Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240704-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240704-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/07/2024, 10:12

General

  • Target
    11222841531ac66827a7dc6b50e40865c97e3570d6a8c5ef853c67b9f7d974a7.exe
  • Size 212KB
  • Sample240709-l8nfcayblp
  • SHA256 11222841531ac66827a7dc6b50e40865c97e3570d6a8c5ef853c67b9f7d974a7
  • MD5 SHA1 SHA512 SSDEEP

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
  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\11222841531ac66827a7dc6b50e40865c97e3570d6a8c5ef853c67b9f7d974a7.exe
    "C:\Users\Admin\AppData\Local\Temp\11222841531ac66827a7dc6b50e40865c97e3570d6a8c5ef853c67b9f7d974a7.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4068
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\idlfqldf\
      2⤵
        PID:2984
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ecmnplou.exe" C:\Windows\SysWOW64\idlfqldf\
        2⤵
          PID:4988
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create idlfqldf binPath= "C:\Windows\SysWOW64\idlfqldf\ecmnplou.exe /d\"C:\Users\Admin\AppData\Local\Temp\11222841531ac66827a7dc6b50e40865c97e3570d6a8c5ef853c67b9f7d974a7.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4052
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description idlfqldf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start idlfqldf
          2⤵
          • Launches sc.exe
          PID:2064
        • 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
          PID:3168
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4068 -s 1196
          2⤵
          • Program crash
          PID:552
      • C:\Windows\SysWOW64\idlfqldf\ecmnplou.exe
        C:\Windows\SysWOW64\idlfqldf\ecmnplou.exe /d"C:\Users\Admin\AppData\Local\Temp\11222841531ac66827a7dc6b50e40865c97e3570d6a8c5ef853c67b9f7d974a7.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4452
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4616
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4452 -s 524
          2⤵
          • Program crash
          PID:4860
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4068 -ip 4068
        1⤵
          PID:4712
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4452 -ip 4452
          1⤵
            PID:2848

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                ecmnplou.exe

                • Path C:\Users\Admin\AppData\Local\Temp\ecmnplou.exe
                • Size 14.2MB
                • SHA256 c21ebb1316feea3ac6ceef0ffd8336d6ca70325de90d021a1cb03ea8b6ddf65e
                • MD5 SHA1 SHA512 SSDEEP

                memory/4068-2-0x0000000004560000-0x0000000004573000-memory.dmp

                memory/4068-4-0x0000000000400000-0x0000000000415000-memory.dmp

                memory/4068-9-0x0000000000400000-0x0000000000415000-memory.dmp

                memory/4068-8-0x0000000004560000-0x0000000004573000-memory.dmp

                memory/4068-7-0x0000000000400000-0x000000000281C000-memory.dmp

                memory/4068-1-0x0000000002AC0000-0x0000000002BC0000-memory.dmp

                memory/4452-15-0x0000000000400000-0x000000000281C000-memory.dmp

                memory/4616-42-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-37-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-13-0x0000000000650000-0x0000000000665000-memory.dmp

                memory/4616-34-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-52-0x0000000007750000-0x0000000007757000-memory.dmp

                memory/4616-51-0x0000000007200000-0x000000000760B000-memory.dmp

                memory/4616-48-0x0000000007200000-0x000000000760B000-memory.dmp

                memory/4616-47-0x00000000027F0000-0x00000000027F5000-memory.dmp

                memory/4616-44-0x00000000027F0000-0x00000000027F5000-memory.dmp

                memory/4616-43-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-11-0x0000000000650000-0x0000000000665000-memory.dmp

                memory/4616-41-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-40-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-39-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-38-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-14-0x0000000000650000-0x0000000000665000-memory.dmp

                memory/4616-36-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-35-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-33-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-32-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-31-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-30-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-29-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-28-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-27-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-20-0x0000000002200000-0x000000000240F000-memory.dmp

                memory/4616-18-0x0000000002200000-0x000000000240F000-memory.dmp

                memory/4616-24-0x0000000002520000-0x0000000002530000-memory.dmp

                memory/4616-21-0x0000000002510000-0x0000000002516000-memory.dmp