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r/blueteamsec is a subreddit with 51k 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."
72 posts
#2
Advice Requests
: "CF-Hero: CF-Hero is a reconnaissance tool that uses multiple data sources to discover the origin IP addresses of Cloudflare-protected web applications"
4 posts
#3
Solution Requests
: "Passkeys: the promise of a simpler and safer alternative to passwords"
3 posts
#4
Pain & Anger
: "Windows BitLocker -- Screwed without a Screwdriver"
2 posts
#5
Ideas
: "Reverse Engineering Call Of Duty Anti-Cheat"
1 post
#6
Money Talk
: "Operators of Cryptocurrency Mixers Charged with Money Laundering"
1 post
Popular Topics in r/blueteamsec
#1
Security
: "emba: EMBA - The firmware Security analyzer"
80 posts
#2
Malware
: "minegrief: Self-spreading Java Malware targeting Minecraft servers. Infected servers are capable of scanning for other vulnerable servers, encrypting Minecraft worlds, and phishing players who connect."
38 posts
#3
Phishing
: "Behind the Schenes of a Chinese Phishing-As-A-Service: Lucid"
24 posts
#4
Hacking
: "10 Chinese Nationals Charged With Large-Scale Hacking Of U.S. And International Victims On Behalf Of The Chinese Government"
19 posts
#5
Ransomware
: "Fake Zoom Ends in BlackSuit Ransomware"
18 posts
#6
Vulnerability
: "Yubico PAM Module Vulnerability (CVE-2025-23013): A Deep Dive into Authentication Bypass in Certain Configurations "
14 posts
#7
Apt
: "ZDI-CAN-25373 Windows Shortcut Exploit Abused as Zero-Day in Widespread Apt Campaigns"
13 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"
12 posts
#9
Tool
: "Krueger: Proof of Concept (PoC) .NET Tool for remotely killing EDR with WDAC"
12 posts
#10
Exploit
: "Confluence Exploit Leads to LockBit Ransomware"
12 posts
Member Growth in r/blueteamsec
Yearly
+8k members(18.5%)
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