Skip to content

Create headers_outlook_express.yml #3329

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 5 commits into from
Nov 6, 2025
Merged

Create headers_outlook_express.yml #3329

Changes from all commits
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
1021d2f
Create headers_outlook_express.yml
markmsublime Oct 1, 2025
95ceb45
Update headers_outlook_express.yml
markmsublime Oct 1, 2025
b9c40c3
Auto add rule ID
Oct 1, 2025
0215a2f
Sync .github directory from main branch
alex-herold Oct 28, 2025
af89fc4
Merge branch 'main' into markmsublime-patch-14
markmsublime Nov 3, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 19 additions & 0 deletions detection-rules/headers_outlook_express.yml
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
name: "Headers: Outlook Express mailer"
description: "Detects emails claiming to be sent from Outlook Express, which is a legacy email client that is no longer supported or commonly used."
type: "rule"
severity: "medium"
source: |
strings.icontains(headers.mailer, 'Outlook Express')
and not profile.by_sender_email().any_messages_benign
tags:
- "Attack surface reduction"
attack_types:
- "BEC/Fraud"
- "Credential Phishing"
- "Malware/Ransomware"
tactics_and_techniques:
- "Evasion"
- "Spoofing"
detection_methods:
- "Header analysis"
id: "b7a698de-08c0-5f1a-8172-896438e632ea"
Loading