Detection rules › Sigma
Suspicious Windows Strings In URI
Detects suspicious Windows strings in URI which could indicate possible exfiltration or webshell communication
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1505.003 Server Software Component: Web Shell |
Rule body yaml
title: Suspicious Windows Strings In URI
id: 9f6a34b4-2688-4eb7-a7f5-e39fef573d0e
status: test
description: Detects suspicious Windows strings in URI which could indicate possible exfiltration or webshell communication
references:
- https://thedfirreport.com/2022/06/06/will-the-real-msiexec-please-stand-up-exploit-leads-to-data-exfiltration/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-06-06
modified: 2023-01-02
tags:
- attack.persistence
- attack.exfiltration
- attack.t1505.003
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- '=C:/Users'
- '=C:/Program%20Files'
- '=C:/Windows'
- '=C%3A%5CUsers'
- '=C%3A%5CProgram%20Files'
- '=C%3A%5CWindows'
condition: selection
falsepositives:
- Legitimate application and websites that use windows paths in their URL
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
cs-uri-query|contains:
- '=C:/Users'
- '=C:/Program%20Files'
- '=C:/Windows'
- '=C%3A%5CUsers'
- '=C%3A%5CProgram%20Files'
- '=C%3A%5CWindows'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
cs-uri-query | match |
|