Inter-Process Communication T1559

Events covered

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

Authoring guide

Patterns shared across the 31 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names 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 (40 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.

Top indicator values (192 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. Click a value to expand the rules under this technique that use it.

Exclusions (95 distinct)

Field/operator/value combinations excluded by rules under this technique (top-level not() clauses), sorted by how many rules exclude each. These are the false-positive paths the community has learned to filter out. A new rule that ignores the high-count entries here will likely fire on the same noisy paths. Click a value to expand the rules under this technique that exclude it.

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 9 rules

• CMSTP Execution Process Access
• Connection to Suspicious XPC Service
• Dllhost.EXE Initiated Network Connection To Non-Local IP Address
• DNS Query Request By Regsvr32.EXE
• Enable Microsoft Dynamic Data Exchange
• macOS XPC Service Abuse
• Network Connection Initiated By Regsvr32.EXE
• Trickbot Malware Activity
• XPC Connection from Unusual Location

Elastic 14 rules

• Execution of COM object via Xwizard
• Incoming DCOM Lateral Movement via MSHTA
• Incoming DCOM Lateral Movement with MMC
• Incoming DCOM Lateral Movement with ShellBrowserWindow or ShellWindows
• Potential Command and Control via Internet Explorer
• Remote XSL Script Execution via COM
• Suspicious Explorer Child Process
• Suspicious Image Load (taskschd.dll) from MS Office
• Suspicious Inter-Process Communication via Outlook
• UAC Bypass Attempt via Elevated COM Internet Explorer Add-On Installer
• UAC Bypass Attempt with IEditionUpgradeManager Elevated COM Interface
• UAC Bypass via ICMLuaUtil Elevated COM Interface
• Unix Socket Connection
• Unusual D-Bus Daemon Child Process

Splunk 6 rules

• Process Writing DynamicWrapperX
• Windows Anonymous Pipe Activity
• Windows PUA Named Pipe
• Windows RMM Named Pipe
• Windows Suspicious C2 Named Pipe
• Windows Suspicious Named Pipe

Kusto 2 rules

• Azure DevOps Personal Access Token (PAT) misuse
• Suspicious named pipes