Category Archives: Incident Response

Investigating Certificate Template Enrollment Attacks – (ADCS)

Active Directory Certificate Services (ADSCS) is Microsoft’s Public Key Infrastructure (PKI) for typical Windows environments. There has been lots of blog posts on how to compromise an entire ADCS infrastructure, so I don’t want to repeat the same stuff over and over again. However, since ADCS is now a clear target with all the POCs that are available, and so

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Hunting and Responding to ProxyShell Attacks

ProxyShell is an attack chain that exploits three known vulnerabilities in On-Premises Exchange servers: CVE-2021-34473, CVE-2021-34523 and CVE-2021-31207. ProxyShell allows a remote unauthenticated attacker to execute arbitrary commands on an unpatched Exchange Server through port 443. The bug relies in the Client Access Service (CAS) component in Exchange and was discovered by a security researcher in 2021. The presentation of

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Hunting Webshell Activity

A Webshell is a malicious script that an attacker can drop on a webserver to launch additional attacks and establish persistence. Before a Webshell is dropped, it is usually the case that an attacker has successfully obtained SYSTEM level access on the targeted server in order to upload the Webshell. A Webshell may provide a set of functions to execute

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What I have learned from doing a year of Cloud Forensics in Azure AD

Today I would like to share my experience with doing Cloud forensics in Azure AD. I’ve been working for over a year with Azure Active Directory, and have primary focused on the different security aspects of it. One of my main focus has been doing Cloud forensics, which I will tell more about. I was always interested in understanding, where

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Why are Windows Defender AV logs so important and how to monitor them with Azure Sentinel?

Today we are going to talk about our good old friend or better known as Windows Defender AV. Not to confuse with the EDR solution that’s called ”Defender for Endpoint”. Windows Defender is the traditional out of the box antivirus for a Windows machine. In this blog post, we are going to explain why it is relevant to keep an

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Exfiltrating data by transfering it to the cloud with Azcopy

During the past year, we have seen ransomware gangs using public tools to exfiltrate data by copying it to an array of a Cloud storage provider. In November 2020, SentinelOne discovered, that adversaries were using such techniques to transfer data from a victim’s machine to a Cloud storage provider. The blog post of SentinelOne can be found here. Where they

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