A researcher discovered more than 300 unique samples which are used by 200 servers to compromise and steal money from victims bank account especially from Brazilian credit institutions clients.
This Malware’s unique capability and evasion technique trying to find out whether the injected system has run under a virtual environment, if yes then it automatically terminates itself.
Also, it keeps monitoring the victims Windows local language settings and finds out the Portuguese language in order to avoid infection.
Dr.Web researchers named this malware as Trojan.PWS.Banker1.28321 and it launch with the name of adobe reader.
Banking Malware Infection Process
The initial infection started by dropping malicious adobe reader applications into victims machine which later drops the VBscript scripts since the malware is written in .NET.
Once the infected users execute the malware then the load script is dropped by standard MSScriptControl.ScriptControl COM object.
Later it connects to attackers command & control server and downloads two ZIP-archives from it.
According to Dr. Web Research, One file contains the obfuscated dynamic library created using Delphi development environment. This library contains the malicious program’s main functions.
After the complete infection, Once the victims open the Internet banking sites of various Brazilian financial institutions such as Santander, Diagnostico BB, Sicredi, etc then it will replace the original web page with malicious fake authentication form.
Finally malware requests to enter an authorization verification code that received from banks then it will send to the attackers.
This scheme of replacing the content of original, user-viewed web pages with the “bank-client” systems is used by many banking Trojans. Often they threaten credit institutions’ clients not only in Brazil but around the world, Dr. Web Said.