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r/blueteamsec is a subreddit with 52k members. Its distinguishing qualities are that the community is large in size, and has high activity.
We focus on technical intelligence, research and engineering to help operational [blue|purple] teams defend their estates and have awareness of the world.
Popular Themes in r/blueteamsec
#1
News
: "cradle: CRADLE is a collaborative platform for Cyber Threat Intelligence analysts. It streamlines threat investigations with integrated note-taking, automated data linking, interactive visualizations, and robust access control."
78 posts
#2
Solution Requests
: "ExtensionHound: Chrome Extension DNS Forensics Tool"
2 posts
#3
Advice Requests
: "Recommendations for side gigs"
2 posts
#4
Ideas
: "Reverse Engineering Call Of Duty Anti-Cheat"
1 post
Popular Topics in r/blueteamsec
#1
Security
: "Fake Zoom Ends in BlackSuit Ransomware"
52 posts
#2
Malware
: "Malware Source Code Released (Sryxen Paid)"
46 posts
#3
Ransomware
: "Fake Zoom Ends in BlackSuit Ransomware"
21 posts
#4
Cybersecurity
: "Active Directory Domain Services Elevation of Privilege Vulnerability (CVE-2025-21293)"
20 posts
#5
Tools
19 posts
#6
Attack
: "Signed. Sideloaded. Compromised! - "identified a sophisticated multi-stage Attack leveraging vishing, remote access tooling, and living-off-the-land techniques to gain initial access and establish persistence.""
18 posts
#7
Phishing
: "Behind the Schenes of a Chinese Phishing-As-A-Service: Lucid"
18 posts
#8
Vulnerabilities
: "VMSA-2025-0004: a critical VMware Security Advisory (VMSA), VMSA-2025-0004, addressing security Vulnerabilities found and resolved in VMware ESX regarding a mechanism where threat actors could access the hypervisor through a running virtual machine"
18 posts
#9
Exploit
: "Confluence Exploit Leads to LockBit Ransomware"
14 posts
#10
Websites
12 posts
Member Growth in r/blueteamsec
Yearly
+8k members(18.9%)
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