Strela Stealer

Strela Stealer

Product Serial: B-2022-11-29a

TLP: CLEAR

In November 2022, ZeroFox Intelligence analyzed a new information stealer known as Strela Stealer. While most current information stealers target a wide variety of applications and cryptocurrencies, Strela Stealer instead focuses on credentials obtained from Microsoft Outlook and Mozilla Thunderbird.

Standing Intelligence Requirements

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Scope Note

ZeroFox Intelligence is derived from a variety of sources, including—but not limited to—curated open-source accesses, vetted social media, proprietary data sources, and direct access to threat actors and groups through covert communication channels. Information relied upon to complete any report cannot always be independently verified. As such, ZeroFox applies rigorous analytic standards and tradecraft in accordance with best practices and includes caveat language and source citations to clearly identify the veracity of our Intelligence reporting and substantiate our assessments and recommendations. All sources used in this particular Intelligence product were identified prior to 5:00 PM (EST) on November 25, 2022; per cyber hygiene best practices, caution is advised when clicking on any third-party links.

Executive Summary

In November 2022, ZeroFox Intelligence analyzed a new information stealer known as Strela Stealer. While most current information stealers target a wide variety of applications and cryptocurrencies, Strela Stealer instead focuses on credentials obtained from Microsoft Outlook and Mozilla Thunderbird. Publicly available samples are known to spread via ISO files containing Windows Shortcut (.lnk) files. An ISO file is a type of container file—similar to ZIP files without compression—that is most commonly used in connection with optical media such as a CD-ROM or DVD. Clicking on the included shortcut file in this instance uses Windows’ built-in rundll32.exe to open x.html, a polyglot file that is a valid HTML file and Windows dynamic link library (DLL).