Package: chkrootkit
Version: 0.48-5
Severity: normal

Run
# while true; do find /proc >/dev/null; done&

and /usr/lib/chkrootkit/chkproc will report hidden processes:
You have    17 process hidden for readdir command
You have    17 process hidden for ps command

and chkrootkit will suspect an LKM Trojan running (not every time, however).
This is what I sometimes receive from the cron job:

You have     2 process hidden for readdir command
You have     2 process hidden for ps command
chkproc: Warning: Possible LKM Trojan installed

See also
http://linux.derkeiler.com/Mailing-Lists/Fedora/2008-05/msg01397.html

-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (900, 'testing'), (100, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 2.6.26-1-686 (SMP w/1 CPU core)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages chkrootkit depends on:
ii  binutils            2.18.1~cvs20080103-7 The GNU assembler, linker and bina
ii  debconf [debconf-2. 1.5.22               Debian configuration management sy
ii  libc6               2.7-13               GNU C Library: Shared libraries
ii  net-tools           1.60-19              The NET-3 networking toolkit
ii  procps              1:3.2.7-8            /proc file system utilities

chkrootkit recommends no packages.

chkrootkit suggests no packages.

-- debconf information:
* chkrootkit/run_daily: true
* chkrootkit/run_daily_opts: -q
* chkrootkit/diff_mode: false



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