Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-10-2024 17:59

General

  • Target

    e01f2cb49081fb01eb0af6a7369d5b678b677f2e9811817ba7bbd854cb24b539N.exe

  • Size

    249KB

  • MD5

    35d94a64c3beb2bd39080b05fc763f70

  • SHA1

    5f08d3f5d0998b6eb80dd986b8efe628a5c58e19

  • SHA256

    e01f2cb49081fb01eb0af6a7369d5b678b677f2e9811817ba7bbd854cb24b539

  • SHA512

    5803cabffde0c2c62b94ce88d7243422badfc680522816d41e81b57ede4973132a3d3802b90e7dd379375409dd57d1232e796b541240819ade75b3ae2d39e2a4

  • SSDEEP

    3072:2GGHLMg57JJiSWbWkyYhnNh/RE/GtymuQ2fgu5NlssAxaxWT6Uf7J:RGHLMwlEBDxZY/Wmel

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
  • 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\e01f2cb49081fb01eb0af6a7369d5b678b677f2e9811817ba7bbd854cb24b539N.exe
    "C:\Users\Admin\AppData\Local\Temp\e01f2cb49081fb01eb0af6a7369d5b678b677f2e9811817ba7bbd854cb24b539N.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jigiendf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4064
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ovytsmmg.exe" C:\Windows\SysWOW64\jigiendf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3724
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create jigiendf binPath= "C:\Windows\SysWOW64\jigiendf\ovytsmmg.exe /d\"C:\Users\Admin\AppData\Local\Temp\e01f2cb49081fb01eb0af6a7369d5b678b677f2e9811817ba7bbd854cb24b539N.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2532
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description jigiendf "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4012
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start jigiendf
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2180
    • 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:4396
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2936 -s 1028
      2⤵
      • Program crash
      PID:2356
  • C:\Windows\SysWOW64\jigiendf\ovytsmmg.exe
    C:\Windows\SysWOW64\jigiendf\ovytsmmg.exe /d"C:\Users\Admin\AppData\Local\Temp\e01f2cb49081fb01eb0af6a7369d5b678b677f2e9811817ba7bbd854cb24b539N.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4916
    • 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:3620
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4916 -s 520
      2⤵
      • Program crash
      PID:3068
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2936 -ip 2936
    1⤵
      PID:2724
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4916 -ip 4916
      1⤵
        PID:4612

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        12.5MB

        MD5

        adf8e0dd1826f0d08d747f474624f9a7

        SHA1

        09b457f1dc05df5d36b91b1b2303fc53be6a44c7

        SHA256

        e9203f9adbd5e493042fa185b9a23739c7675e637874b8bbd499b669dd6fc694

        SHA512

        f03ea0711a7636d57d083862ccad6c99df062f19eb97471ba428ebcd9bc95cdbe079854917a0df634004316047414583a6a2275597666ff8326f1371d9c79e4b

      • memory/2936-1-0x0000000000710000-0x0000000000810000-memory.dmp

        Filesize

        1024KB

      • memory/2936-2-0x00000000006D0000-0x00000000006E3000-memory.dmp

        Filesize

        76KB

      • memory/2936-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2936-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2936-8-0x00000000006D0000-0x00000000006E3000-memory.dmp

        Filesize

        76KB

      • memory/2936-7-0x0000000000400000-0x000000000053A000-memory.dmp

        Filesize

        1.2MB

      • memory/3620-45-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-41-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-55-0x0000000007800000-0x0000000007C0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3620-14-0x0000000000A30000-0x0000000000A45000-memory.dmp

        Filesize

        84KB

      • memory/3620-16-0x0000000000A30000-0x0000000000A45000-memory.dmp

        Filesize

        84KB

      • memory/3620-17-0x0000000000A30000-0x0000000000A45000-memory.dmp

        Filesize

        84KB

      • memory/3620-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3620-53-0x0000000007800000-0x0000000007C0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3620-51-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        Filesize

        20KB

      • memory/3620-56-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

        Filesize

        28KB

      • memory/3620-48-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        Filesize

        20KB

      • memory/3620-47-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-46-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-24-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3620-44-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-43-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-42-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-25-0x0000000001FE0000-0x0000000001FE6000-memory.dmp

        Filesize

        24KB

      • memory/3620-40-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-39-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-38-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-37-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-36-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-35-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-34-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-33-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-32-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-31-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/3620-28-0x0000000001FF0000-0x0000000002000000-memory.dmp

        Filesize

        64KB

      • memory/4916-13-0x0000000000400000-0x000000000053A000-memory.dmp

        Filesize

        1.2MB

      • memory/4916-11-0x0000000000400000-0x000000000053A000-memory.dmp

        Filesize

        1.2MB

      • memory/4916-19-0x0000000000400000-0x000000000053A000-memory.dmp

        Filesize

        1.2MB

      • memory/4916-12-0x0000000000400000-0x000000000053A000-memory.dmp

        Filesize

        1.2MB