Resources

Revisiting the User-Defined Reflective Loader Part 2: Obfuscation and Masking

This is the second installment in a series revisiting the User-Defined Reflective Loader (UDRL). In part one, we aimed to simplify the development and debugging

Blog

Simplifying BOF Development: Debug, Test, and Save Your B(e)acon

Beacon Object Files (BOFs) were introduced in Cobalt Strike 4.1 in 2020. Since their release, BOFs have played a key role in post-exploitation activities, surpassing

Blog

Cobalt Strike and Outflank Security Tooling: Friends in Evasive Places

This is a joint blog written by the Cobalt Strike and Outflank teams. It is also available on the Outflank site. Over the past few months

Video

Cobalt Strike Introduction and Demo

Cobalt Strike helps organizations conduct advanced adversary simulations and Red Team engagements with ease, allowing your organization to effectively measure your security operations program and

Blog

Cobalt Strike and YARA: Can I Have Your Signature?

Over the past few years, there has been a massive proliferation of YARA signatures for Beacon. We know from conversations with our customers that this

Blog

Stopping Cybercriminals From Abusing Security Tools

Microsoft’s Digital Crimes Unit (DCU), cybersecurity software company Fortra™ and Health Information Sharing and Analysis Center (Health-ISAC) are taking technical and legal action to disrupt

Blog

Cobalt Strike 2023 Roadmap and Strategy Update

I blogged about the Cobalt Strike roadmap in March last year and while the fundamental tenets of our approach to R&D remain unaltered, a lot

Blog

Revisiting the User-Defined Reflective Loader Part 1: Simplifying Development

This blog post accompanies a new addition to the Arsenal Kit – The User-Defined Reflective Loader Visual Studio (UDRL-VS). Over the past few months, we

Blog

Cobalt Strike 4.8: (System) Call Me Maybe

Cobalt Strike 4.8 is now available. This release sees support for system calls, options to specify payload guardrails, a new token store, and more. We

Blog

Behind the Mask: Spoofing Call Stacks Dynamically with Timers

This blog introduces a PoC technique for spoofing call stacks using timers. Prior to our implant sleeping, we can queue up timers to overwrite its

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