02-24-2017
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.
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LEARN ABOUT FREEBSD
watchdog
WATCHDOG(9) BSD Kernel Developer's Manual WATCHDOG(9)
NAME
watchdog -- software and hardware watchdog facility
SYNOPSIS
#include <sys/watchdog.h>
void
watchdog_fn(void *private, u_int cmd, int *error);
EVENTHANDLER_REGISTER(watchdog_list, watchdog_fn, private, 0);
EVENTHANDLER_DEREGISTER(watchdog_list, eventhandler_tag);
DESCRIPTION
To implement a watchdog in software or hardware, only a single function needs to be written and registered on the global watchdog_list.
The function must examine the cmd argument and act on it as follows:
If cmd is zero, the watchdog must be disabled and the error argument left untouched. If the watchdog cannot be disabled, the error argument
must be set to EOPNOTSUPP.
Else the watchdog should be reset and configured to a timeout of (1 << (cmd & WD_INTERVAL)) nanoseconds or larger and the error argument be
set to zero to signal arming of a watchdog.
If the watchdog cannot be configured to the proposed timeout, it must be disabled and the error argument left as is (to avoid hiding the arm-
ing of another watchdog).
There is no specification of what the watchdog should do when it times out, but a hardware reset or similar ``drastic but certain'' behaviour
is recommended.
SEE ALSO
watchdog(4)
AUTHORS
The watchdog facility and this manual page was written Poul-Henning Kamp <phk@FreeBSD.org>.
BSD
February 28, 2004 BSD