047. Qilin Ransomware Gang Abuses RSAT to Enable Discovery

Hello everyone! Let's talk about one of my favorite topics - ransomware. And yes, one more time - about PowerShell abuse!


Just before ransomware deployment (but in some cases much earlier), adversaries usually need to collect information about remote systems. If you ever responded to a modern ransomware attack, you should have seen this PowerShell commands as seen in Picus report:

"powershell" -Command "Import-Module ActiveDirectory ; Get-ADComputer -Filter * | Select-Object -ExpandProperty DNSHostName"

But what if there is no ActiveDirectory module? Of course, the threat actors try to install it, and it's a great detection opportunity:

"powershell" -Command "ServerManagerCmd.exe -i RSAT-AD-PowerShell ; Install-WindowsFeature RSAT-AD-PowerShell ; Add-WindowsCapability -Online -Name 'RSAT.ActiveDirectory.DS-LDS.Tools~~~~0.0.1.0'"

I think it's obvious how to detect such behaviour - just focus on the module name, that's it.

See you tomorrow!

Comments

Post a Comment

Popular posts from this blog

033. Free Google Threat Intelligence Course

Image
Hello everyone! Everybody loves free courses, right? Have you missed a free course on Google Threat Intelligence ? If the answer is "Yes", it's your chance to check it!  I like this course as it not only overviews the capabilities of Google Threat Intelligence as a product, but also covers various threat intelligence use cases, for example, how to empower incident response and forensic investigations or how to use it for adversary hunting and tracking. I've already got my completion badge: What about you? See you tomorrow!
Read more

001. The Zeltser Challenge

Image
Hello everyone! Happy New Year! New year - new challenges! So, a few weeks ago David Cowen reminded me about the Zeltser challenge. What's the point? You must blog every day for a year to push yourself to research and write. Sound cool, right? Dave suggested to start the challenge with him on 1/1/25, and that's why you are reading this post! So, what am I going to share here? I'm a big fan of intelligence-led approach to cyber defense, so every day we'll look at this or that technique (or sub-technique) leveraged by real adversaries, so we can learn more about our enemies.  We'll look both at public reporting and private findings by BI.ZONE Threat Intelligence team. Stay tuned, and see you tomorrow!
Read more

012. They Want to Know Everything About Your System!

Image
Hello everyone! Today we'll look at reconnaissance techniques leveraged by Secret Blizzard (also known as Turla) as seen in the report by Microsoft Threat Intelligence.  In this campaign Secret Blizzard used the Amadey bot to download its own backdoors to specifically selected target devices associated with the Ukrainian military. So, one of the batch scripts leveraged by adversary invoked lots of reconnaissance commands. Let's look at each of them: ver - to collect information about OS version; systeminfo - to collect compromised system information; ipconfig /all - to collect the full TCP/IP configuration for all adapters; ipconfig /displaydns - to collect the contents of the DNS client resolver cache; route print - to collect the entries in the local IP routing table; arp -a - to collect information on current arp cache tables for all interfaces; netstat -a -n - to collect information on active network connections; net share - to collect information on ...
Read more