Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects the execution of Wireshark or tshark with command-line arguments indicating TLS key logging or packet capture file handling, followed shortly by a crash handler process (WerFault.exe or WerFaultSecure.exe) for the same process.
Detects the execution of Wireshark or tshark with command-line arguments indicating TLS key logging or packet capture file handling, followed shortly by a crash handler process (WerFault.exe or WerFaultSecure.exe) for the same process.
The following analytic detects the execution of common network sniffing tools on Windows systems, including Wireshark, WinPcap, tcpdump, and similar utilities.
This activity is significant because attackers use packet capture tools to intercept and analyze network traffic, enabling credential theft, sensitive data harvesting, and reconnaissance of internal network communications.
While these tools have legitimate administrative uses, their presence in unexpected environments may indicate an adversary conducting man-in-the-middle attacks or exfiltrating sensitive information traversing the network.
If confirmed malicious, this could lead to the exposure of credentials, session tokens, and confidential data, facilitating lateral movement and further compromise of the environment.
This activity is significant because attackers use packet capture tools to intercept and analyze network traffic, enabling credential theft, sensitive data harvesting, and reconnaissance of internal network communications.
While these tools have legitimate administrative uses, their presence in unexpected environments may indicate an adversary conducting man-in-the-middle attacks or exfiltrating sensitive information traversing the network.
If confirmed malicious, this could lead to the exposure of credentials, session tokens, and confidential data, facilitating lateral movement and further compromise of the environment.
Detects unauthorized or suspicious configuration changes on Cisco IOS XR devices, specifically targeting the creation of SPAN/mirroring sessions, ACL modifications to bypass traffic filtering, and changes to AAA or local user authentication settings. These patterns are consistent with post-compromise activities by adversaries seeking persistence and traffic interception.
This rule detects the use of raw sockets by 'ERAAgent.exe' by monitoring for socket I/O control (Ioctl) operations involving 'SIO_RCVALL'. This configuration, often associated with promiscuous mode, allows an application to capture all network traffic received by the network interface, a behavior commonly used by network sniffing tools or malicious implants to intercept sensitive data.
This rule detects the use of raw sockets by 'ERAAgent.exe' by monitoring for socket I/O control (Ioctl) operations involving 'SIO_RCVALL'. This configuration, often associated with promiscuous mode, allows an application to capture all network traffic received by the network interface, a behavior commonly used by network sniffing tools or malicious implants to intercept sensitive data.
Detects the execution of powershell scripts with calls to the "Start-NetEventSession" cmdlet. Which allows an attacker to start event and packet capture for a network event session.
Adversaries may attempt to capture network to gather information over the course of an operation.
Data captured via this technique may include user credentials, especially those sent over an insecure, unencrypted protocol.
Adversaries may attempt to capture network to gather information over the course of an operation.
Data captured via this technique may include user credentials, especially those sent over an insecure, unencrypted protocol.
Detects the FTP STOR command uploading a file with a .pcap extension to an external host on port 21 or 20 — consolidated from three overlapping detections (generic server, router-specific, and capture-file variants). Indicates an adversary (e.g. Fire Ant/UNC3886) exfiltrating captured network traffic from a compromised network device via FTP.
This rule detects the use of raw sockets by 'ERAAgent.exe' by monitoring for socket I/O control (Ioctl) operations involving 'SIO_RCVALL'. This configuration, often associated with promiscuous mode, allows an application to capture all network traffic received by the network interface, a behavior commonly used by network sniffing tools or malicious implants to intercept sensitive data.
Detects the ERAAgent.exe process creating raw sockets (SOCK_RAW) and enabling promiscuous mode (SIO_RCVALL) on a non-loopback interface while lacking corresponding listening port activity. This behavior is indicative of passive magic-packet sniffing, often associated with the SLEEPWALKER backdoor/trojan.
Detects FTP STOR commands associated with the transfer of files with a .pcap extension, which may indicate the exfiltration of captured network traffic from a network device or server.
This rule detects the use of raw sockets by 'ERAAgent.exe' by monitoring for socket I/O control (Ioctl) operations involving 'SIO_RCVALL'. This configuration, often associated with promiscuous mode, allows an application to capture all network traffic received by the network interface, a behavior commonly used by network sniffing tools or malicious implants to intercept sensitive data.
This rule detects the use of raw sockets by 'ERAAgent.exe' by monitoring for socket I/O control (Ioctl) operations involving 'SIO_RCVALL'. This configuration, often associated with promiscuous mode, allows an application to capture all network traffic received by the network interface, a behavior commonly used by network sniffing tools or malicious implants to intercept sensitive data.
This rule detects the use of raw sockets by 'ERAAgent.exe' by monitoring for socket I/O control (Ioctl) operations involving 'SIO_RCVALL'. This configuration, often associated with promiscuous mode, allows an application to capture all network traffic received by the network interface, a behavior commonly used by network sniffing tools or malicious implants to intercept sensitive data.
This rule detects high-frequency, potentially malicious network connections to external infrastructure using unencrypted legacy mail protocols (SMTP: 25, POP3: 110, IMAP: 143). This pattern is consistent with an adversary-in-the-middle (AiTM) attack, where an attacker intercepts email traffic—often following DNS hijacking—to relay and potentially decrypt or harvest credentials and session tokens from plaintext sessions.
Detects the execution of 'FortiGateSniffer', a tool identified as Golang-based, used to perform passive network packet capture on compromised FortiGate devices. The rule also analyzes captured traffic for sensitive authentication protocols including RADIUS, Kerberos, and NTLM.
Detects the execution of the FortigateSniffer binary or the use of the 'diagnose sniffer packet' command on FortiGate devices, which are used to passively intercept network traffic including authentication protocols like RADIUS, NTLM, and Kerberos.
Detects the use of the 'diagnose sniffer packet' command on a FortiGate network device, which is indicative of an administrator or attacker performing network traffic capture and analysis directly from the device's management interface.
Detects the use of the 'diagnose sniffer packet' command on FortiOS, or evidence of the FortigateSniffer tool (associated with past FortiGate vulnerabilities). This behavior is indicative of unauthorized packet capture and potential credential sniffing on network infrastructure devices.
Detects the use of the Windows 'netsh.exe' utility to perform network port proxying or tracing configurations, initiated by common command-line shells (cmd.exe, powershell.exe). Attackers may use these capabilities for lateral movement, persistence, or to sniff network traffic.
Detects the use of 'netsh trace' to capture network traffic, often associated with reconnaissance activity by threat actors like The Gentlemen RaaS. The rule monitors for command patterns involving trace start/stop, interface show, and specific configuration flags like 'capture=yes', 'report=no', 'filemode=circular', or output to 'ADMIN$' shares.
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