Discover and read the best of Twitter Threads about #AsyncRat

Most recents (3)

🐀 AsyncRAT 🐀 - Defeating Obfuscation Using CyberChef

An overview of some advanced CyberChef tricks for decoding malware

[1/12] 🧵

#AsyncRAT #Decoding #CyberChef #Malware Decoding Decimal Values using cyberchefDecoding String Reverse Using CyberchefDecoding Replace Operations Using CyberChefExample of Using Registers and Regex to perform Replace Oper
[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…
[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 Decimal Encoded Values "chr(45)" etc - Prior to De
Read 12 tweets
(Possible) AsyncRat loader - Interesting regex to decode the obfuscated C2.

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).
[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.
Read 7 tweets
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
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.
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.
Read 25 tweets

Related hashtags

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3.00/month or $30.00/year) and get exclusive features!

Become Premium

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal Become our Patreon

Thank you for your support!