Hi Gegun,
I can confirm we’re seeing exactly the same alert from our SonicWalls now…
I’ve already submitted this as a False Positive to Dell SonicWall and we’ve temporarily unselected the option in our devices to filter content for this particular signature.
I’d recommend that you still get in touch with SonicWall to discuss your particular occurrence of this problem, just in case yours isn’t a False Positive.
Hope this helps.
Warmly,
Trojan-Webmaster