If you downloaded Transmission v2.92 between August 28th and August 29th, 2016. The chances are your system might be infected. You can identify the infection by verifying if any of the following exists:
/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 Support/com.apple.iCloud.sync.daemon/process.id
$HOME/Library/LaunchAgents/com.apple.iCloud.sync.daemon.plist
/Library/Application Support/com.apple.iCloud.sync.daemon/
$HOME/Library/LaunchAgents/com.geticloud.icloud.photo.plist
Also note that the malicious disk image was named Transmission2.92.dmg while the legitimate one […]