First Mac Ransomware Found in Transmission BitTorrent Client

transmission-29
This weekend, a notice appeared on Transmissionbt.com warning users that version 2.90 of the popular Mac BitTorrent client downloaded from their site may have been infected with malware. The warning reads:

Everyone running 2.90 on OS X should immediately upgrade to 2.91 or delete their copy of 2.90, as they may have downloaded a malware-infected file.

Using “Activity Monitor” preinstalled in OS X, check whether any process named “kernel_service” is running. If so, double check the process, choose the “Open Files and Ports” and check whether there is a file name like “/Users//Library/kernel_service”. If so, the process is KeRanger’s main process. We suggest terminating it with “Quit -> Force Quit”

Reuters reports that the infected download contained the first "Ransomware" found on the Mac platform. Ransomware is a type of malware that encrypts a user's hard drive and demands payment in order to unencrypt it. This type of attack has been increasingly popular on the PC, but this is the first time it has been seen on the Mac.

According to Reuters, Apple is aware of the issue and has already revoked "a digital certificate from a legitimate Apple developer that enabled the rogue software to install on Macs."

The malware in question is said to delay encrypting the user's hard drive for 3 days, so we may see the first reports of those affected as early as Monday. Transmissionbt.com offers instructions on how to see you are affected (above). If you don't use the Transmission software, there is nothing you need to do at this time.

Update: Technical details about the malware.

Update 2: Transmissionbt.com says version 2.92 of Transmission will actively remove the malware.

Popular Stories

iPhone 17 Pro in Hand Feature Lowgo

iPhone 17 Pro Coming Soon With These 14 New Features

Friday July 4, 2025 1:05 pm PDT by
Apple's next-generation iPhone 17 Pro and iPhone 17 Pro Max are just over two months away, and there are plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models. Latest Rumors These rumors surfaced in June and July:Apple logo repositioned: Apple's logo may have a lower position on the back of the iPhone 17 Pro models, compared to previous...
iphone 16 pro models 1

Here's How the iPhone 17 Pro Max Will Compare to the iPhone 17 Pro

Saturday July 5, 2025 1:00 pm PDT by
Apple should unveil the iPhone 17 series in September, and there might be one bigger difference between the Pro and Pro Max models this year. As always, the Pro Max model will be larger than the Pro model:iPhone 17 Pro: 6.3-inch display iPhone 17 Pro Max: 6.9-inch displayGiven the Pro Max is physically larger than the Pro, it has more internal space, allowing for a larger battery and...
iPhone Car Key Kia

Here's Which Vehicles Offer iPhone Car Keys

Sunday July 6, 2025 3:03 pm PDT by
In 2020, Apple added a digital car key feature to its Wallet app, allowing users to lock, unlock, and start a compatible vehicle with an iPhone or Apple Watch. The feature is currently offered by select automakers, including Audi, BMW, Hyundai, Kia, Genesis, Mercedes-Benz, Volvo, and a handful of others, and it is set to expand further. Apple has a web page with a list of vehicle models that ...
imac video apple feature

Apple Launching These 15+ Products Later This Year

Sunday July 6, 2025 8:05 am PDT by
The calendar has turned to July, meaning that 2025 is now more than half over. And while the summer months are often quiet for Apple, the company still has more than a dozen products coming later this year, according to rumors. Below, we have outlined at least 15 new Apple products that are expected to launch later this year, along with key rumored features for each. iPhone 17 Series iPho...
iOS 26 Feature

Everything New in iOS 26 Beta 3

Monday July 7, 2025 1:20 pm PDT by
Apple is continuing to refine and update iOS 26, and beta three features smaller changes than we saw in beta 2, plus further tweaks to the Liquid Glass design. Apple is gearing up for the next phase of beta testing, and the company has promised that a public beta is set to come out in July. Transparency In some apps like Apple Music, Podcasts, and the App Store, Apple has toned down the...
iphone 17 pro render majin bu

New iPhone 17 Pro Renders Highlight Apple Logo and MagSafe Design Changes

Sunday July 6, 2025 8:43 pm PDT by
New renders today provide the best look yet relocated Apple logo and redesigned MagSafe magnet array of the iPhone 17 Pro and iPhone 17 Pro Max. Image via Majin Bu. Several of the design changes coming to the iPhone 17 Pro model have been rumored for some time, such as the elongated camera bump that spans the full width of the device, with the LiDAR Scanner and flash moving to the right side. ...
iPhone 17 Pro in Hand Feature Lowgo

iPhone 17 Pro to Reverse iPhone X Design Decision

Monday July 7, 2025 9:46 am PDT by
Since the iPhone X in 2017, all of Apple's highest-end iPhone models have featured either stainless steel or titanium frames, but it has now been rumored that this design decision will be coming to an end with the iPhone 17 Pro models later this year. In a post on Chinese social media platform Weibo today, the account Instant Digital said that the iPhone 17 Pro models will have an aluminum...
Prime Day 25 Feature Warm Triad

The Best Early Prime Day Deals on Apple Products

Saturday July 5, 2025 7:22 am PDT by
Amazon is soon to be back with its annual summertime Prime Day event, lasting for four days from July 8-11, the longest Prime Day yet. As it does every year, Prime Day offers shoppers a huge selection of deals across Amazon's storefront, and there are already many deals you can get on sale ahead of the event. Note: MacRumors is an affiliate partner with Amazon. When you click a link and make a ...
airpods pro 2

AirPods Pro 3 to Help Maintain Apple's Place in Earbud Market Amid Increasing Low-Cost Competition

Thursday July 3, 2025 7:25 am PDT by
Apple's position as the dominant force in the global true wireless stereo (TWS) earbud market is expected to continue through 2025, according to Counterpoint Research. The forecast outlines a 3% year-over-year increase in global TWS unit shipments for 2025, signaling a transition from rapid growth to a more mature phase for the category. While Apple is set to remain the leading brand by...

Top Rated Comments

stridemat Avatar
122 months ago
to be expected when people use BitTorrent, I have zero sympathy for people who pirate stuff!
Whilst most the time both go hand in hand, BitTorrent is just a method of file transfer and not directly related to piracy.
Score: 52 Votes (Like | Disagree)
8692574 Avatar
122 months ago
Cant really blame Apple for data loss if you
(a) Don't make regular backups
(b) Install bit torrent clients (from a website no less) Which have little or no legitimate use other than piracy
to be expected when people use BitTorrent, I have zero sympathy for people who pirate stuff!
Torrent are used for more than piracy my friend, we are not in the early 2000 anymore!!

All Linux distribution are downoadable with torrent and they are 100% legit!
Score: 32 Votes (Like | Disagree)
elcdbot Avatar
122 months ago
Lol, I don't think I've met an even SLIGHTLY savvy computer user (Mac or PC) in the last eight years or so that uses a client other than uTorrent.
Given that ALL torrent apps are free, why would anyone download this????????
Stability and no ads. Never had a problem with Transmission as my default client.
Score: 27 Votes (Like | Disagree)
mnsportsgeek Avatar
122 months ago
Apparently it only affects users who downloaded it off of the website and not those who used the in app update.
Score: 27 Votes (Like | Disagree)
TheHorrorNerd Avatar
122 months ago
... if you use time machine
Cant really blame Apple for data loss if you
(a) Don't make regular backups
(b) Install bit torrent clients (from a website no less) Which have little or no legitimate use other than piracy
Score: 26 Votes (Like | Disagree)
Weaselboy Avatar
122 months ago
Looks like Apple has updated XProtect for this KeRanger malware already. This is from my xprotect.plist file.



Attachment Image
Score: 24 Votes (Like | Disagree)