This sure looks like a nasty piece of work.
A new and improved botnet that has infected more than four million PCs is “practically indestructible,” security researchers say.
“TDL-4,” the name for both the bot Trojan that infects machines and the ensuing collection of compromised computers, is “the most sophisticated threat today,” said Kaspersky Labs researcher Sergey Golovanov in a detailed analysis Monday.
“[TDL-4] is practically indestructible,” Golovanov said.
. . .
TDL-4 infects the MBR, or master boot record, of the PC with a rootkit — malware that hides by subverting the operating system. The master boot record is the first sector — sector 0 — of the hard drive, where code is stored to bootstrap the operating system after the computer’s BIOS does its start-up checks.
Because TDL-4 installs its rootkit on the MBR, it is invisible to both the operating system and more, importantly, security software designed to sniff out malicious code.
But that’s not TDL-4′s secret weapon.
What makes the botnet indestructible is the combination of its advanced encryption and the use of a public peer-to-peer (P2P) network for the instructions issued to the malware by command-and-control (C&C) servers.
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Have cybercriminals created the perfect botnet — undetectable and indestructible?
If you ever needed a reason and reminder to keep your operating system, anti-virus, and anti-spywware software patched and up to date, this would be a good one.
/remember, if you’re not part of the solution, you’re potentially part of the problem
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