Rewterz Threat Alert – STRRAT Malware – Active IOCs

Severity

High

Analysis Summary

STRRat is a Java-based Remote-Access Trojan (RAT) with a slew of malicious features, notably information theft and backdoor capabilities. This RAT was first identified at the German cybersecurity firm in June 2020. This malware uses plugins to grant the attacker remote access. One of the key focuses of STRRAT is to steal credentials from web browsers and email clients. It specifically targets popular browsers such as Firefox, Internet Explorer, and Chrome, as well as email clients like Foxmail, Outlook, and Thunderbird. By capturing credentials through keylogging techniques, the RAT enables attackers to gain unauthorized access to users’ sensitive information.

Notably, starting from Version 1.2, STRRAT gained notoriety for its behavior resembling that of ransomware. It appends the file name extension .crimson to encrypted files, creating a sense of urgency and intimidation for victims. With the release of Version 1.5, STRRAT introduced enhanced obfuscation techniques and modularity, while retaining its core backdoor functionalities. These functionalities include collecting browser passwords, executing remote commands and PowerShell scripts, logging keystrokes, and more.

Also, this RAT can be used to run commands that let users upload files, download files, delete files, open files, restart computers, and carry out a variety of other tasks. Furthermore, users who have the STRRAT installed on their computers run the risk of experiencing issues with online privacy, surfing security, financial loss, identity theft, account lockout, system infection with further infections, etc.

Given the capabilities and evolving nature of STRRAT, individuals and organizations need to implement robust security measures, including up-to-date antivirus software, regular system updates, and user awareness training. By staying vigilant and adopting proactive security practices, users can help protect themselves against the threats posed by STRRAT and similar malware strains.

Impact

• Unauthorized Access
• Information Theft
• Exposure of Sensitive Data

Indicators of Compromise

MD5

• 0c42b567e6e63f1205d35949347d6976
• da71d774568ec966d75dc0303c5c212a
• 9d4d7fe5b3307017f98dce21bb142547
• 5f73f282fd6efe7a9c426b3782a99483

SHA-256

• 5e5d5352d074c08a5e8aaf7b90bf308118cab00aa12f82e3ebb5697bcb6ee517
• 0972f05cc8250416b109aec8c65503ec2d25d69778dcf36b9764a2bd79648618
• 288ff2d664d112c5d94982aee0af7357df33c85649379f8a4c2ae08c13df9cc6
• b8d23d8f9495c315a1a7c8daf8284f8407f0987d1b4f1d2c2880fa1fc62572a2

SHA-1

• fcfa790eddde08aa4666c87ff56446589d322cb9
• bb27749d3a869043a86962729f533de481d620bb
• efe4c9165cc6a180714c3349914e2acc1bd02513
• d9d2945053aab6d20b4154c763780300f867ade9

Domain Name

• 50kteam.dynamic-dns.net
• lestencrypt.dnset.com

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Passwords – Ensure that general security policies are employed including implementing strong passwords, correct configurations, and proper administration security policies.
• Admin Access – limit access to administrative accounts and portals to only relevant personnel and make sure they are not publicly accessible.
• Patch and upgrade any platforms and software timely and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.
• Enable antivirus and anti-malware software and update signature definitions on time. Using multi-layered protection is necessary to secure vulnerable assets.