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Strela Stealer Technical Analysis.

ReportMalware Analysis ReportsThreat Intelligence Researches

Published 11 Feb 2026Updated 17 Oct 2026

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Strela stealer is information-stealing malware for Windows that steals email login details from Microsoft Outlook and Mozilla Thunderbird. The post says it targets only Germany, Spain, Basque Country, Saudi Arabia and Poland. MITRE ATT&CK lists it as first seen in November 2022 and says it collects and sends out email credentials automatically.

Only Germany, Spain, Basque Country, Saudi Arabia, and Poland are targeted, and the information it attempts to capture comprises data stored in Thunderbird and Outlook email applications.

Strela Stealer represents a significant threat to email account security by targeting credentials from widely used clients such as Microsoft Outlook and Mozilla Thunderbird. Its sophisticated techniques, including searching specific directories and decrypting data using Windows CryptUnprotectData, highlight the evolving complexity of malware.

What Does the Strela Stealer Report Cover?

Learn Technical Method of Operation Details
You will find the technical details of the Strela Stealer its functions, and details about cyber attack tactics. The report will show many points about its technical details, detections, and IoCs.

Gain Knowledge About Future Attacks
By understanding its attack model, you can make more informed predictions about the future of cybersecurity. Stay up-to-date with the latest trends and keep your business from potential threats.

Response & Mitigation Tactics From Experts
Brandefense analysts share practical response and mitigation advice on this topic. The Strela Stealer employs sophisticated techniques to avoid analysis by security researchers. You need experts’ perspective.

Questions

Frequently Asked Questions.

  • It is information-stealing malware that focuses on finding, collecting and sending out email credentials from clients such as Outlook and Thunderbird, according to MITRE ATT&CK.

  • It takes email account data. For Outlook it reads IMAP credentials from registry keys, and for Thunderbird it collects login files and encryption keys from profile directories (MITRE ATT&CK).

  • The post says only Germany, Spain, Basque Country, Saudi Arabia and Poland are targeted. MITRE ATT&CK does not name target countries.

  • CISA says an unsolicited email asking you to open an attachment is a common way to deliver malware. Check requests with the organization directly and enforce multifactor authentication.

Where To Next.

Use Case Threat Actor Landscape See which groups matter for your sector. Open → Library Threat Library Groups, malware, techniques and incidents. Open → Module Dark Web Monitoring Watch the places where stolen data is traded. Open →

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