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The trojan was dropped into a third-party Win32 driver that was available from a third-party vendor. This third-party vendor was quickly identified as Ziff Davis, the game publisher that created the Flash-based game Counter-Strike: Source. Since the driver was unsigned, the first thing that concerned us was that this would be a major security risk for anyone that was using it. However, we did not believe it was part of the actual Windows operating system, and therefore was not part of the “critical” and “important” sections of the Windows ecosystem.
Ziff Davis appeared to be concerned with this leak, and immediately began an investigation to identify the source of the leak. Despite this investigation, the trojan became widely available, and is still present in some botnets today.
We took a look at this trojan, and its behaviour, as it was widely distributed to antivirus software. It was a small number of AV vendors who had no protection against it. We worked with our AV vendor partners, and by the time we saw this trojan, the signatures for it were in our software. This could have been a classic case of the “Anti-Virus Failure” and this would have been a “zero day”. However, this trojan was more interesting than just being a zero-day; as we found, it was not just a null-day, or a blind-day, but rather a “Wormday”.
The data collection process began with creating a “zero day” exploit for this trojan. However, the trojan was known to run a number of auto-start services, and we could not use this approach because of potential conflict with legal authorities. Instead, we crafted a Java program that checked if the AV products that were being run had a protection for the trojan. If this was the case, the program started the malicious processes to inject the trojan. We then tested this exploit against different AV vendors, and it was immediately rejected by a number of vendors as a threat, and as a false positive. This was because the trojan was not a high-profile threat, but rather a low-profile threat.
An AV vendor that decided to deploy the Java program we developed, and before we had identified the “zero day”, was a French AV vendor called SysProtect. We thought that this was a company that had good knowledge of threats, and based on the SysProtect results, we didn’t feel that this was a threat. The SysProtect results showed that this was a low-profile threat.
We then gave the Java program to another AV vendor, a Russian AV vendor called Kaspersky, who performed an automated check of the Java program and said that it was a legitimate, clean program that they were happy to deploy. We then checked the 0b46394aab