mandiant/capa-rules

use word boundaries to reduce FPs when detecting strings using regular expressions

Open

#1,109 opened on Jan 28, 2026

View on GitHub
 (9 comments) (1 reaction) (1 assignee) (234 forks)github user discovery
false positivegood first issuehelp wanted

Repository metrics

Stars
 (721 stars)
PR merge metrics
 (PR metrics pending)

Description

e.g. /frida(\.exe)?/i can be updated to /\bfrida(\.exe)?\b/i to avoid matching common strings like friday.

Contributor guide

Research direction
Identify all regular expressions in the rule files that match process names (e.g., 'frida') and add word boundaries (\b) to avoid false positives like 'friday'.
Tech stack
None
Domain
security
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
regex
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70