Daserf — This backdoor has the functionality of a remote shell and can be used to execute commands, upload and download data, capture screenshots, and log keystrokes. As of this publication, BRONZE BUTLER demonstrates a preference for concurrently using Datper and xxmm in its operations. Source: Secureworks) - xxmm downloader (also known as KVNDM) — This simple downloader's code is similar to the main xxmm payload. MSGet — This persistent downloader uses a dead-drop resolver (DDR) to download and execute another malicious payload. MSGet typically downloads encoded binaries from hard-coded URLs. Use the ‘at' or ‘schtask' commands to register a scheduled task to be executed in a few minutes. Use downloaders or other malware to send the new list to a compromised host. Use an uploader or other malware to send the archived files to an attacker-controlled server. Search proxy log files for evidence of web server scanning using the URL patterns associated with BRONZE BUTLER activity. In particular, review network access for use of mobile USB modems on corporate systems