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41023 27118 27130 28208 27223 243096 243096 243096 135671 STR
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Line 14 shows that the lpset process is accessing the network via a raw socket; hme is the 10/100 Ethernet card on a Sparc (Seeing le here would suggest a process is accessing a 10Mbps Ethernet card) Notice in line 13 that the process lpset has opened file descriptor 3 for writing, and the file is 210,185,501 bytes in size That s a pretty big file What do you think it is Now, all you need to do is find the 210MB file to confirm that it is a sniffer log A ps command on the victim Solaris server reveals where you could find the sniffer log:
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root 648 1 0 Sep 16 51:24 /usr/lib/lpset -s -o /dev/ttyt/snl
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From this output, you can guess that the sniffer program is located in the /usr/lib directory and that the output file is named /dev/ttyt/sn1 The next step is to record the time/date stamps on the system, then transfer the suspected sniffer log to your forensic workstation using trusted dd, des, and netcat commands:
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dd if=/dev/ttyt/sn1 | des e c k password | nc w 3 19216810210 2222
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Make sure that the forensic workstation is receiving the connections on port 2222 and storing the data it is receiving by using the following command:
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nc l p 2222 | des d c k password | dd of=sn1
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This command creates a file called sn1 on the forensics station You can document where you obtained the file by recording the output of an ls -al command on the full pathname of the file
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Reviewing the /Proc File System
The /proc file system is a pseudo-file system that is used as an interface to kernel data structures on some Unix flavors By changing directories into /proc, you are really accessing kernel data structures, not a true directory Each process has a subdirectory in /proc that corresponds to its PID Therefore, each running process will have a numerical subdirectory structure Within this directory is vital process information that an investigator will want to review The following illustrates the directory contents for a process called /root/ir/lo executed on a Linux system:
[root@conan]# /root/ir/lo [1] 969
We execute a process called /root/ir/lo We then execute a ps command to obtain the PID for /root/ir/lo:
[root@conan]# ps -aux | grep /root/ir/lo USER PID %CPU %MEM VSZ RSS TTY STAT START root 970 00 04 872 312 S 20:12 root 972 00 16 2668 1016 pts/4 R 20:12 TIME COMMAND 0:00 /root/ir/lo 0:00 grep
The /root/ir/lo program is PID 970 We change directories to the /proc/970 directory to review the contents:
[root@conan]# cd /proc/970 [root@conan 970]# ls al total 0 dr-xr-xr-x 3 root root dr-xr-xr-x 61 root root -r--r--r-1 root root lrwx-----1 root root -r-------1 root root lrwx-----1 root root dr-x-----2 root root pr--r--r-1 root root -rw------1 root root lrwx-----1 root root -r--r--r-1 root root -r--r--r-1 root root -r--r--r-1 root root
0 0 0 0 0 0 0 0 0 0 0 0 0
Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr
5 5 5 5 5 5 5 5 5 5 5 5 5
20:12 13:52 20:12 20:12 20:12 20:12 20:12 20:12 20:12 20:12 20:12 20:12 20:12
cmdline cwd -> /tmp environ exe -> /root/ir/lo fd maps mem root -> / stat statm status
The features with the most investigative significance are the exe link, the fd subdirectory, and the cmdline file
6:
Live Data Collection from Unix Systems
The Exe Link in the /Proc File System
The exe link allows investigators to recover deleted files as long as they are still running For example, suppose that you issue the following commands:
[root@conan 970]# rm /root/ir/lo rm: remove `/root/ir/lo y
The /root/ir/lo program is unlinked from the file system An ls command in the /root/ir directory will not show the lo program on the file system However, when you review the contents of the /proc/970 directory, you see this output (again, the line numbers were added for this discussion):
[root@conan 970]# ls -al 1) total 0 2) dr-xr-xr-x 3 root 3) dr-xr-xr-x 60 root 4) -r--r--r-1 root 5) lrwx-----1 root 6) -r-------1 root 7) lrwx-----1 root (deleted) 8) dr-x-----2 root 9) pr--r--r-1 root 10) -rw------1 root 11) lrwx-----1 root 12) -r--r--r-1 root 13) -r--r--r-1 root 14) -r--r--r-1 root
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