Anvilogic high experimental spl
Suspicious reCAPTCHA Command Line [splunk-edr]
This use case detects commonly abused LOLBAS utilities referencing reCAPTCHA in the command line.
Detection Logic
`get_endpoint_data` `get_endpoint_data_edr` ("powershell.exe"
OR "pwsh.exe"
OR "cmd.exe"
OR "services.exe"
OR "dllhost.exe"
OR "rundll32.exe"
OR "cscript.exe"
OR "wscript.exe"
OR "mshta.exe"
OR "regsvr32.exe") (TERM(reCAPTCHA)
OR TERM(robot)
OR TERM(human))
| regex process_path="(?i)(powershell
| pwsh
| cmd
| services
| dllhost
| rundll32
| mshta
| regsvr32
| cscript
| wscript)\.exe"
| where match(process, "(?i)\sreCAPTCHA\s
| I\s+am\s+not\s+a\s+robot
| Verify\s+you\s+are\s+human")
| table _time, host, user parent_*, process_*, process
| bin span=1s
| stats values(*) as * by _time, host Field Validations
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