Rewterz Threat Advisory – Ursnif Banking Trojan aka Gozi – Active IOCs

Severity

Medium

Analysis Summary

Ursnif banking trojan also known as Gozi and Dreambot has been around for more than 10 years. It gained popularity in 2015 when its source code was published on Github and since then the moderators have always tweaked some changes to make use of their arsenal according to their gains. Mainly attacking banks and other financial institutions. As banking security has hardened and more customers have used mobile banking apps, attackers have switched to using Trojans such as Ursnif to steal other types of data, including email configurations, as well as credentials and passwords stored in the web browsers and even digital wallets. Threat actors use different techniques to make a victim fall into their trap. In many cases, a phishing email is sent to a victim that contains a malicious attachment – typically an Excel spreadsheet. If the victim clicks on an “Enable Content” button, they will not see the spreadsheet; rather an embedded macro code, which contains PowerShell commands and that’s how the infection begins to unfold.

Ursnif establishes communication with its command and control servers to receive instructions, download additional components or updates, and exfiltrate stolen data. It typically uses encrypted communication channels and employs advanced techniques to evade detection. This malware has undergone significant evolution over the years, with new variants and techniques emerging to bypass security measures and improve its effectiveness. It is often distributed as a polymorphic malware, making it difficult to detect using traditional signature-based antivirus solutions.

Impact

• Information Theft 
• Financial Loss 
• Exposure to Sensitive Information

Indicators of Compromise

IP

5.42.199.52

MD5

• 0628ccf661fc64319d1aeb0609a9dfb6
• 547dcb2e392adc56d9d7ed1748ba99c4
• 1fb9fcc2d60c27951387ec6cf8740583
• 9231b7e8023cd8f364f340c38ccb6eaf

SHA-256

• 7c79181a7a89bfe44fb8103eb253eaca4e82e768ba0882a7c4de274b5192dab2
• c92faf82686dcadc018709ce4180f6e1eeddfa8fa40a190656c187589ca44e24
• 774877b94f97052a0c875895d104c21370e2db25cd72cb870a00285e756ca56c
• 7641f95d9ec8a30f937972f4817ad5dda1fba65ab2683bdadfa74c872f3c967c

SHA-1

• 85c2069fdae08f3bd095a9a9343201c600673311
• df15a567b3661ab3a5e4a0422a0ac30a2403700e
• 645201da94587850f68566f43db4d919f215bdb8
• 3f9f354a16b7e9135c29fd88259cf13130b8c1b3

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Never trust or open links and attachments received from unknown sources/senders.
• Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.
• Keep operating systems and software up to date: Ursnif malware often exploits vulnerabilities in software and operating systems. Keeping these up to date can help prevent vulnerabilities from being exploited.
• Implement strong password policies: Ursnif malware often relies on stolen login credentials to access sensitive information. Implementing strong password policies and multifactor authentication can make it more difficult for attackers to gain access.
• Provide regular security awareness training for employees that can help them recognize phishing emails and other types of social engineering attacks that are commonly used to spread Ursnif malware.