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The Sleep Mask Kit was first introduced in Cobalt Strike 4.4 to allow users to modify how the sleep mask function looks in memory in order to defeat static signatures that identified Beacon. This

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A Deeper Look Into the Max Retry Strategy Option

A complementary strategy to the Host Rotation Strategy was introduced to Cobalt Strike 4.5. The max retry strategy was added to HTTP, HTTPS, and DNS

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Cobalt Strike 4.5: Fork&Run – you’re “history”

Cobalt Strike 4.5 is now available. This release sees new options for process injection, updates to the sleep mask and UDRL kits, evasion improvements and

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TeamServer.prop

Following the 4.4 release, you may have noticed a warning message when starting your teamserver: The missing file is optional and its absence does not

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Cobalt Strike 4.4: The One with the Reconnect Button

Cobalt Strike 4.4 is now available. This release puts more control into your hands, improves Cobalt Strike’s evasive qualities and addresses a number of smaller

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Cobalt Strike DoS Vulnerability (CVE-2021-36798)

SentinelOne discovered a denial of service (DoS) vulnerability in Cobalt Strike. The bug (aka Hotcobalt) can cause a denial of service on a teamserver by using

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SSL certificate verification failure

UPDATE: This has now been fixed. I’ve amended this post to reflect that. If you ran the Cobalt Strike update program today, you may have

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Cobalt Strike 4.3 – Command and CONTROL

Cobalt Strike 4.3 is now available. The bulk of the release involves updates to DNS processing but there are some other, smaller changes in there

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Cobalt Strike 4.2 – Everything but the kitchen sink

Cobalt Strike 4.2 is now available. This release overhauls our user exploitation features, adds more memory flexibility options to Beacon, adds more behavior flexibility to

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Cobalt Strike 4.1 – The Mark of Injection

Cobalt Strike 4.1 is now available. This release introduces a new way to build post-ex tools that work with Beacon, pushes back on a generic

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