Analysis

  • max time kernel
    141s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09-12-2024 15:10

General

  • Target

    e5e504710b99893aea0e451eacfb7c62839a131303977db144bb8b5c1fca2200.exe

  • Size

    139KB

  • MD5

    2ae457d156c22881f61b52e2c1cad0d2

  • SHA1

    4fcdcda539765d33c716903c319120b880cacb3f

  • SHA256

    e5e504710b99893aea0e451eacfb7c62839a131303977db144bb8b5c1fca2200

  • SHA512

    1eb581073f17dbe3a5f13c6924d8d00b7b7affed5ee3c26c27e2082abaccd8b379f32c5ed4c83bcd642db68ac978357cbe3d9aee641ba31f2eb97f76a407ca2a

  • SSDEEP

    3072:z1LM23IP5rlPTB4Nx13iVXxoFKlRtPnf:dMVlWxpiVhoqRtPf

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
  • 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\e5e504710b99893aea0e451eacfb7c62839a131303977db144bb8b5c1fca2200.exe
    "C:\Users\Admin\AppData\Local\Temp\e5e504710b99893aea0e451eacfb7c62839a131303977db144bb8b5c1fca2200.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2624
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yrvxtgrs\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3540
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rtwhcwlm.exe" C:\Windows\SysWOW64\yrvxtgrs\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3288
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yrvxtgrs binPath= "C:\Windows\SysWOW64\yrvxtgrs\rtwhcwlm.exe /d\"C:\Users\Admin\AppData\Local\Temp\e5e504710b99893aea0e451eacfb7c62839a131303977db144bb8b5c1fca2200.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:864
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yrvxtgrs "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2576
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yrvxtgrs
      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:2828
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2624 -s 1252
      2⤵
      • Program crash
      PID:1120
  • C:\Windows\SysWOW64\yrvxtgrs\rtwhcwlm.exe
    C:\Windows\SysWOW64\yrvxtgrs\rtwhcwlm.exe /d"C:\Users\Admin\AppData\Local\Temp\e5e504710b99893aea0e451eacfb7c62839a131303977db144bb8b5c1fca2200.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3348
    • 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:2252
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3348 -s 532
      2⤵
      • Program crash
      PID:1824
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2624 -ip 2624
    1⤵
      PID:1868
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 3348 -ip 3348
      1⤵
        PID:3884

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        13.9MB

        MD5

        5389e62cf90b80a8e0b6900e3a3e964e

        SHA1

        3ee96d8141782e977d87f90f0b9e34c8720c9d66

        SHA256

        94b5d4ae6dae5b02007dd52eb6dd55292efdb93559225e937e5c3e59d004e6b1

        SHA512

        f89656f08d36b63c1bdb410c1cac0e7c7c725381427193a87e6ec61da953d95daf959b33d7c7f0660d91754086617b40f7a331d72c261a271b7eb8f58e91f721

      • memory/2252-38-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-40-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-24-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/2252-56-0x00000000029D0000-0x00000000029D7000-memory.dmp

        Filesize

        28KB

      • memory/2252-31-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-32-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-11-0x0000000000660000-0x0000000000675000-memory.dmp

        Filesize

        84KB

      • memory/2252-33-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-52-0x0000000007380000-0x000000000778B000-memory.dmp

        Filesize

        4.0MB

      • memory/2252-36-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-37-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-18-0x0000000000660000-0x0000000000675000-memory.dmp

        Filesize

        84KB

      • memory/2252-19-0x0000000000660000-0x0000000000675000-memory.dmp

        Filesize

        84KB

      • memory/2252-51-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/2252-34-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-22-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/2252-25-0x00000000019D0000-0x00000000019D6000-memory.dmp

        Filesize

        24KB

      • memory/2252-55-0x0000000007380000-0x000000000778B000-memory.dmp

        Filesize

        4.0MB

      • memory/2252-28-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-35-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-43-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-48-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/2252-47-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-46-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-45-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-44-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-42-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-41-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2252-39-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/2624-2-0x00000000021A0000-0x00000000021B3000-memory.dmp

        Filesize

        76KB

      • memory/2624-4-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2624-13-0x0000000000400000-0x0000000000459000-memory.dmp

        Filesize

        356KB

      • memory/2624-14-0x00000000021A0000-0x00000000021B3000-memory.dmp

        Filesize

        76KB

      • memory/2624-15-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2624-1-0x00000000005F0000-0x00000000006F0000-memory.dmp

        Filesize

        1024KB

      • memory/3348-17-0x0000000000400000-0x0000000000459000-memory.dmp

        Filesize

        356KB

      • memory/3348-10-0x0000000000400000-0x0000000000459000-memory.dmp

        Filesize

        356KB

      • memory/3348-8-0x0000000000400000-0x0000000000459000-memory.dmp

        Filesize

        356KB

      • memory/3348-9-0x0000000000400000-0x0000000000459000-memory.dmp

        Filesize

        356KB