(Lazy) Sunday Maldoc Analysis: A Bit More ...
At the end of my diary entry "(Lazy) Sunday Maldoc Analysis", I wrote that there was something unusal about this document.
Let's take a look at the content of the file and compare that with the file size:
A rough estimate: the total size of the streams is 120 kB. While the file size is around 10 MB. That's a huge difference!
In such cases, I take a look with olemap:
Here I can see that there is extra data appended to the file (position 0x25400) and it's about 10 MB in size.
Extracting the appended data and calculating some statistics gives me:
This tells me there's about 10 MB of 0x00 bytes appended.
Was this done by the malware authors? Or did it happen later, during transmission or storage?
I don't know.
Maybe it was done to bypass scanning, for example when there is a size-limit for files to be scanned. Just speculating ...
Please post a comment if you have an idea.
Didier Stevens
Senior handler
Microsoft MVP
blog.DidierStevens.com DidierStevensLabs.com
Comments
www
Nov 17th 2022
4 months ago
EEW
Nov 17th 2022
4 months ago
qwq
Nov 17th 2022
4 months ago
mashood
Nov 17th 2022
4 months ago
isc.sans.edu
Nov 23rd 2022
4 months ago
isc.sans.edu
Nov 23rd 2022
4 months ago
isc.sans.edu
Dec 3rd 2022
3 months ago
isc.sans.edu
Dec 3rd 2022
3 months ago
<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure. The social networks are not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go.
<a hreaf="https://technolytical.com/">the social network</a> is not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go. The social networks only collect the minimum amount of information required for the service that they provide. Your personal information is kept private, and is never shared with other companies without your permission
isc.sans.edu
Dec 26th 2022
3 months ago
isc.sans.edu
Dec 26th 2022
3 months ago