3.8 KiB
3.8 KiB
Malware analysis on Gorgon APT campaign (23-08-19)
Table of Contents
Malware-analysis
Initial vector
Use a document with a macro as initial vector. On the code of the macro, some functions with differents names are used with the same code inside for obfuscate and make more harder the analysis.
Use in more at the function, strReverse for reverse the data. Finally, combine it and execute it with a Shell request.
This use mshta command for download and execute the external content. The bitly URL go on the pastebin share and is the first stage.
First stage
The first stage executed on the computer is a js script who use nested unescape (3 times).
At the 3th layer, we can see a vb script using some obfuscating methods (StrReverse, splited variables, multiples Wscript objects)
Finally, the script kills the word, excel, publisher and powerpoint instances, add a persistence for re-executes this script for reinfecting the computer and create two schedule task for the second stage and close the hidden window. The persistence by Run key can look like useless but it used like an updating vector for change the TTPs or executing a kill switch on the operation.
Second stage
The first pastebin use too a js script with with 3 layers of unescape and the previous obfuscating methods.
References MITRE ATT&CK Matrix
List of all the references with MITRE ATT&CK Matrix
| Enterprise tactics | Technics used | Ref URL |
|---|---|---|
Indicators Of Compromise (IOC)
List of all the Indicators Of Compromise (IOC)
| Indicator | Description |
|---|---|
| IP C2 | |
| http[:]// | URL request |
| Domain C2 |
This can be exported as JSON format Export in JSON
Links
- Original tweet: https://twitter.com/Rmy_Reserve/status/1164405054746460161
- Anyrun Link: IMG76329797.xls
- Docs : Gorgon analysis by Unit42