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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sieveshell

SIEVESHELL(1)						User Contributed Perl Documentation					     SIEVESHELL(1)

NAME

       sieveshell - remotely manipulate sieve scripts

SYNOPSIS

       sieveshell [--user=user] [--authname=authname] [--realm=realm] [--exec=script] server[:port]

       sieveshell --help

DESCRIPTION

       sieveshell allows users to manipulate their scripts on a remote server.	It works via MANAGESIEVE, a work in progress.

       The following commands are recognized:

	   list list scripts on server.

	   put <filename> upload script to server.

	   get <name> [<filename>] get script. if no filename display to stdout

	   delete <name> delete script.

	   activate <name> activate script.

	   deactivate deactivate all scripts.

OPTIONS

       -u user, --user=user
	   The authorization name to request; by default, derived from the authentication credentials.

       -a authname, --authname=authname
	   The user to use for authentication (defaults to current user).

       -r realm, --realm=realm
	   The realm to attempt authentication in.

       -e script, --exec=script
	   Instead of working interactively, run commands from script, and exit when done.

REFERENCES

       [MANAGESIEVE] Martin, T.; "A Protocol for Remotely Managing Sieve Scripts", draft-ietf-managesieve-03.txt, Mirapoint, Inc.; May 2001, work
       in progress.

AUTHOR

       Tim Martin <tmartin@mirapoint.com>, and the rest of the Cyrus team <cyrus-bugs@andrew.cmu.edu>.

perl v5.16.3							    2014-06-10							     SIEVESHELL(1)