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
    95s
  • 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

    15938b5637e639c182992c8fdf65b8db3d461c85f6eac57044f40d2a68955372.exe

  • Size

    229KB

  • MD5

    83fd029a3fbe2efc79f203479a4c21e6

  • SHA1

    4290032c569c5eb64d7ebd4c50ef36f01f08dc27

  • SHA256

    15938b5637e639c182992c8fdf65b8db3d461c85f6eac57044f40d2a68955372

  • SHA512

    feb38390727625b364246e17217501b090d4bec00e131043887a5e7e74e9a4caa9b300fa67ed393504aacb62dd7284a471bd747ca6b2b1057b919e6d284d7c17

  • SSDEEP

    3072:GS6n5Yu86fFYNLLS8sZDRw6Cv5NOCr9YBVBNZ/IxwTGHFMtFiRiU4A:GS6uaYRLS82DKL3OCrEVzZ/IAGlmFtU

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\15938b5637e639c182992c8fdf65b8db3d461c85f6eac57044f40d2a68955372.exe
    "C:\Users\Admin\AppData\Local\Temp\15938b5637e639c182992c8fdf65b8db3d461c85f6eac57044f40d2a68955372.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4108
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\juepddx\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4464
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hnfuzsj.exe" C:\Windows\SysWOW64\juepddx\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4744
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create juepddx binPath= "C:\Windows\SysWOW64\juepddx\hnfuzsj.exe /d\"C:\Users\Admin\AppData\Local\Temp\15938b5637e639c182992c8fdf65b8db3d461c85f6eac57044f40d2a68955372.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:428
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description juepddx "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4220
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start juepddx
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4136
    • 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:4908
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4108 -s 1252
      2⤵
      • Program crash
      PID:1940
  • C:\Windows\SysWOW64\juepddx\hnfuzsj.exe
    C:\Windows\SysWOW64\juepddx\hnfuzsj.exe /d"C:\Users\Admin\AppData\Local\Temp\15938b5637e639c182992c8fdf65b8db3d461c85f6eac57044f40d2a68955372.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1120
    • 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:4440
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1120 -s 544
      2⤵
      • Program crash
      PID:2876
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4108 -ip 4108
    1⤵
      PID:3080
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1120 -ip 1120
      1⤵
        PID:1896

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.5MB

        MD5

        2fc2dcd9c9dbc9041e59a0fa193db752

        SHA1

        077243f6bbfb4b88dfa84476a51d1aa1e8c6785f

        SHA256

        4ba97fc7090f74e30a59f39c872ad9afc883d9a4c787772833d75cdca39aa3a7

        SHA512

        40d6fa2b226184063df7277fc17f0b6d4cfd2a59f8fbb826e061b46d0a64e74d13ccf9cc1baafbe13c08162c49ef871abadb75cb5f446096f7dd307a5fdb85b4

      • memory/1120-18-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/1120-12-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/1120-11-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/4108-2-0x00000000022B0000-0x00000000022C3000-memory.dmp

        Filesize

        76KB

      • memory/4108-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4108-7-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/4108-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4108-8-0x00000000022B0000-0x00000000022C3000-memory.dmp

        Filesize

        76KB

      • memory/4108-1-0x0000000000640000-0x0000000000740000-memory.dmp

        Filesize

        1024KB

      • memory/4440-46-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-39-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-15-0x0000000000980000-0x0000000000995000-memory.dmp

        Filesize

        84KB

      • memory/4440-54-0x0000000007B00000-0x0000000007F0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4440-55-0x00000000025E0000-0x00000000025E7000-memory.dmp

        Filesize

        28KB

      • memory/4440-51-0x0000000007B00000-0x0000000007F0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4440-50-0x00000000025D0000-0x00000000025D5000-memory.dmp

        Filesize

        20KB

      • memory/4440-47-0x00000000025D0000-0x00000000025D5000-memory.dmp

        Filesize

        20KB

      • memory/4440-13-0x0000000000980000-0x0000000000995000-memory.dmp

        Filesize

        84KB

      • memory/4440-45-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-44-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-43-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-42-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-41-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-40-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-17-0x0000000000980000-0x0000000000995000-memory.dmp

        Filesize

        84KB

      • memory/4440-38-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-37-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-36-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-35-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-34-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-33-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-32-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-31-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-30-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-27-0x0000000002580000-0x0000000002590000-memory.dmp

        Filesize

        64KB

      • memory/4440-24-0x0000000001FF0000-0x0000000001FF6000-memory.dmp

        Filesize

        24KB

      • memory/4440-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4440-21-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB