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. It uses RC4 encryption and custom Base64 encoding to obfuscate HTTP traffic. CTU researchers identified two versions of Daserf written in Visual C and Delphi. Datper uses an RC4-encrypted configuration to obfuscate HTTP traffic. xxmm (also known as Minzen) — This RAT and likely successor to Daserf AES-encrypts HTTP communications using a one-time encryption key. As of this publication, BRONZE BUTLER demonstrates a preference for concurrently using Datper and xxmm in its operations. MSGet — This persistent downloader uses a dead-drop resolver (DDR) to download and execute another malicious payload. Source: Secureworks) - RarStar — This custom tool uploads RAR archives to a specified URL as POST data (see Figure 6). RarStar encodes the POST data using Base64 and a custom XOR algorithm. Use the ‘at' or ‘schtask' commands to register a scheduled task to be executed in a few minutes. Use malware to upload the large list of enumerated files to the C2 server