User Defined Reflective Loader (UDRL) Update in Cobalt Strike 4.5

The User Defined Reflective Loader was first introduced in Cobalt Strike 4.4. to allow the creation and use of a custom reflective loader. This quickly took off by the community and its limits were pushed. Updates were made in 4.5 to help address some of these limits. Updates Increase size A new hook BEACON_DLL_SIZE was […]

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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 quickly took off by the community and its limits were pushed.  Updates were made in 4.5 to help address some of these limits. Licensed users can download the updated kit from […]

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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 beacon listeners. A max retry strategy allows a beacon to exit after a specified failure count. As the failure count increases, sleep is adjusted to a specified value. By default, […]

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Process Injection Update in Cobalt Strike 4.5

Process injection is a core component to Cobalt Strike post exploitation. Until now, the option was to use a built-in injection technique using fork&run. This has been great for stability, but does come at the cost of OPSEC. Cobalt Strike 4.5 now supports two new Aggressor Script hooks: PROCESS_INJECT_SPAWN and PROCESS_INJECT_EXPLICIT.  These hooks allow a user to define how the fork&run and explicit injection techniques are implemented when executing post […]

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