SapphireStealer: A .NET Malware Capable of Stealing Sensitive Data from Computers

SapphireStealer is an birth-source information stealer that will likely be utilized for obtaining pretty information, equivalent to corporate credentials, which are veritably sold to other threat actors who express the fetch entry to for added attacks, equivalent to espionage or ransomware/extortion schemes.

On December 25, 2022, the codebase for SapphireStealer used to be made available on GitHub. Essentially essentially essentially based on Cisco Talos researchers, starting in mid-January 2023, newly created SapphireStealer versions started showing in public malware repositories.

At this time, many threat actors are the express of this malware codebase. This probability already exists in a entire lot of forms, and threat actors continuously beef up its efficiency and efficacy.

The Working of SapphireStealer

Recordsdata-stealing malware dubbed SapphireStealer used to be created in .NET. It affords straightforward yet efficient functionality able to stealing inner most information from compromised programs, equivalent to:

• Host information.
• Screenshots.
• Cached browser credentials.
• Files kept on the machine that match a predefined list of file extensions.

It before all the pieces checks to see whether any browser processes are at the second active on the machine. It searches the list of active processes for any processes with names that correspond to the list, equivalent to Chrome, Yandex, msedge, and Opera.

The malware employs Job.Waste() to entire any matching processes if it finds them. The malware checks for the existence of credential databases for the browser apps the express of a aggravating-coded list of paths.

“The contents of any credential databases which are discovered are dumped. This information is then kept in a textual train file within the malware’s working listing known as Passwords.txt”, researchers acknowledged.

The malware then takes a snapshot of the machine and saves it in a file within the similar working listing.

The attacker compromises the machine by sending the guidelines thru a Easy Mail Transfer Protocol (SMTP).

“As this malware is birth-source and being dilapidated by more than one determined threat actors, important of this model job has took place independently and new functionality is now not present in sample clusters connected to other threat actors”, in keeping with the guidelines shared with Cyber Security News.

The malware creator has also made available a.NET malware downloader with the codename FUD-Loader, which enables the retrieval of further binary payloads from distribution servers below the attacker’s administration.

Researchers seen that this downloader used to be dilapidated to spread moderately a entire lot of alternative malware throughout 2023, in conjunction with DcRat, njRAT, DarkComet, AgentTesla, and more.

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