Key Mystic Stealer functions include its ability to extract data from web browsers and cryptocurrency wallets. It also identifies a likely system user geolocation using the locale and keyboard layout.
For starters, it is designed to collect computer information such as the system hostname, user name, and GUID. Mystic Stealer focuses on data theft, exhibiting capabilities that allow it to pilfer a wide array of information. Note: the content of this blog is also hosted by InQuest here. We also share indicators from an in-depth analysis of the infrastructure footprint of deployed Mystic Stealer controllers and countermeasures for detecting the client in your environment.
Together with our colleagues at InQuest, we present a deep dive technical analysis of the malware. Enter Mystic Stealer, a fresh stealer lurking in the cyber sphere, noted for its data theft capabilities, obfuscation, and an encrypted binary protocol to enable it to stay under the radar and evade defenses. With the amount of visibility we have at Zscaler, we are accustomed to encountering new threats on a daily basis. Demand for compromised credentials to fuel criminal access to user accounts and target networks has resulted in a steady stream of newly developed information-stealing malware, keeping account markets stocked. Credential information can further increase access or penetration into an environment. Many espionage-focused threat groups operate stealer families for pilfering information from target networks. Stealers also bridge the realms of criminal and nation-state focus. Oftentimes this is credential data, but it can be any data that may have financial value to an adversary this includes paid online service accounts, cryptocurrency wallets, instant messenger, or email contacts lists, etc. "Stealers" are a kind of malware designed to run on an endpoint post-compromise, while their primary features center on the theft of user data. This is the story of information stealers today. How do you know when something is in hot demand in the underground economy? The same way you do in the real world – the market becomes flooded. Mystic implements a custom binary protocol that is encrypted with RC4.
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The code is heavily obfuscated making use of polymorphic string obfuscation, hash-based import resolution, and runtime calculation of constants.The malware also targets cryptocurrency wallets, Steam, and Telegram.Mystic steals credentials from nearly 40 web browsers and more than 70 browser extensions.Mystic Stealer is a new information stealer that was first advertised in April 2023.
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