Analysis

  • max time kernel
    119s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-20240708-en
  • resource tags

    arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
  • submitted
    04/08/2024, 14:58

General

  • Target
    f16fc2ac7e1e693ecf08ed05fe889bc0N.exe
  • Size 71KB
  • Sample240804-scc33ascrf
  • SHA256 625afc0a5a909014f9fab052f5eae642a6677d2e1f60b7593aaedabdf6864aec
  • 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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 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.

  • 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 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f16fc2ac7e1e693ecf08ed05fe889bc0N.exe
    "C:\Users\Admin\AppData\Local\Temp\f16fc2ac7e1e693ecf08ed05fe889bc0N.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2104
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dgyushtq\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1604
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iyujewuc.exe" C:\Windows\SysWOW64\dgyushtq\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2460
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create dgyushtq binPath= "C:\Windows\SysWOW64\dgyushtq\iyujewuc.exe /d\"C:\Users\Admin\AppData\Local\Temp\f16fc2ac7e1e693ecf08ed05fe889bc0N.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2108
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description dgyushtq "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2820
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start dgyushtq
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2912
    • 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:2604
  • C:\Windows\SysWOW64\dgyushtq\iyujewuc.exe
    C:\Windows\SysWOW64\dgyushtq\iyujewuc.exe /d"C:\Users\Admin\AppData\Local\Temp\f16fc2ac7e1e693ecf08ed05fe889bc0N.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2244
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Windows security bypass
      • 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:2668

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        iyujewuc.exe

        • Path C:\Users\Admin\AppData\Local\Temp\iyujewuc.exe
        • Size 13.4MB
        • SHA256 2ceb5a73b51384640e53c397e6004e8ed840d23a762b0ccd2e0215e92deaeab5
        • MD5 SHA1 SHA512 SSDEEP

        memory/2668-6-0x0000000000080000-0x0000000000095000-memory.dmp

        memory/2668-5-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2668-3-0x0000000000080000-0x0000000000095000-memory.dmp

        memory/2668-8-0x0000000000080000-0x0000000000095000-memory.dmp

        memory/2668-9-0x0000000000080000-0x0000000000095000-memory.dmp

        memory/2668-18-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-15-0x0000000000210000-0x0000000000216000-memory.dmp

        memory/2668-14-0x0000000001870000-0x0000000001A7F000-memory.dmp

        memory/2668-11-0x0000000001870000-0x0000000001A7F000-memory.dmp

        memory/2668-21-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-22-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-23-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-24-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-25-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-26-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-34-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-33-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-46-0x0000000000540000-0x0000000000547000-memory.dmp

        memory/2668-42-0x00000000053D0000-0x00000000057DB000-memory.dmp

        memory/2668-41-0x0000000000380000-0x0000000000385000-memory.dmp

        memory/2668-38-0x0000000000380000-0x0000000000385000-memory.dmp

        memory/2668-37-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-36-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-35-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-32-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-31-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-30-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-29-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-28-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-27-0x0000000000370000-0x0000000000380000-memory.dmp

        memory/2668-45-0x00000000053D0000-0x00000000057DB000-memory.dmp