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Severity
Medium
Analysis Summary
The Tetrade is coined for four large banking trojan families created, developed and spread by Brazilian threat actors on a global level. Brazilian banking trojans have evolved greatly, with hackers adopting techniques for bypassing detection, creating highly modular and obfuscated malware, and using a very complex execution flow, which makes analysis a painful, tricky process. These four banking trojan families: Guildma, Javali, Melcoz and Grandoreiro, are now fully developed and are expanding abroad. Guildma spreads rely heavily on malspam containing a malicious file in compressed format, attached to the email body. File types vary from Visual Basic Script to LNK. Most of the phishing messages emulate business requests, packages sent over courier services or any other regular corporate subjects, including the COVID-19 pandemic, but always with a corporate appearance.
Impact
- Information Theft
- Unauthorized Remote Access
- Detection Evasion
- Financial Theft
Indicators of Compromise
MD5
- 1b50b1e375244ce5d4e690cf0dbc96d8
- 071d3d6404826c24188dc37872224b3d
- c63b4eb3067d8cb5f2d576bc0777e87d
- aeaf7355604685d4d753d21902ff1c1c
- 4194162fe30a3dca6d8568e72c71ed2d
- 0931a26d44f0e7d70fda9ef86ee203f4
- 0219ef20ab2df29b9b29f8407cf74f1c
SHA-256
- 4457ba582eca79b16186855ff3dd53ae197c886167c7ffd370b9fe9daff656b3
- a739b03a7192828b0da31d077609981bf67912a74470bc19cd7e28c9b44761eb
- 4eb22da818d15108ceebe699116459a79046716ca695ebc81668c042b7557e2e
- 6d27525b615b4bfd10284fda160a454b131ed305d39da4fa640d297316a1225d
- ed9277870a1da0080b7b35f2d6a6b9da931161a9e0e362f2bdbf7456c2f23232
- 49190fbebc01eaab9551957ff90c5151fe9104e8fc31ac4cf6038dcdaad01f25
- 86cd8139c074964554c3f674b6f12ec2fe8d8c0765aa7d77117dc099ccf884d8
SHA1
- c24d8e6e8384f6623ebae9cf35bb6bfeee8cc900
- b35ee8162ca3666ae14d60634ac3f1a438d2d3b5
- 25038daa9f2bd4c0da85ca0a491a0e8ee33649f2
- 8db0f9e9258f7f00861b696c25fa7f7054192eb3
- 6ebc6d5f99aafd855ada683ff208eaaedffa1b93
- 6385cf85ba16376a6d22f019ae97194c5eca00a7
- 2b420bf1a31712098028dcd3651fbef2c66ce802
Remediation
- Block the threat indicators at respective controls.
- Avoid downloading attachments from untrusted emails.