CobaltBus is a Cobalt Strike External C2 Integration With Azure Servicebus, C2 traffic via Azure Servicebus
Then CobaltBus DotNetCore binary that integrates with CobaltStrikes ExternalC2, will create a local SqliteDB in order to keep track of multiple beacons. The messages inbound to CobaltBus will be captured and written to the database. The database names “CobaltBus.db” and “CobaltBus-log.db” will be created in the directory CobaltBus.dll is running from. Once a Beacon binary runs, it will push an “INITIALIZE” message to the baseQueueName queue, with a randomly generated BeaconId and Pipename. The CobaltBus handler will then capture this, create and move into the two new queues based on the BeaconId sent, request stager shellcode from the CobaltStrike, and push it back down the new queue as an “INJECT” message. From here, the Beacon project injects the captured shellcode into memory and establishes a connection with the CobaltStrike beacon over the generated pipe name. When a command is issued from CobaltBus, it is pushed down the beacon respective queue and into the beacon pipe name.
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