Timeline analysis preparation (Linux IR)

Before starting this lab, we need to first mount the image.

See my this blog:

https://mahimfiroj.blogspot.com/2026/08/disk-acquisition-and-access.html

Step 1: Creating working directories.

mkdir -p /images/case

cd /images/case

Now you need to confirm that the image is already mounted. See the above blog post.

Step 2: Creating body files.

fls is a tool from sleuthkit.

apt install sleuthkit -y

Root filesystem (LVM):

fls -r -m / /dev/VulnOSv2-vg/root | gzip > bodyfile-root.gz

Boot / other raw partitions (offset required):

fls -r -m /boot -o 2048 /mnt/case/img/ewf1 | gzip > bodyfile-boot.gz

-r for recursive and -m for mount point, -o for offset. gz is done to save the space.

Step 3: Building filtered timeline.

zcat bodyfile-* | mactime -d <YYYY-MM-DD> | grep -v deleted-realloc > timeline.csv

wc -l timeline.csv

3327 timeline.csv

Another Way of doing this:

fls -r -m "/" /media/Avi/USB/yamato.raw > timeline.body (This file name and extension does not need to be same, you can specify whatever you want)

mactime -b timeline.body -d -y > timeline.csv

We can also specify date range in the mactime command:

There is another way that we can follow to create the timeline.csv directory from the vmdk file.

We need psteal.py tool for that. But this tool is a part of plaso/log2timeline tool.

https://github.com/log2timeline/plaso/blob/main/plaso/cli/psteal_tool.py (How to install this tool you can see 13cubed video)

Installation for ubuntu: (https://plaso.readthedocs.io/en/latest/sources/user/Ubuntu-Packaged-Release.html)

sudo add-apt-repository universe

sudo add-apt-repository ppa:gift/stable

sudo apt update

sudo apt install plaso-tools

psteal.py --source tomcatdec-flat.vmdk -w timeline.csv (We may use .dd or .raw image as well)

Now you will get a prompt.

After sometime, it should create the timeline.csv file.

Avi

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