Isn't ISACA wrong with this explanation?

I came across a Q in CISM QA db that talks about a web server compromised by someone using a superuser account.
According to one of the choice - The original media should be used because one could never find and eliminate all the changes a super-user may have made or the time lines in which these changes were made.

Seriously? We can't track changes and timelines in a webserver if su account is used? Can someone please comment?

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Comments

stryder144

It is possible that as the superuser you could modify the logs, which would make it much more difficult to figure out what changes were made.

PJ_Sneakers

Original media should be used for what? Restoration, I’m assuming?

jaguaar

PJ_Sneakers wrote: »

Original media should be used for what? Restoration, I’m assuming?

Yes. That part is fine, i am not sure if yjey are correct about latter part of the sentence but PJ-Sneakers does have a point, the super user can cover his tracks

cyberguypr

You have to consider whatever the other options were. Remember that you are shooting for the BEST answer. I don't know how ISACA does things but both NIST 800-61 and SANS PICERL Incident Handling guidelines call out rebuilding systems from scratch and restoring from clean backups.

From a real world perspective, mine and my organization's risk tolerance are ultra low so I default to full rebuild when the compromise is confirmed.

PJ_Sneakers

BEST answer is probably to nuke it and start over, given the answers you have available. Realistically, you would have a lot of data to go through to figure out whether or not you have really sanitized the system, and the last thing you want to do is give the box a clean bill of health if the attacker installed a backdoor you didn't find because they did a better job than you did.