Category: Computers
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Introducing Invoke-EncryptionSimulator: A PowerShell Tool for Simulating Late-Stage Ransomware Attacks
Invoke-EncryptionSimulator Invoke-EncryptionSimulator is designed to be a simple and safe way to emulate the encryption stage of a ransomware deployment to aid in development and testing of controls focusing on file system level changes rather than process related telemetry. Invoke-EncryptionSimulator is designed to be a simple and safe way to emulate the encryption stage of…
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Analyzing & Detecting IIS Backdoors
IIS Extensions As Backdoors Microsoft recently published an interesting blog explaining how they’ve noticed a new trend where attackers have been leveraging Internet Information Services (IIS) extensions to covertly backdoor Windows servers: https://www.microsoft.com/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/ The Microsoft post contains a wealth of information on this topic, but I really wanted to dig through the specifics in order…
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New Tool! Invoke-RPCMap: PowerShell Script for Remote RPC Service Enumeration
Invoke-RPCMap Invoke-RPCMap can be used to enumerate local and remote RPC services/ports via the RPC Endpoint Mapper service. This information can useful during an investigation where a connection to a remote port is known, but the service is running under a generic process like svchost.exe. This script will do the following: Create a local log…
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Revisiting & Revising An Old PowerShell Tool – Quickly Find The Largest Files
A few years ago I wrote a script to help find the largest files on a drive using PowerShell without the need to install any additional software. This script was extremely useful for quickly narrowing in on files that may be easy to remove in order to help free up disk space, particularly in situations…
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VMware vCenter CVE-2021-21972 Scanner
In this post, I am releasing a PowerShell POC script that will scan the specified target hosts and attempt to detect those that are vulnerable to VMware vCenter CVE-2021-21972. You can find the script, Invoke-CVE-2021-21972-Scan.ps1, on my github here: https://github.com/robwillisinfo/VMware_vCenter_CVE-2021-21972 The script executes in the following order: Create a log file, default log name is…
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Defending Against PowerShell Attacks
It’s no secret that I am a big fan of PowerShell and recently I have been spending a considerable amount of time researching and testing it from a security perspective. While there is a lot of solid information out there, I have found it can still be a challenge to really get a solid grasp…
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Invoke-Decoder – A PowerShell script to decode/deobfuscate malware samples
I have been spending a lot of time reviewing PowerShell based attacks and malware over the last few months and I wanted to take some time to really understand how some of the common obfuscation techniques really work under the hood. The best way for me to learn more about something like this is to…
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Disabling PowerShell v2 with Group Policy
In this post I am going to tackle something that I have been wanting to play around with for awhile, disabling PowerShell v2 at an enterprise scale. As a former systems engineer and now a security engineer, I have a love/hate relationship with PowerShell since it is amazingly useful but also incredibly dangerous in the…
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Everything You Need To Know To Get Started Logging PowerShell
Intro Recently, I have been spending a lot of time researching and working with PowerShell logging. Since PowerShell is readily available (built-in to the OS) and has an assortment of functionality that can be used across the entire kill chain right out of the box, it is an ideal candidate for virtually any type of…
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Dell XPS 15 9570 – Thermal Mods
I have always been a big fan of Dell hardware from their laptops to servers. Two things always seem to remain the same with Dell, you can get a considerable amount of performance bang for the buck and their hardware is generally easy to work on. So about 6 months ago, I was looking for…
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