ATT&CK coverage › Technique

Non-Application Layer Protocol `T1095`

Adversaries may use an OSI non-application layer protocol for communication between host and C2 server or among infected hosts within a network. The list of possible protocols is extensive. Specific examples include use of network layer protocols, such as the Internet Control Message Protocol (ICMP), transport layer protocols, such as the User Datagram Protocol (UDP), session layer protocols, such as Socket Secure (SOCKS), as well as redirected/tunneled protocols, such as Serial over LAN (SOL).

Events covered

3 catalog events are tagged with this technique by at least one rule.

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.
PowerShell	400

Authoring guide

Patterns shared across the 2 rules above: which fields they filter on, what specific values they look for, and what they exclude. Field names are normalized across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.

Fields filtered most (3 distinct)

The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.

Field	Rules	How	Sample values
`Data`	1	`match` 1	`powercat` , `powercat.ps1`
`Image`	1	`ends_with` 1	`\netcat.exe`, `\ncat.exe`, `\nc.exe`
`CommandLine`	1	`match` 1	`-lvp` , `-lv -p` , `--sh-exec`

Top indicator values (14 distinct)

Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique.

Field	Kind	Value	Rules (here)
`Data`	`match`	`powercat.ps1`	1
`Data`	`match`	`powercat`	1
`CommandLine`	`match`	`--sh-exec`	1
`CommandLine`	`match`	`-l -v -p`	1
`CommandLine`	`match`	`-lvnp`	1
`Image`	`ends_with`	`\netcat.exe`	1
`CommandLine`	`match`	`-lv -p`	1
`CommandLine`	`match`	`-vnl -e`	1
`CommandLine`	`match`	`--lua-exec`	1
`CommandLine`	`match`	`-l --proxy-type http`	1
`CommandLine`	`match`	`-lvp`	1
`Image`	`ends_with`	`\ncat.exe`	1
`CommandLine`	`match`	`-vnl --exec`	1
`Image`	`ends_with`	`\nc.exe`	1

Rules under this technique

Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.

Sigma 2 rules

Netcat The Powershell Version severity medium, 1 event, 2 indicators, 0 exclusions
PUA - Netcat Suspicious Execution severity high, 2 events, 12 indicators, 0 exclusions