Using the Cobalt Strike Integrations tool, users can patch a custom OST UDRL onto a Beacon payload.

Analyzing Cobalt Strike for Fun and Profit. Challenge Blue Teams and measure incident response with. Cobalt Strike’s post-exploitation agents and collaboration capabilities ensure effective Adversary Simulations and Red Team operations. SUPPLY CHAIN ANALYSIS: From Quartermaster to SunshopFireEye. Cobalt Strike is a threat emulation tool, ideal for mimicking an advanced, stealthy threat actor that’s been embedded in an IT environment long-term.

UDRLs are a prime example of this collaboration. A Multi-Method Approach to Identifying Rogue Cobalt Strike Servers. With the acquisition of Outflank in 2022, the development teams of OST and Cobalt Strike have begun to work together to more closely align the two products. OST is an advanced red teaming toolset that offers numerous offensive tools and tradecraft, many of which can be used with Cobalt Strike. Integrating Outflank Security Tooling (OST) and Cobalt Strike with UDRLs If you’ve developed a UDRL for Cobalt Strike yourself and you’d like to share, you can submit it for review. These are available to download in the Community Kit, a curated central repository of UDRLs and other extensions written by the user community to extend the capabilities of Cobalt Strike. Given the popularity of UDRLs and the collaborative nature of the Cobalt Strike community, some UDRLs have been made publicly available – notably AceLdr, TitanLdr and BokuLoader. To further support prepend-style UDRLs, Beacon was updated so it can be used without the exported reflective loader function.Ī blog series has been created to provide comprehensive guidance on UDRL development. A new Aggressor Script hook was added to replace the default reflective loader in order to add support for prepend-style UDRLs using post-exploitation DLLs. The UDRL was further expanded in version 4.9. This included increasing the size capacity of the loader and ensuring the artifact kit permitted customized sizing so that larger UDRLs had enough space. Watch the Cobalt Strike trailer to get a taste of Cobalt Strike. Now that you’ve met Cobalt Strike, here are the next steps: 1. The UDRL is a primary feature of Cobalt Strike and updates were made in 4.5 to expand its capabilities. Cobalt Strike adds client-side reconnaissance, spear phishing, web drive-by attacks, and reporting to Armitage’s red team collaboration and post-exploitation capabilities. For example, Outflank’s Kyle Avery developed a AceLDR, a UDRL designed to evade memory scanners. UDRLs are particularly helpful for increasing the evasiveness of Beacon by allowing you to use a loader that works for you, rather than being constrained by the default loader. UDRLs are a way for operators to write their own reflective loader, bringing their own tradecraft to bear. What is the User-Defined Reflective Loader (UDRL)?

Cobalt strike capabilities