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6 Signs Your Linux Server Might Be Compromised (And What to Do Next)
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Intro:
Most attacks on Linux servers aren’t dramatic — they’re subtle, quiet, and often go unnoticed. A delayed SSH prompt here, unusual disk activity there — all potential red flags. If you manage public-facing or critical Linux infrastructure, knowing how to recognize early signs of compromise can make all the difference.
Here are 6 warning signs I watch for, and what I immediately do when I see them.
1. Unusual CPU or Memory Spikes
A sudden spike with no workload change might mean:
- Cryptominers
- Fork bombs
- Malicious scripts
✅ Check:
tophtopps aux --sort=-%cpu
2. New or Suspicious Users
Unexpected user accounts — especially with sudo access — are a huge red flag.
✅ Check:
getent passwd | grep '/home'grep 'sudo' /etc/group
✅ React: Lock and investigate unknown accounts immediately:
sudo usermod -L suspicious_user