PS is not showing all processes owned by a user
Ofloo
bulk at ofloo.net
Wed May 30 18:38:09 UTC 2007
Chuck Swiger-2 wrote:
>
> Ofloo wrote:
>> Can someone explain me this !?
>>
>> spark# ps aux | grep psybnc | grep s00p
>> s00p 8777 0.0 0.3 43096 5716 p1- S Fri06PM 4:30.25
>> ./psybnc
>>
>> spark# su s00p
>> -(s00p at spark.ofloo.net)-(19:56:45)
>> -(~/)-> ps aux
>> USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
>> s00p 67431 4.0 0.1 4660 2828 pd S 7:56PM 0:00.05 _su (tcsh)
>> s00p 67438 0.0 0.0 1420 908 pd R+ 7:56PM 0:00.00 ps aux
>
> psybnc is an IRC relay agent; unless someone normally runs such things,
> having
> one of these processes appear but be "invisible" to top or normal
> invocations
> of ps is a possible indication that the system has been hacked.
>
> A typical pattern involves a user having their account password sniffed
> via
> wireless when reading email or whatever, and the attacker gains shell
> access
> to their email server (assuming it's a Unix system), and runs this. It
> includes a generic remote filesharing capability and some kind of port
> redirector ala netcat or SSH port forwarding, so the hacked machine can be
> used as a remote control channel to drive other compromised machines...
>
>> This came after a complaint from the user, who couldn't kill his process,
>> because it wasn't visible in his session, and he didn't su !?
>
> However, I'm not sure whether the above is relevant, if your user was
> trying
> to run this IRC agent. :-)
>
> --
> -Chuck
>
>
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>
No hacker would want to hide a process from a user it might want to hide a
process from root user. Also if the hacker was able to hide a process from a
user, it would of needed access to ps binary or freebsd source tree on that
system, having that access the hacker would of tried other things and not
hide a bnc from just a user account.
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