Analysis

  • max time kernel
    143s
  • 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
    08-09-2024 23:47

General

  • Target

    6H1CivMs9t.exe

  • Size

    236KB

  • MD5

    01d1940134ae9d585ee7faf141bba0cc

  • SHA1

    2c90ab735cf10e553347d28c1e292aed821ae3d3

  • SHA256

    a92d606e564f9e5f25a79c2d0745ff02ba1f65f062c025fc990da89c46e78038

  • SHA512

    7abe0dcb2c8850e7f598c712da1d9280e7723fb45fad58cbf5308e9d6e07701e6a88016f2cdb93d047ffe4b4453daf5ff0815b861d4473d65c8cd754ca27778e

  • SSDEEP

    3072:zFS8of+VlxyR25+BQocwlzrhMsbXvkP7xqZw0A5TuQTdzZ/pjDXYattjT4f:Sf+VlxyR25Noluq88wFuQTdJJXLm

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 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6H1CivMs9t.exe
    "C:\Users\Admin\AppData\Local\Temp\6H1CivMs9t.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2928
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zcrypqor\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1700
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jddvyimy.exe" C:\Windows\SysWOW64\zcrypqor\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1284
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create zcrypqor binPath= "C:\Windows\SysWOW64\zcrypqor\jddvyimy.exe /d\"C:\Users\Admin\AppData\Local\Temp\6H1CivMs9t.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4036
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description zcrypqor "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1684
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start zcrypqor
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2052
    • 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:2932
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2928 -s 1124
      2⤵
      • Program crash
      PID:2436
  • C:\Windows\SysWOW64\zcrypqor\jddvyimy.exe
    C:\Windows\SysWOW64\zcrypqor\jddvyimy.exe /d"C:\Users\Admin\AppData\Local\Temp\6H1CivMs9t.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5044
    • 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:2888
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5044 -s 528
      2⤵
      • Program crash
      PID:2492
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2928 -ip 2928
    1⤵
      PID:3824
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 5044 -ip 5044
      1⤵
        PID:704

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        12.8MB

        MD5

        49a8fac894fbc9b0aded887f9851b1b3

        SHA1

        8f63c62b7714d86ea8bd7b16aa8d1f8d4fd2cbf7

        SHA256

        66a241b77b324995c5ed38b2f0cd1e8497e90c8f1c16c1cbe670760cc4ea4e03

        SHA512

        d63e441221feb12f693c45e72d5fa7b2ded2c03fd11072f2a822f583cc4290fb4027775724db17a1fe30c6ea48cc6fd12e8d9a7e1f6c1bfd62cc18ac3f06cc25

      • memory/2888-11-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

        Filesize

        84KB

      • memory/2888-13-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

        Filesize

        84KB

      • memory/2888-14-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

        Filesize

        84KB

      • memory/2928-1-0x0000000002D10000-0x0000000002E10000-memory.dmp

        Filesize

        1024KB

      • memory/2928-2-0x0000000002CC0000-0x0000000002CD3000-memory.dmp

        Filesize

        76KB

      • memory/2928-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2928-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2928-8-0x0000000002CC0000-0x0000000002CD3000-memory.dmp

        Filesize

        76KB

      • memory/2928-7-0x0000000000400000-0x0000000002B5B000-memory.dmp

        Filesize

        39.4MB

      • memory/5044-15-0x0000000000400000-0x0000000002B5B000-memory.dmp

        Filesize

        39.4MB