Analysis

  • max time kernel
    148s
  • max time network
    151s
  • 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, 19:51

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 6 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:4488
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sifphahl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3180
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zczsjlfv.exe" C:\Windows\SysWOW64\sifphahl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3328
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create sifphahl binPath= "C:\Windows\SysWOW64\sifphahl\zczsjlfv.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:3340
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description sifphahl "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3000
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start sifphahl
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1528
    • 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:3096
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4488 -s 1036
      2⤵
      • Program crash
      PID:620
  • C:\Windows\SysWOW64\sifphahl\zczsjlfv.exe
    C:\Windows\SysWOW64\sifphahl\zczsjlfv.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:3184
    • 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:1184
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3184 -s 512
      2⤵
      • Program crash
      PID:1664
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4488 -ip 4488
    1⤵
      PID:3392
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3184 -ip 3184
      1⤵
        PID:4320

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.3MB

        MD5

        5270e897d718016d89819c78e55b1c4f

        SHA1

        4bc6dc896aff58d1666807e1f7132e2865d52dee

        SHA256

        a750807c3483faa80d10ae9d09c5ce1825f3e30ed5bd6580a011251d8a077e85

        SHA512

        9953fafec9a15d5fb542e6d2dfa03641776fe9bb83dec210931a750beee9aef1056e6d85da44fff81f39281a9cb216b362f4055119c16db8fefc51e4bdd37011

      • memory/1184-45-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-35-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-21-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1184-33-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-23-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1184-24-0x00000000007F0000-0x00000000007F6000-memory.dmp

        Filesize

        24KB

      • memory/1184-27-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-30-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-14-0x00000000003B0000-0x00000000003C5000-memory.dmp

        Filesize

        84KB

      • memory/1184-16-0x00000000003B0000-0x00000000003C5000-memory.dmp

        Filesize

        84KB

      • memory/1184-31-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-17-0x00000000003B0000-0x00000000003C5000-memory.dmp

        Filesize

        84KB

      • memory/1184-54-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/1184-43-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-55-0x00000000019E0000-0x00000000019E7000-memory.dmp

        Filesize

        28KB

      • memory/1184-51-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/1184-32-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-47-0x00000000019D0000-0x00000000019D5000-memory.dmp

        Filesize

        20KB

      • memory/1184-34-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-50-0x00000000019D0000-0x00000000019D5000-memory.dmp

        Filesize

        20KB

      • memory/1184-40-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-42-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-41-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-44-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-39-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-38-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-37-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-36-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1184-46-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/3184-18-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3184-12-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3184-13-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3184-11-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4488-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4488-1-0x0000000000610000-0x0000000000710000-memory.dmp

        Filesize

        1024KB

      • memory/4488-7-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4488-8-0x0000000000780000-0x0000000000793000-memory.dmp

        Filesize

        76KB

      • memory/4488-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4488-2-0x0000000000780000-0x0000000000793000-memory.dmp

        Filesize

        76KB