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On Thu 06 Oct 2011 10:32:14 PM IST, Michael Mol wrote: |
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> |
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> On Oct 6, 2011 12:57 PM, "Nilesh Govindarajan" <contact@××××××××.com |
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> <mailto:contact@××××××××.com>> wrote: |
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> > |
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> > On Thu 06 Oct 2011 09:06:06 PM IST, Alberto Luaces wrote: |
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> > > Nilesh Govindarajan writes: |
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> > > |
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> > >> One of the servers I manage has a strange problem. |
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> > >> |
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> > >> Every 24h, someone starts a process shows up as perl in the list, but |
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> > >> launching command is /usr/sbin/httpd. |
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> > >> It shows just one process, but when I run something like this: |
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> > >> |
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> > >> ps -C perl -o cmd,pid |
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> > >> |
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> > >> I get some 5-6 processes alternatively with cmd as /usr/sbin/httpd or |
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> > >> /usr/bin/perl. |
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> > >> |
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> > >> The even more interesting thing is, /usr/sbin/httpd does not exist. |
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> > >> I suspect a rootkit, but chkrootkit & rkhunter reported nothing. |
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> > >> |
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> > >> Also, I found a mysterious file: /tmp/ips.txt with following content: |
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> > >> xxx.xxx.xxx.xxx |
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> > >> 127.0.0.1 |
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> > >> addr:xxx.xxx.xxx.xxx |
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> > >> addr: |
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> > >> addr:127.0.0.1 |
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> > >> addr: |
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> > >> |
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> > >> Somebody is aware of a malware/rootkit which creates such files? |
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> > > |
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> > > I had some of that recently. The attacker used a instance of |
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> phpmyadmin |
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> > > to inject into its URL a wget command to download a perl script from |
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> > > another site. Look for `wget' into apache logs. |
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> > > |
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> > |
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> > @all |
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> > Apache was never installed & I don't see any reason to install it |
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> > because nginx satisfies my needs. I grepped for the string wget in all |
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> > logs and php files, found some, but they were for libssh2 in wordpress |
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> > code. |
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> > @Michael, |
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> > I thought of doing that, but before I discovered the file, I'd already |
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> > killed the processes. Will check later when the process is relaunched |
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> > sometime later. |
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> |
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> You might crank up service log levels in anticipation, too, and prod |
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> your firewall to log unusual-but-allowed connections, too. |
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> |
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|
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I just found something: |
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http://blog.vaultpress.com/2011/08/02/vulnerability-found-in-timthumb/ |
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Data on just one of the wordpress installations seems to be deleted, |
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which seems to me as an effect of this. We're removing timthumb and |
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will watch. Thanks for the tip :-) |
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-- |
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Nilesh Govindarajan |
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http://nileshgr.com |
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