Grum botnet loses Dutch servers
Still alive and spamming in Russia, Panama
ISPs in Russia and Panama are continuing to host Grum botnet command-and-control servers, after Dutch authorities silenced C&Cs in their country.
According to FireEye Research, two Netherlands-based servers were taken offline on July 17.
“With these two servers offline, the spam template inside Grum's memory will soon time out and the zombies will try to fetch new instructions but will not able to find them. Ideally this should stop these bots from sending more spam”, writes FireEye’s Atif Mushtaq.
Mushtaq adds that the company believes Grum to be the world’s third-largest Spam botnet.
However, he says, FireEye’s attempts to contact the Russian host, Gazinvestproekt, and the Panamanian Panamaserver.com, have been unsuccessful, so servers in these countries are still operational.
“Using these two live servers, the bot herders might try to recover their botnets by executing a worldwide update. No action has been taken by the bot herders so far. There is complete silence from their side,” the FireEye blog post continues.
Botnets are the target of a growing international effort targeting their C&C servers. Earlier this year, Microsoft claimed credit for taking down the extensive Zues and SpyEye botnets, and earlier this month the DNS servers associated with DNSChanger were finally shut down. ®