Identifies suspicious processes being spawned by the Microsoft Exchange Server worker process (w3wp). This activity may indicate exploitation activity or access to an existing web shell backdoor.
Rule type: eql
Risk score: 73
Runs every: 5m
Maximum alerts per execution: 100
- Threat Detection
- Initial Access
Rule license: Elastic License v2
## Config If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
process where event.type == "start" and process.parent.name : "w3wp.exe" and process.parent.args : "MSExchange*AppPool" and (process.name : ("cmd.exe", "powershell.exe", "pwsh.exe", "powershell_ise.exe") or process.pe.original_file_name in ("cmd.exe", "powershell.exe", "pwsh.dll", "powershell_ise.exe"))
Framework: MITRE ATT&CKTM