TrojanDownloader:Win32/Chekafe.A is a trojan that downloads and executes arbitrary files from a remote host. It also checks if the affected system is in an Internet Café; if so, it sends this information and the system's MAC address, to a remote host.
Upon execution, TrojanDownloader:Win32/Chekafe.A modifies the system registry as a mark of its successful installation:
Adds value: "ListVer"
With data: "1.0"
To subkey: HKLM\Software\CPACO
Downloads and executes arbitrary files
TrojanDownloader:Win32/Chekafe.A connects to remote hosts to download and execute arbitrary files in the affected system. In the wild, TrojanDownloader:Win32/Chekafe.A has been observed to contact the following host for this purpose:
At the time of writing, the downloaded files are online game password stealer trojans, including the following:
Sends information to a remote server
TrojanDownloader:Win32/Chekafe.A checks whether the following processes are running on the affected system:
These processes are related to software used in Internet Café administration. By searching these processes, Win32/Chekafe attempts to determinate whether the affected system is in an Internet Cafe or not. If so, it then posts this information, as well as the MAC address of the system, to a remote host.
Stop system service
TrojanDownloader:Win32/Chekafe.A attempts to stop the "sharedaccess" service to disable Windows Firewall/Internet Connection Sharing.
Analysis by Chun Feng