Costin Raiu ✓

@craiu · Bucharest · joined 10 Oct 2007

Cybersecurity researcher focused on threat intel & APTs. Breaking down attacks, hunting threats, and crafting YARA rules. Buddy @ Three Buddy Problem

39 646Followers

7 764Following

10 452Posts total

43KViews on collected posts

Latest posts

Costin Raiu ✓@craiu15 Sep

Always funny to see these @Yubico https://t.co/Ty60fnSZOq

4.8K views · 78 likes · 8 reposts · 2 replies Open on X →

Costin Raiu ✓@craiu15 Sep

Currently lots of issues with Linux kernel 7.x on multiple systems. You may want to hold on the upgrade until they stabilize it. Here's a list of problems I ran into: 8.2K views · 50 likes · 10 reposts · 4 replies Open on X →

Costin Raiu ✓@craiu14 Sep

Your everyday workhorse LLM for CTI workflows 👉 5.2K views · 23 likes · 5 reposts · 2 replies Open on X →

Costin Raiu ✓@craiu14 Sep

Some newer IPs trying to exploit or probe for the recent #MikroTik SSH authentication bypass. You may want to block these in your firewalls. 😎 146[.]19[.]216[.]125 172[.]104[.]114[.]238 178[.]62[.]124[.]12 187[.]15[.]135[.]119 212[.]11[.]29[.]24 45[.]61[.]177[.]253 3.8K views · 41 likes · 10 reposts · 3 replies Open on X →

Costin Raiu ✓@craiu10 Jan

@craiu @ryanaraine @juanandres_gs Great share, was just looking for such a list! 133 views · 1 likes · 0 reposts · 0 replies Open on X →

Costin Raiu ✓@craiu10 Jan

@craiu @ryanaraine @juanandres_gs Awesome thanks for sharing 👌 608 views · 3 likes · 0 reposts · 0 replies Open on X →

Costin Raiu ✓@craiu9 Jan

The Cybersecurity Booklist: 11 Must-Reads for 2026 from The Three Buddy Problem Podcast: https://t.co/XuM7Bd0MXh @ryanaraine @juanandres_gs 20.2K views · 55 likes · 8 reposts · 4 replies Open on X →

Against accounts of the same size

4 posts from the last 90 days, next to the 10K–100K follower range. shown widely, but few of those viewers react.

Median views5 017this account924median for 10K–100K

Reach, %12.65%this account3.62%median for 10K–100K

Engagement, %1.13%this account1.52%median for 10K–100K

Metric	This account	Median for 10K–100K	Ratio
Median views per post	5 017	924	5.43×
Reach (views ÷ followers)	12.65%	3.62%	3.50×
Engagement rate	1.13%	1.52%	0.74×

Others in this range → Compare with another account → How these benchmarks are built →

Growth & engagement

How the posts we collected actually performed: views and reaction rate post by post, what the audience did with them, and where the follower count goes.

Views per post

20.2K9 Jan

60810 Jan

133

3.8K14 Sep

5.2K

8.2K15 Sep

4.8K

Last 7 collected posts, oldest on the left. The scale is logarithmic: one post can outrun the rest a hundred times over.

Engagement rate per post

0.34%9 Jan

0.49%10 Jan

0.75%

1.48%14 Sep

0.57%

0.78%15 Sep

1.83%

Reactions — likes, reposts, replies and quotes — divided by views. Median for 10K–100K accounts is 1.52%.

What the audience does

Likes62.6%251 in total

Reposts10.2%41 in total

Replies3.7%15 in total

Quotes0.7%3 in total

Bookmarks22.7%91 in total

Share of every reaction we collected for this account. Replies mean argument, reposts mean endorsement, bookmarks mean the post was worth keeping.

The follower curve appears once this account has two daily snapshots — we take one a day, and this one is on its first.