Rewterz Threat Alert – 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.

Impact

• Information Theft 
• Financial Loss 
• Exposure to Sensitive Information

Indicators of Compromise

MD5

• 4ea4f4bde9f76d9ba624d958d4ca5b50
• fe5e9708758a5a302e1df62fc879a69a
• 4855b39d23d9476f6302dd0160665534
• 574506df22c505dad83bb1611ae83386
• 182189621b5f02f37e4fac455aab5a39

SHA-256

• 37bae5e29633f171616988fd64cfae9038cf8167677879a0c4cb4ed4761b9ebf
• 7d2f338e631518226af04bd9608e452202634cd565d48c506ef6e23bfedccb6d
• 4b8dbe4d5a5547c30971cda34392a943c11964e43f62325dd753620744063b8d
• 5699d20b8f7f27f82707b8f745c713437357cfe409432b8dc966fa223be8f7b4
• c95c8b01e7a58afbae1b0c3a795108ae46b22c3867680dcdb883ca97e6f092a0

SHA-1

• 81009ab0612ef7e4ee437a136c0e5cb22bab4ec0
• 66e1de8954e7f43f97fe7c98d2a84aebb33523af
• 7ee55c731527a466cbf2430265353d8832cfcbba
• d9207f15c021042fc11e1b17e49eb675e546acf9
• f55d8daca9c22de495070f9ca9631681775eb487

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.
• 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 in a timely manner. Using multi-layered protection is necessary to secure vulnerable assets