Transmission


'Transmission' Articles

BitTorrent Client Transmission Again Victimized by OS X Malware

Just five months after Transmission was infected with the first "ransomware" ever found on the Mac, the popular BitTorrent client is again at the center of newly uncovered OS X malware. Researchers at security website We Live Security have discovered the malware, called OSX/Keydnap, was spread through a recompiled version of Transmission temporarily distributed through the client's official website. OSX/Keydnap executes itself in a similar manner as the previous Transmission ransomware KeRanger, by adding a malicious block of code to the main function of the app, according to the researchers. Likewise, they said a legitimate code signing key was used to sign the malicious Transmission app, different from the legitimate Transmission certificate, but still signed by Apple and thereby able to bypass Gatekeeper on OS X. The researchers said they notified the Transmission team about the malware, and within minutes they removed the malicious file from their web server and launched an investigation. The researchers believe the infected Transmission app was signed on August 28 and distributed only on August 29, and thus recommend anyone who downloaded version 2.92 of the app between those dates to verify if their system is compromised by checking for the presence of any of the following files or directories: /Applications/Transmission.app/Contents/Resources/License.rtf /Volumes/Transmission/Transmission.app/Contents/Resources/License.rtf $HOME/Library/Application Support/com.apple.iCloud.sync.daemon/icloudsyncd $HOME/Library/Application

Transmission Malware Transmitted Through Server Hack, Downloaded 6,500 Times

Over the weekend, the first instance of Mac ransomware was found in a malicious update to the Transmission BitTorrent client. Version 2.90 of Transmission downloaded from the Transmission website was infected with "KeRanger" ransomware. "Ransomware" is a class of malware that encrypts a user's hard drive and files, demanding money to decrypt it. In this case, KeRanger would have required Mac users to shell out a bitcoin for decryption, equivalent to approximately $400. The developers behind Transmission have shared some additional details on the attack with Reuters, giving us some insight into how it occurred. The server that delivers the Transmission software to customers was breached in a cyber attack, allowing the KeRanger malware to be added to the disk-image of its software.Transmission representative John Clay told Reuters via email that the ransomware was added to disk-image of its software after the project's server was compromised in a cyber attack. "We're not commenting on the avenue of attack, other than to say that it was our main server that was compromised," he said. "The normal disk image (was) replaced by the compromised one."During the time that the malware-infected version of Transmission was available, it was downloaded approximately 6,500 times before the vulnerability was discovered. Security on the server has since been increased, ensuring a similar attack can't occur a second time. On Sunday, Transmission's developers released software updates to block the malicious software and to remove it from the Macs of users who had unwittingly