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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

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