We may be seeing the stirrings of yet another Waledac distribution. Servers at 220.127.116.11 and 18.104.22.168 have been serving up a number of unusually named files since the 20th that appear to maintain not only the common Waledac unpacking stub, but some of the classic characteristics of the Waledac trojan/worm — the email/spam engine, AES encrypted/bzip2 compressed P2P peering listing, DDoS capabilities, http C&C contact, email harvester, and credential stealing functionality. Along with the FakeAv downloads coming from these servers, these executables may be a variant on the spambot. We’ll update this post with more information as we more accurately identify the malware.
Update: Some of the files definitely are Waledac spam/dos bots, with encoded command and control communications retrieved from http://cismosis. com/up21.php (there are others), as evidenced here:
AV detection is surprisingly low for these executables, be sure to add a layer of behavioral protection to your system with ThreatFire.