TrojanSpy:Win32/Bancos.ACJ

TrojanSpy:Win32/Bancos.ACJ is a member of Win32/Bancos - a family of data-stealing trojans that captures online banking credentials, such as account login names and passwords, and relays the captured information to a remote attacker. Most Win32/Bancos variants target customers of Brazilian banks, though some variants target customers of banks in other locations.

When executed, TrojanSpy:Win32/Bancos.ACJ copies itself to <system folder>\seriusdat.exe.

Note: <system folder> refers to a variable location that is determined by the malware by querying the Operating System. The default installation location for the System folder for Windows 2000 and NT is C:\Winnt\System32; and for XP, Vista, and 7 is C:\Windows\System32.

The malware modifies the following registry entries to ensure that its copy executes at each Windows start:

Adds value: "ToolBar"
With data: "c:\windows\system32\seriusdat.exe"
To subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

The malware creates the following files on an affected computer:

TrojanSpy:Win32/Bancos.ACJ modifies the Windows Hosts file. The local Hosts file overrides the DNS resolution of a website URL to a particular IP address. Malicious software may make modifications to the Hosts file in order to redirect specified URLs to different IP addresses. Malware often modifies an affected computer's Hosts file in order to stop users from accessing websites associated with particular security-related applications (such as antivirus for example).

The malware may contact the following remote hosts using port 80:

• envc.machcar.kr
• vhosts.packmanbd.com

Commonly, malware may contact a remote host for the following purposes:

• To confirm Internet connectivity
• To report a new infection to its author
• To receive configuration or other data
• To download and execute arbitrary files (including updates or additional malware)
• To receive instruction from a remote attacker
• To upload data taken from the affected computer

This malware description was produced and published using our automated analysis system's examination of file SHA1 c58d8466deb08c62d7719838587adffc5255e5d7.