Trojan-Banker.Win32.Chthonic

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan-Banker

Trojan-Banker programs are designed to steal user account data relating to online banking systems, e-payment systems and plastic card systems. The data is then transmitted to the malicious user controlling the Trojan. Email, FTP, the web (including data in a request), or other methods may be used to transit the stolen data.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Research shows that this malware family is an offshoot of ZeusVM malware. However, the Trojan-Banker.Win32.Chthonic family is significantly different from its predecessors. In this newer malware, the cybercriminals use code obfuscation techniques observed previously in the Andromeda bot family. To complicate attempts to analyze the malware and its network traffic, cybercriminals encrypt malware components (such as configuration files) using the same algorithms and methods seen with the Zeus AES and Zeus V2 Trojans. As with the ZeusVM malware family (also known as KINS), Trojan-Banker.Win32.Chthonic encrypts its files with the help of a virtual machine. Trojans of this family are distributed by cybercriminals in spam messages designed to exploit vulnerabilities, or by the Andromeda bot, which downloads the malware to an infected computer. The initial Trojan-Banker.Win32.Chthonic loader downloads a more advanced loader, which then downloads the main module of the Trojan. Trojans in this family have a modular architecture, with a main component that supports the following downloadable modules: • info, collects information about the infected computer. • pony, steals saved passwords. • klog, intercepts keystrokes. • http, inserts a malicious script into web pages and intercepts data entered in online forms in web browsers. • vnc, enables cybercriminals to remotely connect to the infected computer and perform banking transactions. • socks, a separate SOCKS proxy server. • cam_recorder, enables cybercriminals to record video and audio from a computer's webcam and microphone.

Top 10 countries with most attacked users (% of total attacks)

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