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Analysis of a modern malware distribution system
Pushdo is usually classified as a "downloader" trojan - meaning its true purpose is to download and install additional malicious software. There are dozens of downloader trojan families out there, but Pushdo is actually more sophisticated than most, but that sophistication lies in the Pushdo control server rather than the trojan.
When executed, Pushdo reports back to one of several control server IP addresses embedded in it code. The server listens on TCP port 80, and pretends to be an Apache webserver.
At SecureWorks.
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