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🐀 AsyncRAT 🐀 - Defeating Obfuscation Using CyberChef
An overview of some advanced CyberChef tricks for decoding malware
[1/12] 🧵
#AsyncRAT #Decoding #CyberChef #Malware
An overview of some advanced CyberChef tricks for decoding malware
[1/12] 🧵
#AsyncRAT #Decoding #CyberChef #Malware
[2/] First, some links if you wish to follow along.
The Malware File: bazaar.abuse.ch/sample/26c9f29…
Links to CyberChef Recipes:
github.com/embee-research…
The Malware File: bazaar.abuse.ch/sample/26c9f29…
Links to CyberChef Recipes:
github.com/embee-research…
[3] Decimal Values:
Some text is converted to decimal to hinder simple text based analysis.
To defeat:
- Subsection - This grabs encoded data without removing the rest of the script
- Regex - Grab the decimal and ignore the "chr" junk
- From Decimal - Decode the decimal
Some text is converted to decimal to hinder simple text based analysis.
To defeat:
- Subsection - This grabs encoded data without removing the rest of the script
- Regex - Grab the decimal and ignore the "chr" junk
- From Decimal - Decode the decimal
(Possible) AsyncRat loader - Interesting regex to decode the obfuscated C2.
Script was found on host with an active #AsyncRat infection.
#malware #regex #decoding
Script was found on host with an active #AsyncRat infection.
#malware #regex #decoding
[1/6] The team at @HuntressLabs are still observing IronPython executables used to load #malware.
In these cases - IronPython (ipyw.exe) file is typically renamed to SupportTool.exe or Ctfmon.exe
Since ipyw.exe is "legitimate", the VT detection rate is very low (0/72).
In these cases - IronPython (ipyw.exe) file is typically renamed to SupportTool.exe or Ctfmon.exe
Since ipyw.exe is "legitimate", the VT detection rate is very low (0/72).
[2/6] The "update.py" is where the malicious action starts.
This is usually a simple python file containing an additional obfuscated script.
Below you can see this decoded via #CyberChef.
This is usually a simple python file containing an additional obfuscated script.
Below you can see this decoded via #CyberChef.
1/ #ThreatHunting for #AsyncRAT
We have various ways to find infected hosts with AsyncRAT:
1⃣ Usage of standard C2 ports
2⃣Hunting for persistence
3⃣Mutexes FTW
4⃣Last but not least, hunting for dropped DLLs
Let's go 🤠🧵
#CyberSecurity
We have various ways to find infected hosts with AsyncRAT:
1⃣ Usage of standard C2 ports
2⃣Hunting for persistence
3⃣Mutexes FTW
4⃣Last but not least, hunting for dropped DLLs
Let's go 🤠🧵
#CyberSecurity
2/ AsyncRAT is a popular Trojan executed at the end of an infection chain on target computers.
@hpsecurity ([2],[3]) and @Trellix ([4]) have both reported in recent reports that TAs have been deploying AsyncRAT.
@hpsecurity ([2],[3]) and @Trellix ([4]) have both reported in recent reports that TAs have been deploying AsyncRAT.
3/ Since the source code of AsyncRAT is publicly available [1], we can obtain a copy to investigate and build detection capabilities for this RAT.
