Analysis

  • max time kernel
    149s
  • max time network
    102s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250610-en
  • resource tags

    arch:x64arch:x86image:win11-20250610-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    13/10/2025, 19:00

General

  • Target
    l.exe
  • Size 103KB
  • Sample251013-xnnfdshr7t
  • SHA256 b6c1ee0c0a7b9a88d6cffaf90c950b7e0e96a841cc3e37c5242f6bff2a1c8202
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Path
  • C:\Program Files\Common Files\microsoft shared\ClickToRun\readme.txt

  • fog

Ransom Note
  • If you are reading this, then you have been the victim of a cyber attack. We call ourselves Fog and we take responsibility for this incident. You can check out our blog where we post company data: xbkv2qey6u3gd3qxcojynrt4h5sgrhkar6whuo74wo63hijnn677jnyd.onion You might appear there if you opt out of our communication. We are the ones who encrypted your data and also copied some of it to our internal resource. The sooner you contact us, the sooner we can resolve this incident and get you back to work. To contact us you need to have Tor browser installed: 1. Follow this link: xql562evsy7njcsngacphc2erzjfecwotdkobn3m4uxu2gtqh26newid.onion 2. Enter the code: 58XMS26R7R3D031KKJH0HA7N 3. Now we can communicate safely. If you are decision-maker, you will get all the details when you get in touch. We are waiting for you.
URLs
  • http://xbkv2qey6u3gd3qxcojynrt4h5sgrhkar6whuo74wo63hijnn677jnyd.onion

  • http://xql562evsy7njcsngacphc2erzjfecwotdkobn3m4uxu2gtqh26newid.onion

Signatures

  • Fog Ransomware

    Fog ransomware is used to attacks educational organizations and was first seen in the spring of 2024.

  • Fog family
  • Renames multiple (1787) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Modifies Windows Firewall 2 TTPs 2 IoCs
  • Network Service Discovery 1 TTPs 2 IoCs

    Attempt to gather information on host's network.

  • Enumerates processes with tasklist 1 TTPs 1 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 6 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 32 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • System Network Connections Discovery 1 TTPs 2 IoCs

    Attempt to get a listing of network connections.

  • Gathers network information 2 TTPs 2 IoCs

    Uses commandline utility to view network configuration.

  • Gathers system information 1 TTPs 1 IoCs

    Runs systeminfo.exe.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\l.exe
    "C:\Users\Admin\AppData\Local\Temp\l.exe"
    1⤵
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:5392
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c net config Workstation
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:5160
      • C:\Windows\SysWOW64\net.exe
        net config Workstation
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2596
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 config Workstation
          4⤵
          • System Location Discovery: System Language Discovery
          PID:3944
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c systeminfo
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1472
      • C:\Windows\SysWOW64\systeminfo.exe
        systeminfo
        3⤵
        • System Location Discovery: System Language Discovery
        • Gathers system information
        PID:5964
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c hostname
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4780
      • C:\Windows\SysWOW64\HOSTNAME.EXE
        hostname
        3⤵
        • System Location Discovery: System Language Discovery
        PID:4864
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c net users
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4896
      • C:\Windows\SysWOW64\net.exe
        net users
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:5008
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 users
          4⤵
          • System Location Discovery: System Language Discovery
          PID:4336
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c ipconfig /all
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:5060
      • C:\Windows\SysWOW64\ipconfig.exe
        ipconfig /all
        3⤵
        • System Location Discovery: System Language Discovery
        • Gathers network information
        PID:2188
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c route print
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3092
      • C:\Windows\SysWOW64\ROUTE.EXE
        route print
        3⤵
        • System Location Discovery: System Language Discovery
        PID:4596
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c arp -A
      2⤵
      • Network Service Discovery
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3228
      • C:\Windows\SysWOW64\ARP.EXE
        arp -A
        3⤵
        • Network Service Discovery
        • System Location Discovery: System Language Discovery
        PID:5104
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c netstat -ano
      2⤵
      • System Location Discovery: System Language Discovery
      • System Network Connections Discovery
      • Suspicious use of WriteProcessMemory
      PID:4420
      • C:\Windows\SysWOW64\NETSTAT.EXE
        netstat -ano
        3⤵
        • System Location Discovery: System Language Discovery
        • System Network Connections Discovery
        • Gathers network information
        • Suspicious use of AdjustPrivilegeToken
        PID:4948
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c netsh firewall show state
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2428
      • C:\Windows\SysWOW64\netsh.exe
        netsh firewall show state
        3⤵
        • Modifies Windows Firewall
        • Event Triggered Execution: Netsh Helper DLL
        • System Location Discovery: System Language Discovery
        PID:3404
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c netsh firewall show config
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:5124
      • C:\Windows\SysWOW64\netsh.exe
        netsh firewall show config
        3⤵
        • Modifies Windows Firewall
        • Event Triggered Execution: Netsh Helper DLL
        • System Location Discovery: System Language Discovery
        PID:3452
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c schtasks /query /fo LIST /v
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4200
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /query /fo LIST /v
        3⤵
        • System Location Discovery: System Language Discovery
        PID:3812
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c tasklist /SVC
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4648
      • C:\Windows\SysWOW64\tasklist.exe
        tasklist /SVC
        3⤵
        • Enumerates processes with tasklist
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        PID:2568
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c net start
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4100
      • C:\Windows\SysWOW64\net.exe
        net start
        3⤵
        • System Location Discovery: System Language Discovery
        PID:4244
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 start
          4⤵
          • System Location Discovery: System Language Discovery
          PID:5588
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c DRIVERQUERY
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1728
      • C:\Windows\SysWOW64\driverquery.exe
        DRIVERQUERY
        3⤵
        • System Location Discovery: System Language Discovery
        PID:6068

Network

        MITRE ATT&CK Enterprise v16

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        Downloads

        readme.txt

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\readme.txt
        • Size 837B
        • SHA256 9b39cf062257deff5a19badd7ffb3886e573f7e2ee841cae120320ef05e4cc3c
        • MD5 SHA1 SHA512

        DbgLog.sys

        • Path C:\Users\Admin\AppData\Local\Temp\DbgLog.sys
        • Size 7KB
        • SHA256 981ecdb2342d687234533cec9c75ec39834df5ad17fe1905026fffedfac7b592
        • MD5 SHA1 SHA512 SSDEEP

        DbgLog.sys

        • Path C:\Users\Admin\AppData\Local\Temp\DbgLog.sys
        • Size 465B
        • SHA256 5dde0035c82931839a15e98c2713535b558d0966faf7451827f093741a38f0d0
        • MD5 SHA1 SHA512