The Cobalt Gang cybercrime group has launched a new round of phishing campaigns targeting primarily Russian and Romanian banking customers with CobInt, a recently discovered malicious backdoor and downloader.
Written in C, CobInt is comprised of three stages: a first-stage downloader, the primary payload, and a series of modules capable of reconnaissance activities such as capturing screenshots and compiling a list of running process names.
The main payload is what actually communicates with the attackers' command-and-control server and downloads the additional modules via HTTPS, Proofpoint reported in a Sept. 11 blog post. The C&C server response is intentionally designed to look like an HTML file as a technique for avoiding analysis tools.
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