Malicious perl script Post: 302992395

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Operating Systems Linux Debian Malicious perl script Post 302992395 by drysdalk on Friday 24th of February 2017 11:33:08 AM

02-24-2017

Registered User

Hi,

I suspect these are two different issues. So far you have seen evidence of attempted brute-forcing of your WordPress logins, and you also saw a Perl script establishing a variety of outbound SMTP connections back at the very start of this thread.

It is entirely possible that the two are related, but equally they may not be. There's always a steady trickle of would-be brute-forcing and exploit scanning in the logs of pretty much every Web server on the Internet, more or less. If your WordPress installation is genuinely secure, these should be nothing to worry about. More sinister is the Perl script.

If in the output of ps and top right now you're not able to see any errant Perl scripts, and if there is nothing Perl-related in any of your Web logs, then there's not much more you can do at this point to track down that Perl script.

What you can say for sure is that your server was clearly running an unexpected Perl script that appeared to be establishing a variety of outbound SMTP connections, and it must have come from somewhere. And if that somewhere wasn't you, then you do definitely have a security issue you still need to get to the bottom of.

drysdalk

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ip2host

IP2HOST(1)						User Contributed Perl Documentation						IP2HOST(1)

NAME

	 ip2host - Resolves IPs to hostnames in web server logs

SYNOPSIS

	 ip2host [OPTIONS] [cache_file] < infile > outfile

	 infile  - Web server log file.

	 outfile - Same as input file, but with IPs resolved to hostnames.

	 Options:

	 --children=...  Number of child processes to spawn (default: 40)
	 --timeout=...	 Seconds to wait on DNS response (default: 20)
	 --buffer=...	 Maximum number of log lines to keep in
			 memory (default: 50000)
	 --flush=...	 Number of lines to process before flushing
			 output buffer (default: 500)
	 --cache=...	 Filename to use as disk cache (default: none)
	 --ttl=...	 Number of seconds before IPs cached on disk are expired
			 (default: 604800 - One week)

DESCRIPTION

       This is a faster, drop-in replacement for the logresolve utility distributed with the Apache web server.

       It's been reported to work under Linux, FreeBSD, Solaris, Tru64, and IRIX.

AUTHOR

       Maurice Aubrey <maurice.aubrey+ip2host@gmail.com>

       Based on the logresolve.pl script by Rob Hartill.

COPYRIGHT

       Copyright 1999-2007, Maurice Aubrey <maurice.aubrey+ip2host@gmail.com>.

       This module is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

README

       Resolves IPs to hostnames in web server logs.  This is a faster, drop-in replacement for the logresolve utility distributed with the Apache
       web server.

SCRIPT CATEGORIES

       Web

perl v5.14.2							    2012-02-15								IP2HOST(1)