Malicious perl script Post: 302992369

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Operating Systems Linux Debian Malicious perl script Post 302992369 by drysdalk on Friday 24th of February 2017 08:32:55 AM

02-24-2017

Registered User

Hi,

It certainly sounds like you've been sensible in how you've set up WordPress, from what you describe. And whilst it would be possible to conceal a malicious script in an image, this isn't commonly seen, and tends to be a result of far more subtle and advanced compromises than what you appear to be experiencing.

The main thing I suggest right now is to see if there are still any suspicious processes on your system at the moment. If there are, then you need to find out as much as you can about them before they exit or are killed off. If there aren't, then your next best avenue of investigation would be to look at your Web server logs for anything that appears out-of-the-ordinary.

On a Plesk-style system (if that is indeed what you have), these are typically stored as /var/www/vhosts/domain.com/logs/access_log, where domain.com should of course be replaced with your own Web site's domain. If it's a WordPress site, then any mention of the Perl interpreter or Perl scripts in those logs would constitute an abnormal finding.

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)