Resubmissions

10-11-2024 21:28

241110-1bhk6avgrr 10

Analysis

  • max time kernel
    145s
  • max time network
    195s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • submitted
    10-11-2024 21:28

General

  • Target

    038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Tofsee family
  • 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\038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe
    "C:\Users\Admin\AppData\Local\Temp\038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ayqsrkwp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1216
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uwzkfzop.exe" C:\Windows\SysWOW64\ayqsrkwp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:528
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ayqsrkwp binPath= "C:\Windows\SysWOW64\ayqsrkwp\uwzkfzop.exe /d\"C:\Users\Admin\AppData\Local\Temp\038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3432
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ayqsrkwp "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2300
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ayqsrkwp
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3856
    • 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:3604
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3936 -s 1036
      2⤵
      • Program crash
      PID:696
  • C:\Windows\SysWOW64\ayqsrkwp\uwzkfzop.exe
    C:\Windows\SysWOW64\ayqsrkwp\uwzkfzop.exe /d"C:\Users\Admin\AppData\Local\Temp\038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5060
    • 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:4968
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5060 -s 516
      2⤵
      • Program crash
      PID:2388
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3936 -ip 3936
    1⤵
      PID:2992
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 5060 -ip 5060
      1⤵
        PID:4688

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        11.5MB

        MD5

        2dffe3975d6c5924e0e1759ff1913319

        SHA1

        ad5ab8a77827edff9b64795143f3039108a42b7f

        SHA256

        84c635b9bf8fb79320d535d1aa7d1c9758a151ee16f695b26989011bedab2f0a

        SHA512

        d96701ce001d0c48f62674e66f2fb8d2add4d90da35d1609fafe7b497d662b95af787b09c6c6f13806c55cc0b42839fa93470a639f924b451d91100feaf24f8d

      • memory/3936-1-0x0000000000660000-0x0000000000760000-memory.dmp

        Filesize

        1024KB

      • memory/3936-2-0x0000000000640000-0x0000000000653000-memory.dmp

        Filesize

        76KB

      • memory/3936-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3936-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3936-8-0x0000000000640000-0x0000000000653000-memory.dmp

        Filesize

        76KB

      • memory/3936-7-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/4968-46-0x00000000025E0000-0x00000000025E5000-memory.dmp

        Filesize

        20KB

      • memory/4968-42-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-15-0x0000000000130000-0x0000000000145000-memory.dmp

        Filesize

        84KB

      • memory/4968-12-0x0000000000130000-0x0000000000145000-memory.dmp

        Filesize

        84KB

      • memory/4968-16-0x0000000000130000-0x0000000000145000-memory.dmp

        Filesize

        84KB

      • memory/4968-40-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-19-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/4968-26-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-23-0x00000000001F0000-0x00000000001F6000-memory.dmp

        Filesize

        24KB

      • memory/4968-50-0x0000000007040000-0x000000000744B000-memory.dmp

        Filesize

        4.0MB

      • memory/4968-49-0x00000000025E0000-0x00000000025E5000-memory.dmp

        Filesize

        20KB

      • memory/4968-53-0x0000000007040000-0x000000000744B000-memory.dmp

        Filesize

        4.0MB

      • memory/4968-45-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-44-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-43-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-54-0x00000000025F0000-0x00000000025F7000-memory.dmp

        Filesize

        28KB

      • memory/4968-41-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-39-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-38-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-37-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-36-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-35-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-34-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-33-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-32-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-31-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-30-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-29-0x0000000002350000-0x0000000002360000-memory.dmp

        Filesize

        64KB

      • memory/4968-22-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/5060-13-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/5060-11-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB