Network Sniffing T1040
Tactics: Credential Access, Discovery
Adversaries may passively sniff network traffic to capture information about an environment, including authentication material passed over the network. Network sniffing refers to using the network interface on a system to monitor or capture information sent over a wired or wireless connection. An adversary may place a network interface into promiscuous mode to passively access data in transit over the network, or use span ports to capture a larger amount of data.
Events covered
6 catalog events are tagged with this technique by at least one rule.
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
| Security-Auditing | Event ID 4697 | A service was installed in the system. |
| ESF | exec | Process Execution |
| Linux-Auditd | Event ID 1309 | EXECVE |
| PowerShell | Event ID 4104 | Creating Scriptblock text (MessageNumber of MessageTotal). |
Authoring guide
These 25 rules share fields, values, and exclusions.
Fields filtered most (36 distinct)
These fields appear most often in rule filters.
Top indicator values (176 distinct)
These values appear most often in rule predicates.
Exclusions (34 distinct)
These values appear most often in top-level exclusions.
Rules under this technique
These vendors publish rules tagged with this technique.
Sigma 11 rules
- Cisco Sniffing
- Harvesting Of Wifi Credentials Via Netsh.EXE
- Network Sniffing - Linux
- Network Sniffing - MacOs
- New Network Trace Capture Started Via Netsh.EXE
- PktMon.EXE Execution
- Potential Network Sniffing Activity Using Network Tools
- Potential Packet Capture Activity Via Start-NetEventSession - ScriptBlock
- Windows native Pktmon sniffer abuse
- Windows Pcap Drivers
- Windows traffic capture abuse
Elastic 5 rules
- AWS EC2 Full Network Packet Capture Detected
- Azure VNet Full Network Packet Capture Enabled
- Network Traffic Capture via CAP_NET_RAW
- Suspicious Network Tool Launch Detected via Defend for Containers
- Suspicious Network Tool Launched Inside A Container
Splunk 3 rules
- Cisco ASA - Packet Capture Activity
- Cisco SNMP Community String Configuration Changes
- Windows Network Sniffing Tool Executed
Kusto 3 rules
- Azure secure score PW age policy new
- Powershell Empire Cmdlets Executed in Command Line
- Zoom E2E Encryption Disabled