Bittorrent for mac infection update#
Bittorrent for mac infection manual#
Bittorrent for mac infection Patch#
Bittorrent for mac infection software#
Bittorrent for mac infection code#

The first real example of Mac ransomware, this time the ransomware creators have clearly made an effort to create a genuine threat.Īs you’ll see later when we examine the handful of existing ransomware outbreaks affecting the Mac, there’s a good chance paying up won’t actually recover your files! Step 4: Unplug and disconnect storage

Bittorrent for mac infection update#

KeRanger ransomware within an authorised update for the Transmission BitTorrent client. Notably, like many Windows-based examples of ransomware, Filezip is unable to actually decrypt any files, so paying the ransom is pointless. When the user attempts to use the patcher app, Filezip instead encrypts the user’s files and then places a “README!.txt”, “DECRYPT.txt” or “HOW_TO_DECRYPT.txt” file in each folder listing the ransom demands (0.25 BitCoin around £335 at the time of writing in May 2017).

Bittorrent for mac infection software#

Patcher apps are designed to illegally modify popular commercial software like Adobe Photoshop or Microsoft Office so they can be used without purchase and/or a license code.

Bittorrent for mac infection manual#

If that is the case, ESET has provided manual removal instructions to the Transmission team, which has published them here.įinally, also note that the malicious disk image was named Transmission2.92.dmg while the legitimate one is Transmission-2.92.dmg (notice the hyphen).FileCoder / Filezip / Patcher (February 2017)įilezip ransomware masquerading as “patcher” apps that can be downloaded from piracy sites. If any of them exists, it means the malicious Transmission application was executed and that Keydnap is most likely running. $HOME/Library/Application Support/com.geticloud/ $HOME/Library/Application Support/.daemon/process.id $HOME/Library/Application Support/.daemon/icloudsyncd Volumes/Transmission/Transmission.app/Contents/Resources/License.rtf Applications/Transmission.app/Contents/Resources/License.rtf Thus, we advise anyone who downloaded Transmission v2.92 on August 28th or August 29th, 2016, to verify if their system is compromised by testing the presence of any of the following files or directories: The malicious application bundle was signed on August 28th, 2016, but it seems to have been distributed only on the following day. This will prevent future execution of this malware, or any other malware that could be signed with the same compromised key, once Apple revokes the key used in this incident.”ĮSET believes the malicious version of Transmission was distributed from the official Transmission site for about a day. “However,” he continued, “we suggest that OS X users check that the Gatekeeper security feature is enabled. “Because the Trojanized version of Transmission is validly signed, Gatekeeper would have let this Keydnap variant run, unlike in the previous case we reported,” says Nick FitzGerald, ESET Senior Research Fellow. This enables Keydnap to reach its onion-routed C&C server without the need of a Tor2Web relay such as onion.to.Īdvice from ESET Australia to avoid the infection

Bittorrent for mac infection Patch#

The patch ESET published on Github to unpack the executable file still works with the new variant.Ī significant change in the new version is the presence of a standalone Tor client. It is still packed with the modified UPX described in ESET’s earlier article about Keydnap. It’s different from the legitimate Transmission certificate, but is still signed by Apple and thus bypasses Gatekeeper protection.ĮSET found that Keydnap is now at verion 1.5.

Bittorrent for mac infection code#

The code responsible for dropping and running the malicious payload is astonishingly similar.Īs in the KeRanger case, a legitimate code signing key was used to sign the malicious Transmission application bundle. In both cases, a malicious block of code is added to the main function of the Transmission application.

Keydnap used the same technique to spread as a similar malware, known as KeRanger, discovered in March 2016. Don’t hesitate to let me know if you’d like an interview on this topic with Nick FitzGerald, Senior Research Fellow at ESET. Please see below or visit the ESET blog for further details about this malware. Last month, ESET researchers wrote about OSX/Keydnap, which was a new OS X malware at the time, built to steal the content of OS X’s keychain and maintain a permanent backdoor. Worse, this Trojanized version was distributed from the official website. By Admin Mac malware distributed via BitTorrent client application, Transmission – ESET researchĮSET researchers have discovered malware, known as OSX/Keydnap, that was spread via a recompiled version of the otherwise legitimate open source BitTorrent client application, Transmission.