Sign up for our Technology Newsletter 
Malware Turns Computers Into Cellular Antenna
Comments Off on Malware Turns Computers Into Cellular Antenna
A team of Israeli researchers have improved on a way to steal data from air-gapped computers, thought to be safer from attack due to their isolation from the Internet.
They’ve figured out how to turn the computer into a cellular transmitter, leaking bits of data that can be picked up by a nearby low-end mobile phone.
While other research has shown it possible to steal data this way, some of those methods required some hardware modifications to the computer. This attack uses ordinary computer hardware to send out the cellular signals.
Their research, which will be featured next week at the 24th USENIX Security Symposium in Washington, D.C., is the first to show it’s possible to steal data using just specialized malware on the computer and the mobile phone.
“If somebody wanted to get access to somebody’s computer at home — let’s say the computer at home wasn’t per se connected to the Internet — you could possibly receive the signal from outside the person’s house,” said Yisroel Mirsky, a doctoral student at Ben-Gurion University and study co-author.
The air-gapped computer that is targeted does need to have a malware program developed by the researchers installed. That could be accomplished by creating a type of worm that infects a machine when a removable drive is connected. It’s believed this method was used to deliver Stuxnet, the malware that sabotaged Iran’s uranium centrifuges.
The malware, called GSMem, acts as a transmitter on an infected computer. It creates specific, memory-related instructions that are transmitted between a computer’s CPU and memory, generating radio waves at GSM, UMTS and LTE frequencies that can be picked up by a nearby mobile device.
The GSMem component that runs on a computer is tiny. “Because our malware has such a small footprint in the memory, it would be very difficult and can easily evade detection,” said Mordechai Guri, also a doctoral student at Ben-Gurion.
McAffee See Sure In Spam
The first three months of 2013 have seen a surge in spam volume, as well as a growing number of samples of the Koobface social networking worm and master boot record (MBR) infecting malware, according to antivirus vendor McAfee.
After remaining relatively stable throughout 2012, spam levels rose during the first quarter of 2013, reaching the highest volume seen in the past two years, McAfee said in a report released Monday.
The amount of spam originating from some countries rose dramatically, McAfee said. Spam from Belarus increased by 540% while spam originating in Kazakhstan grew 150%.
Cutwail, also known as Pushdo, was the most prevalent spam-sending botnet during the first quarter, McAfee said.
The increased Pushdo activity has recently been observed by other security companies as well. Last month, researchers from security firm Damballa found a new variant of the Pushdo malware that’s more resilient to coordinated takedown efforts.
On the malware front, McAfee has also seen a surge in the number of Koobface samples, which reached previously unseen levels during the first quarter of 2013. First discovered in 2008, Koobface is a worm that spreads via social networking sites, especially through Facebook, by hijacking user accounts.
The number of malware samples designed to infect a computer’s master boot record (MBR) also reached a record high during the first three months of 2013, after increasing during the last quarter of 2012 as well, McAfee said.
The MBR is a special section on a hard disk drive that contains information about its partitions and is used during the system startup operation. “Compromising the MBR offers an attacker a wide variety of control, persistence, and deep penetration,” the McAfee researchers said in the report.
The MBR attacks seen during the first quarter involved malware like StealthMBR, also known as Mebroot; Tidserv, also known as Alureon, TDSS and TDL; Cidox and Shamoon, they said.
Windows Malware Hides In iOS App
Windows malware slipped past Apple’s eye and has been found tucked into software available on the company’s iOS App Store.
Although the malware, labeled a worm by Microsoft and tagged as “Win32/VB.CB” by the company, is harmless against Apple’s iOS and OS X operating systems, it may pose a threat to iTunes customers who download iPhone and iPad apps to their Windows PCs before syncing to their mobile devices.
A user reported Win32/VB.CB to Apple’s support forum around 10:30 a.m. ET Tuesday. The user, identified only as ”deesto,” said that his or her OS X antivirus warned that “Instaquotes-Quotes Cards for Instagram” was infected.