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
    05-09-2024 18:14

General

  • Target

    537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe

  • Size

    400KB

  • MD5

    56bcd07602b26cd5c6224dd22bb26b7c

  • SHA1

    c7bd8d8c02a310beaf6abd1c58edaa9d02b5f2a2

  • SHA256

    537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe

  • SHA512

    a3eb4d77155f9d9533e7969ea737c537776e108e7d943269d21fcc6dc63a58e46d13135549c659d86a6de9123f8add18c49beee14c470b7c57ef3646bef57b7b

  • SSDEEP

    6144:mPAbuY32ftPCe4n79+JtUKzBqddIs00jUS0l/g5VfcA:mcuY32ftPCb79KAUs00j10lWVf

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe
    "C:\Users\Admin\AppData\Local\Temp\537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4208
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fxoheucy\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3824
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ovytsmmg.exe" C:\Windows\SysWOW64\fxoheucy\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4660
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create fxoheucy binPath= "C:\Windows\SysWOW64\fxoheucy\ovytsmmg.exe /d\"C:\Users\Admin\AppData\Local\Temp\537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4828
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description fxoheucy "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2008
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start fxoheucy
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1084
    • 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:4044
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4208 -s 1256
      2⤵
      • Program crash
      PID:1196
  • C:\Windows\SysWOW64\fxoheucy\ovytsmmg.exe
    C:\Windows\SysWOW64\fxoheucy\ovytsmmg.exe /d"C:\Users\Admin\AppData\Local\Temp\537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3608
    • 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:3108
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3608 -s 516
      2⤵
      • Program crash
      PID:996
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4208 -ip 4208
    1⤵
      PID:1932
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3608 -ip 3608
      1⤵
        PID:4008

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.7MB

        MD5

        5dc80b5b94eaf2ea7f9158aa460f17f9

        SHA1

        052ff402cfe178a15468dead1c74d37e54797fee

        SHA256

        09bef0804709942c7631c3f0e70ad07e5f927a7cfd6da09acbb9edc3c659ea1c

        SHA512

        a55f01b3d63e266e9b0d2c6894bf09458f09fb8f26b2bb4287a589c9324642c093ee0efe081916f04ae4653f59001f82a535d676805f6d94736dac1bf2c62640

      • memory/3108-46-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-43-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3108-44-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-54-0x0000000007900000-0x0000000007D0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3108-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3108-24-0x00000000021F0000-0x00000000021F6000-memory.dmp

        Filesize

        24KB

      • memory/3108-27-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-45-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-15-0x0000000000B40000-0x0000000000B55000-memory.dmp

        Filesize

        84KB

      • memory/3108-16-0x0000000000B40000-0x0000000000B55000-memory.dmp

        Filesize

        84KB

      • memory/3108-30-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-38-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-55-0x0000000002DF0000-0x0000000002DF7000-memory.dmp

        Filesize

        28KB

      • memory/3108-51-0x0000000007900000-0x0000000007D0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3108-50-0x0000000002DE0000-0x0000000002DE5000-memory.dmp

        Filesize

        20KB

      • memory/3108-47-0x0000000002DE0000-0x0000000002DE5000-memory.dmp

        Filesize

        20KB

      • memory/3108-31-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-13-0x0000000000B40000-0x0000000000B55000-memory.dmp

        Filesize

        84KB

      • memory/3108-32-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-36-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-41-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-40-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-39-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-37-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-42-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-35-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-34-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3108-33-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3608-18-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3608-11-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3608-12-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4208-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4208-1-0x00000000008D0000-0x00000000009D0000-memory.dmp

        Filesize

        1024KB

      • memory/4208-7-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4208-8-0x0000000002370000-0x0000000002383000-memory.dmp

        Filesize

        76KB

      • memory/4208-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4208-2-0x0000000002370000-0x0000000002383000-memory.dmp

        Filesize

        76KB