Detection rules › Sigma
Pulse Connect Secure RCE Attack CVE-2021-22893
This rule detects exploitation attempts using Pulse Connect Secure(PCS) vulnerability (CVE-2021-22893)
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1190 Exploit Public-Facing Application |
Rule body yaml
title: Pulse Connect Secure RCE Attack CVE-2021-22893
id: 5525edac-f599-4bfd-b926-3fa69860e766
status: stable
description: This rule detects exploitation attempts using Pulse Connect Secure(PCS) vulnerability (CVE-2021-22893)
references:
- https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784
author: Sittikorn S
date: 2021-06-29
modified: 2023-01-02
tags:
- attack.initial-access
- attack.t1190
- cve.2021-22893
- detection.emerging-threats
logsource:
category: webserver
detection:
selection1:
cs-uri-query|contains:
- '/dana-na/auth/'
- '/dana-ws/'
- '/dana-cached/'
selection2:
cs-uri-query|contains:
- '?id='
- '?token='
- 'Secid_canceltoken.cgi'
- 'CGI::param'
- 'meeting'
- 'smb'
- 'namedusers'
- 'metric'
condition: all of selection*
falsepositives:
- Vulnerability Scanning
level: high
Stages and Predicates
Stage 0: condition
all of selection*Stage 1: selection1
selection1:
cs-uri-query|contains:
- '/dana-na/auth/'
- '/dana-ws/'
- '/dana-cached/'
Stage 2: selection2
selection2:
cs-uri-query|contains:
- '?id='
- '?token='
- 'Secid_canceltoken.cgi'
- 'CGI::param'
- 'meeting'
- 'smb'
- 'namedusers'
- 'metric'
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 |
|