Analysis

  • max time kernel
    142s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 22:26

General

  • Target

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe

  • Size

    265KB

  • MD5

    695c14c51ae9ff59157cf69f97b2d1cc

  • SHA1

    4688eea11efa5c61c7704b5ca80196eb9099e867

  • SHA256

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1

  • SHA512

    e43e45420544f2fd736f2427443941f1da5b8d4a74d4c9d2e0a95c8306b2f10e12beaa6b0c2ec2715ecbd66b41431f404c942c32720a8b3ee2afa640657d4688

  • SSDEEP

    3072:d6LaowspCAE+mYgDxv5l7Iek5Ym7IQoiteVFWbVD22WsgAsR6c7ovb3TQh9:SaWCAF5Cf7Iem57InitGMxycQMrT

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) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 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).

  • Program crash 1 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe
    "C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4444
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mjnmkpjc\
      2⤵
        PID:2500
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bnvsylrp.exe" C:\Windows\SysWOW64\mjnmkpjc\
        2⤵
          PID:3924
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mjnmkpjc binPath= "C:\Windows\SysWOW64\mjnmkpjc\bnvsylrp.exe /d\"C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3884
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mjnmkpjc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4644
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mjnmkpjc
          2⤵
          • Launches sc.exe
          PID:2116
        • 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
          PID:4576
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4444 -s 1204
          2⤵
          • Program crash
          PID:1812
      • C:\Windows\SysWOW64\mjnmkpjc\bnvsylrp.exe
        C:\Windows\SysWOW64\mjnmkpjc\bnvsylrp.exe /d"C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe"
        1⤵
        • Executes dropped EXE
        PID:2300
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4444 -ip 4444
        1⤵
          PID:4528

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

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              Downloads

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

                Filesize

                14.0MB

                MD5

                2da10fc09a391f14a73c782698479c6d

                SHA1

                f0db4556aea9f4e26396c9f908089f0a81a33ef9

                SHA256

                b5a8de64a754131ef86339c210414ac59f45c1db9f854bd00d6c74601877ada9

                SHA512

                66f14443059c06a254718fde8384cb9db8dfc412a312845df1d8297dbc1922cf4d0cf7f045c61dddb5b27fbec27aaf753f44a37054ab676e3e283d11b0292135

              • C:\Windows\SysWOW64\mjnmkpjc\bnvsylrp.exe

                Filesize

                14.0MB

                MD5

                2da10fc09a391f14a73c782698479c6d

                SHA1

                f0db4556aea9f4e26396c9f908089f0a81a33ef9

                SHA256

                b5a8de64a754131ef86339c210414ac59f45c1db9f854bd00d6c74601877ada9

                SHA512

                66f14443059c06a254718fde8384cb9db8dfc412a312845df1d8297dbc1922cf4d0cf7f045c61dddb5b27fbec27aaf753f44a37054ab676e3e283d11b0292135

              • memory/4444-1-0x00000000005F0000-0x00000000006F0000-memory.dmp

                Filesize

                1024KB

              • memory/4444-2-0x0000000000500000-0x0000000000513000-memory.dmp

                Filesize

                76KB

              • memory/4444-4-0x0000000000400000-0x00000000004F6000-memory.dmp

                Filesize

                984KB

              • memory/4444-7-0x0000000000400000-0x00000000004F6000-memory.dmp

                Filesize

                984KB