Malicious perl script Post: 302992322

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Operating Systems Linux Debian Malicious perl script Post 302992322 by drysdalk on Thursday 23rd of February 2017 05:28:52 PM

02-23-2017

Registered User

Hello,

When I'm trying to track down rogue processes on a Linux system, I find the /proc filesystem valuable. If you have full shell access (and it seems you do), and the rogue Perl process is still running with PID 4600 (or if you can see what its current PID is), try doing ls -l /proc/4600 and ls -l /proc/4600/fd/. This might reveal something of the directory that the underlying process is stored in, or at least give you some clues.

In that 'top' listing, I also have to say I don't much like the look of PIDs 4599, 4334 and 4552. Basically you should pay close attention to any process that's owned by the user 'apache' but claims to be anything other than 'httpd'.

---------- Post updated at 10:28 PM ---------- Previous update was at 10:25 PM ----------

Hi,

Also, one other quick thought - have a good look through /tmp, /var/tmp and /var/run. Especially look for hidden files (files whose name starts with a dot) by means of ls -a . The '-a' flag shows such files in a directory listing, and can be combined with other flags such as '-l'.

drysdalk

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LEARN ABOUT NETBSD

swwdog

SWWDOG(4)						   BSD Kernel Interfaces Manual 						 SWWDOG(4)

NAME

     swwdog -- software watchdog timer

SYNOPSIS

     pseudo-device swwdog

DESCRIPTION

     The swwdog driver provides a software watchdog timer that works with wdogctl(8).  If the timer expires, the system reboots if the boolean
     variable swwdog_reboot is true; otherwise, the system will panic.	swwdog_reboot is accessible as a sysctl(8) variable, hw.swwdog.reboot and
     defaults to false.

     The default period of swwdog is 60 seconds.

     As with other watchdog timers, the swwdog driver prevents a system from suspending when the watchdog is armed.

SEE ALSO

     sysctl(8), wdogctl(8)

HISTORY

     The swwdog driver was written by Steven M. Bellovin.

BUGS

     Only one watchdog timer can be active at any given time.  (Arguably, this is a bug in the watchdog timer framework.)  Therefore, only a sin-
     gle instance of the swwdog device can be created.

     Kernel tickle mode is useless with swwdog and arguably should be rejected, since both it and this driver rely on the same callout mechanism;
     if one is blocked, almost certainly the other is as well.

     The alarm option to wdogctl(8) isn't implemented.

BSD
								   June 8, 2011 							       BSD