Analysis Summary

Tinba (Tiny Banker Trojan) is a lightweight yet highly effective banking trojan that first emerged in 2012. Believed to have originated from Eastern European cybercriminal networks, Tinba is designed to steal banking credentials and financial data through form grabbing and web injection techniques. The malware gets its name from its extremely small size — just around 20KB — making it hard to detect.

Tinba has gone by several aliases, including Tinybanker, Zusy, and Banking Trojan.Zusy. While not officially linked to a specific Advanced Persistent Threat (APT) group, Tinba has been distributed via multiple cybercriminal forums and used by various threat actors over time, including those with ties to Eastern European fraud rings.

From 2012 to 2016, Tinba was involved in widespread campaigns targeting banks in Europe, the U.S., and parts of Asia. Its source code was leaked in 2014, which allowed various actors to customize and reuse the malware, leading to several modified variants.

In 2025, Tinba has resurfaced in more targeted phishing campaigns aimed at small and mid-sized financial institutions in North America and Southeast Asia. These campaigns involve weaponized Excel macros and fake login pages designed to trick users into revealing credentials. Analysts note that recent variants have incorporated anti-analysis features, basic encryption, and command-and-control (C2) server rotation to evade detection.

Despite its age, Tinba remains relevant due to its adaptability and effectiveness in credential theft. Security experts warn organizations to remain vigilant and enforce strict endpoint and email security controls.

Impact

• Credential Theft
• Data Leakage
• Financial Loss
• Unauthorized Access

Indicators of Compromise

SHA1

• 8d8d0f8d101e3bd5cca8b94191f148a931bb7be4
• 9677e9eb3e86310c966a2829c638751778372549
• 028ca5e21241f87c1b05e645154815163c589026
• 1e75a0923d35084edfda74e25b53517eb737bb69

Remediation

• Block all threat indicators at your respective controls.
• Search for indicators of compromise (IOCs) in your environment utilizing your respective security controls.
• Emails from unknown senders should always be treated with caution. 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.
• Patch and upgrade any platforms and software on time 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.