User Defined Reflective Loader (UDRL) Update in Cobalt Strike 4.5
The User Defined Reflective Loader (UDRL) was first introduced in Cobalt Strike 4.4. to allow the creation and use of a custom reflective loader. This
Sleep Mask Update in Cobalt Strike 4.5
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
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
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
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
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
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
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
Simple DNS Redirectors for Cobalt Strike
This post, from Ernesto Alvarez Capandeguy of Core Security’s CoreLabs Research Team, describes techniques used for creating UDP redirectors for protecting Cobalt Strike team servers.
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