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forensics/basic-forensic-methodology/docker-forensics.md
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@ -49,11 +49,13 @@ docker exec -it wordpress bash
## Images modifications
When you are given an exported docker image \(probably in `.tar` format\) you can use the following command to **extract the modifications**:
When you are given an exported docker image \(probably in `.tar` format\) you can use [**container-diff**](https://github.com/GoogleContainerTools/container-diff/releases) to **extract a summary of the modifications**:
```bash
docker save <image> > image.tar #Export the image to a .tar file
container-diff analyze -t sizelayer image.tar
container-diff analyze -t history image.tar
container-diff analyze -t metadata image.tar
```
Then, you can **decompress** the image and **access the blobs** to search for suspicious files you may have found in the changes history:
@ -62,12 +64,27 @@ Then, you can **decompress** the image and **access the blobs** to search for su
tar -xf image.tar
```
In order to find added/modified files in docker images you can also use the [**dive**](https://github.com/wagoodman/dive) utility:
In order to find added/modified files in docker images you can also use the [**dive**](https://github.com/wagoodman/dive) ****\(download it from [**releases**](https://github.com/wagoodman/dive/releases/tag/v0.10.0)\) utility:
![](../../.gitbook/assets/image%20%28425%29.png)
```bash
#First you need to load the image in your docker repo
sudo docker load < image.tar 1 ⨯
Loaded image: flask:latest
#And then open it with dive:
sudo dive flask:latest
```
This allow you to **navigate through the different blobs of docker images** and check which files were modified/added. **Red** means added and **yellow** means modified. Use **tab** to move to the other view and **space** to to collapse/open folders.
With die you won't be able to access the content of the different stages of the image. To do so you will need to **decompress each layer and access it**.
You can decompress all the layers from an image from the directory where the image was decompressed executing:
```bash
tar -xf image.tar
for d in `find * -maxdepth 0 -type d`; do cd $d; tar -xf ./layer.tar; cd ..; done
```
## Credentials from memory
Note that when you run a docker container inside a host **you can see the processes running on the container from the host** just running `ps -ef`