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One of our clients was sending out spam unknowingly yesterday. I spent most of my afternoon cleaning it up, tracking down how the attackers were doing it.

In this clients case, they have their own server (which we maintain), and they mostly write their own code.
Most of the common garden variety vulnerability scans don’t work on their server, because they write their own code, although in this case it didn’t save them from being exploited.

In order to find out what was causing the spamming, I had to find out how the attackers got in.
Usually this means a check of the apache logs to check for anything untoward.

In this case, although the logs had plenty of vulnerability scans (which were to files that don’t exist on their server), I couldn’t see anything in the logs that immediately stuck out as being the cause.
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