhkt.exe" C:\Windows\SysWOW64\gvzivodb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5072
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create gvzivodb binPath= "C:\Windows\SysWOW64\gvzivodb\fzpgjhkt.exe /d\"C:\Users\Admin\AppData\Local\Temp\1b9334e09c3df74ba3135169e49533c7a4d5a6c7ce090e31188e6f6a33403b52.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:8
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description gvzivodb "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4760
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start gvzivodb
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1676
    • 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:4352
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3260 -s 704
      2⤵
      • Program crash
      PID:3600
  • C:\Windows\SysWOW64\gvzivodb\fzpgjhkt.exe
    C:\Windows\SysWOW64\gvzivodb\fzpgjhkt.exe /d"C:\Users\Admin\AppData\Local\Temp\1b9334e09c3df74ba3135169e49533c7a4d5a6c7ce090e31188e6f6a33403b52.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4280
    • 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:988
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4280 -s 540
      2⤵
      • Program crash
      PID:2784
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3260 -ip 3260
    1⤵
      PID:2900
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4280 -ip 4280
      1⤵
        PID:3436

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.2MB

        MD5

        86ddfd73b3204c49e44b3b25ffa5ba01

        SHA1

        e2e7931ca010e8d133b9ad1991904c07e1feb5d2

        SHA256

        65f0b0ff9f85f125524a30efd04c746d07a8117718e99cc6f85575ca94b375b5

        SHA512

        d304c9b5d105c724c696c259d22a33711e897e8c22f15f10cead2d9677c17c569f56e926fac64c53319cca3cf3779028fc1c19be4ad21f19379c7b9122ddc201

      • memory/988-34-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-29-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-20-0x0000000003200000-0x000000000340F000-memory.dmp

        Filesize

        2.1MB

      • memory/988-42-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-8-0x0000000001200000-0x0000000001215000-memory.dmp

        Filesize

        84KB

      • memory/988-41-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-22-0x0000000003200000-0x000000000340F000-memory.dmp

        Filesize

        2.1MB

      • memory/988-53-0x0000000008100000-0x000000000850B000-memory.dmp

        Filesize

        4.0MB

      • memory/988-23-0x00000000027F0000-0x00000000027F6000-memory.dmp

        Filesize

        24KB

      • memory/988-16-0x0000000001200000-0x0000000001215000-memory.dmp

        Filesize

        84KB

      • memory/988-17-0x0000000001200000-0x0000000001215000-memory.dmp

        Filesize

        84KB

      • memory/988-43-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-54-0x00000000035F0000-0x00000000035F7000-memory.dmp

        Filesize

        28KB

      • memory/988-50-0x0000000008100000-0x000000000850B000-memory.dmp

        Filesize

        4.0MB

      • memory/988-49-0x00000000035E0000-0x00000000035E5000-memory.dmp

        Filesize

        20KB

      • memory/988-46-0x00000000035E0000-0x00000000035E5000-memory.dmp

        Filesize

        20KB

      • memory/988-45-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-44-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-27-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-30-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-39-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-40-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-38-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-37-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-36-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-35-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-31-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-33-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/988-32-0x0000000003410000-0x0000000003420000-memory.dmp

        Filesize

        64KB

      • memory/3260-1-0x00000000006E0000-0x00000000007E0000-memory.dmp

        Filesize

        1024KB

      • memory/3260-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3260-12-0x0000000000400000-0x0000000000596000-memory.dmp

        Filesize

        1.6MB

      • memory/3260-13-0x00000000006B0000-0x00000000006C3000-memory.dmp

        Filesize

        76KB

      • memory/3260-14-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3260-2-0x00000000006B0000-0x00000000006C3000-memory.dmp

        Filesize

        76KB

      • memory/4280-9-0x0000000000400000-0x0000000000596000-memory.dmp

        Filesize

        1.6MB

      • memory/4280-11-0x0000000000400000-0x0000000000596000-memory.dmp

        Filesize

        1.6MB