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 08:15

General

  • Target

    a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe

  • Size

    401KB

  • MD5

    09622c398a7e6f315f566bc7cabfec89

  • SHA1

    c3ccda11c40b396615e5facefd3bf02d03d96c7b

  • SHA256

    a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4

  • SHA512

    5a5cbe7e55df348c46d912158dd58d735c2a289122ac46da106ee41c21432f7eea6e49dee0f0a243112c050fc6aaa85a2bddbcef7a2abd3009dcfa319746102b

  • SSDEEP

    6144:x2tEWSHPfTo04jYUy85YbRE3TgVPEHmVR0p//dZgC87mw4iklA:xvWSHPfTo04jSGYVE3hG0p/lZDsg

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\a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe
    "C:\Users\Admin\AppData\Local\Temp\a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1988
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\aslmlivn\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1304
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\szcxwqqk.exe" C:\Windows\SysWOW64\aslmlivn\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2388
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create aslmlivn binPath= "C:\Windows\SysWOW64\aslmlivn\szcxwqqk.exe /d\"C:\Users\Admin\AppData\Local\Temp\a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:212
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description aslmlivn "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1368
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start aslmlivn
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3828
    • 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:932
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1988 -s 664
      2⤵
      • Program crash
      PID:1392
  • C:\Windows\SysWOW64\aslmlivn\szcxwqqk.exe
    C:\Windows\SysWOW64\aslmlivn\szcxwqqk.exe /d"C:\Users\Admin\AppData\Local\Temp\a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4144
    • 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:456
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4144 -s 508
      2⤵
      • Program crash
      PID:4608
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1988 -ip 1988
    1⤵
      PID:3472
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 4144 -ip 4144
      1⤵
        PID:2188

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.6MB

        MD5

        d56af1483b6ff988d3b090141ab84206

        SHA1

        b12d76f6b53be15ca1a85b2cdcf8cc2bdbf0d984

        SHA256

        16c9fafd2a7d9e37b18aa4f9db2bc40351974969b2def582bae5e466bee6f5cf

        SHA512

        cf3b18ba898222f3ec72c497670834b9c904d291af628b8f16629832776192661de006c9381d4339b465089472e698f1da3bff87fe8eb2c339841f3b5dc1275c

      • memory/456-35-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-54-0x0000000007900000-0x0000000007D0B000-memory.dmp

        Filesize

        4.0MB

      • memory/456-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/456-50-0x00000000021E0000-0x00000000021E5000-memory.dmp

        Filesize

        20KB

      • memory/456-27-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-30-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-31-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-14-0x0000000000B00000-0x0000000000B15000-memory.dmp

        Filesize

        84KB

      • memory/456-47-0x00000000021E0000-0x00000000021E5000-memory.dmp

        Filesize

        20KB

      • memory/456-32-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-16-0x0000000000B00000-0x0000000000B15000-memory.dmp

        Filesize

        84KB

      • memory/456-17-0x0000000000B00000-0x0000000000B15000-memory.dmp

        Filesize

        84KB

      • memory/456-33-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-46-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-37-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/456-51-0x0000000007900000-0x0000000007D0B000-memory.dmp

        Filesize

        4.0MB

      • memory/456-55-0x00000000021F0000-0x00000000021F7000-memory.dmp

        Filesize

        28KB

      • memory/456-24-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

        Filesize

        24KB

      • memory/456-34-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-39-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-45-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-44-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-43-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-42-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-41-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-40-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-38-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/456-36-0x00000000021D0000-0x00000000021E0000-memory.dmp

        Filesize

        64KB

      • memory/1988-1-0x0000000000980000-0x0000000000A80000-memory.dmp

        Filesize

        1024KB

      • memory/1988-4-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1988-7-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/1988-8-0x0000000000750000-0x0000000000763000-memory.dmp

        Filesize

        76KB

      • memory/1988-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1988-2-0x0000000000750000-0x0000000000763000-memory.dmp

        Filesize

        76KB

      • memory/4144-18-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4144-12-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4144-13-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4144-11-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB