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Corelight - Possible Webshell

View on GitHub ↗Original file ↗

Description

'Detects post requests to unusual extensions.'

Rule type: Scheduled
Version: 2.2.0
Declared status: Available
Query frequency: 1h
Query period: 1h
Trigger: gt 0

Declared MITRE coverage

Persistence T1505

Declared sources

Metadata from the source file. No dependencies inferred from KQL.

Connectors

Corelight

Data types

corelight_http corelight_http_red corelight_http2 corelight_http_agg

KQL query

Original query, unchanged.

union isfuzzy=true corelight_http, corelight_http_agg
| where method in~ ('POST', 'PUT')
| where toint(status_code) between (200 .. 299)
| where request_body_len != 0 or response_body_len != 0
| extend fe = extract(@'.*(\.\w+)$', 1, uri)
| where fe in~ ('.jpg', '.jpeg', '.gif', '.png', '.icon', '.ico', '.xml', '.swf', '.svg', '.ppt', '.pttx', '.doc', '.docx', '.rtf', '.pdf', '.tif', '.zip', '.mov')

Declared entities

Source provenance

GitHub

Displayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.

File: Solutions/Corelight/Analytic Rules/CorelightPossibleWebshell.yaml ↗
Commit: 9800e51 ↗
Source identifier: f3245aa1-1ca1-471c-a0b7-97ea6b791d5d

Additional source files 2

Solutions/Corelight/Analytic Rules/CorelightPossibleWebshell.yamlsource ↗Solutions/Corelight/Data/Solution_Corelight.jsonsolution-membership ↗

GSTEP / CATALOG TRACKING

Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC

GSTEP sync dates, separate from the source content’s publication dates.