Defence
You never know what you will find when you go hunting! So here’s a quick tale of an explore I did using Advanced Hunting!
I went hunting here in Advanced Hunting:
Read more “Threat hunting with some funny results!”
Uncategorized
A common way to deploy an encryption routine used in Ransomware scenarios is to create a scheduled task to launch a cyptor exe. This is commonly deployed via a Group Policy Object (GPO).
So I wanted to look at how with Microsoft Defender for Endpoint (MDE) we could detect this both on domain controllers but also on CLIENT devices (MEMBER SERVERS/PCs)
Read more “Hunting for New Group Policies Where Scheduled Tasks are used”
Guides
If you are having fun today with Defender ASR deleting lnk files then you will see the MS Script has a v1.1 which looks to VSS to see if it can restore shortcuts from shadow copies, so whilst here I thought I’d note down a few different ways to list the Volume Shadow Copies.
You will need admin rights for these to work:
Read more “Volume Shadow Copy”
Defense
This is a big thing in the Exchange world from my POV! I believe this is dropping sometime today (28th September!)
Exchange OWA, ECP etc. are exposed online not only for mailbox access, calendar sharing but also are a requirement for hybrid mode sync capabilities.
Vulnerabilities in Exchange this year (ProxyLogon/ProxyShell) have shown how problematic an attack surface this is. The good news is, Microsoft have created a feature for Exchange to help mitigate these attacks in the future via the EM Service!
Read more “Exchange Emergency Mitigation Service with new CU Update”
Defense
Ok so the other day “we” as a community put out some guidance around post active directory compromise actions for when you can’t simply nuke the forest from orbit. Well, following on from that a friend asked about how to restore AdminSDHolder permissions? Read more “How to restore AdminSDHolder Object Permissions using ADSIedit”
Defense
Recently I decided to do the Red Team Operator: Privilege Escalation in Windows Course by Sektor7 (thanks for the recommendation Justin!). I thought I’d write some notes but also create a quick blog covering some of the Windows fundamental areas. It’s easy to actually forget how this stuff is at a detailed level so figured it helps both myself and the world to share a snippet. I’m litterally listening to the course as I type this, I’ve just imported an OVA to vmware workstation so this is litterally live! (I’m 7 video modules in!)
There’s some key parts around Windows Security Architecture that is important to know, the course does cover this off at the start so I thought I’d share a tiny bit of my notes. Read more “Windows Security Fundamentals & LPE”
Defense
Only admins can use PowerShell, right? Wrong! In Office 365 and Azure AD standard users can connect using PowerShell.
In this quick post we are going to look at how to disable users from being able to read other users data using the MSOL cmdlets. (this also appears to limit AzureAD cmdlets access as well)
Run the following command as a global admin: Read more “Hardening Office 365 PowerShell Access”
Defense
Ok so John and I have been working on this for a while. We have been working with both customers and industry profesionals and there’s a common theme. Understranding the events from this incident are quite challenging because:
Getting guidance out so far on this has been challenging becuase:
So to try and help people we have made a diagram which we will update as we go.
Essentially you need to perform a weighted analysis to understand if: