AWS EC2: How to determine whether my EC2/scalr AMI was hacked? What to do to secure it?

Posted by Niro on Server Fault See other posts from Server Fault or by Niro
Published on 2010-05-16T15:52:23Z Indexed on 2010/05/16 16:00 UTC
Read the original article Hit count: 293

Filed under:

security

|

aws

|

ec2

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scalr

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intrusion-detection

I received notification from Amazon that my instance tried to hack another server. there was no additional information besides log dump:

Original report:

Destination IPs:
Destination Ports:
Destination URLs:
Abuse Time: Sun May 16 10:13:00 UTC 2010
NTP: N
Log Extract:

External 184.xxx.yyy.zzz, 11.842.000 packets/300s (39.473 packets/s), 5 flows/300s (0 flows/s), 0,320 GByte/300s (8 MBit/s)

(184.xxx.yyy.zzz is my instance ip)

How can I tell whether someone has penetrated my instance? What are the steps I should take to make sure my instance is clean and safe to use? Is there some intrusion detection techinque or log that I can use?

Any information is highly appreciated.

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