Malware strains targeting all versions of MacOSX

People regularly anticipate that in case you’re strolling OSX, you’re highly secure from malware. But that is turning into much less and less real, as evidenced via brand new strain of malware encountered with the aid of the Check Point research team.

Checkpoint said This new malware – dubbed OSX/Dok — influences all versions of OSX, has zero detections on VirusTotal (as of the writing of these words), is signed with a legitimate developer certificate (authenticated by means of Apple), and is the primary fundamental scale malware to target OSX users thru a coordinated email phishing campaign.

The Malware strain discovered by checkpoint researchers targeting OSX users mostly in European countries.

For instance, one phishing message turned into determined to target a person in Germany by using baiting the user with a message regarding supposed inconsistencies of their tax returns (see image, and translation, under).

 Malware strains targeting all versions of MacOSX
Source: checkpoint
Attackers get whole access to all information exchange, such as communique encrypted by means of SSL. This is done by means of redirecting victim traffic thru a malicious proxy server.

Malware Execution

The malware package consists of a.Zip archive named Dokument.Zip. It became signed on April 21th, 2017 via a “Seven Muller” and the package name is Truesteer.AppStore.

Once executed it moves to Users/Shared/ folder and then ready to execute from different locations.

Malware strains targeting all versions of MacOSX
Source: checkpoint

It will show a message the package is damaged and cannot execute.If a loginItem named “AppStore” exists, the malware will delete it, and as a substitute add itself as a loginItem, to be able to persist within the device and execute routinely each time the device reboots.

It will do the same process until payload installation successfully completed.And then it will pop up a window asking to update and try to get user’s credentials.

The victim is barred from gaining access to any windows or the usage of their system in any manner until they relent, enter the password and permit the malware to finish installing.

Then it will install additional tools like TOR(used to connect dark web) and SOCAT(multipurpose relay).

The malware then modifies the victim machine’s network settings such that every one outgoing connection will bypass thru a proxy, that is dynamically acquired from a Proxy AutoConfiguration (PAC) document sitting on a malicious server.

Then after that, it will install a bogus certificate on the victim machine to launch an MITM attack to impersonate any websites.

security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain /tmp/cert.der

Malware strains targeting all versions of MacOSX
Source: checkpoint

Launch Agents


As an end result of all of the above actions, whilst trying to surf the net, the consumer’s web browser will first ask the attacker web page on TOR for proxy settings.

The consumer traffic is then redirected through a proxy managed via the attacker, who consists of out a Man-In-the-Middle assault and impersonates the diverse websites the user tries to surf.

The attacker is free to study the victim’s visitors and tamper with it in any way they like.When achieved, the malware will delete itself.

Checkpoint alerts users to beware of Trojans bearing gifts, especially if they ask for your root password. Sample hash – 7819ae7d72fa045baa77e9c8e063a69df439146b27f9c3bb10aef52dcc77c1454131d4737fe8dfe66d407bfd0a0df18a4a77b89347471cc012da8efc93c661a5

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  1. The sample purports to originate from the Swiss tax authorities, not Germany. The text is is badly written: there are missing diacritcs simulated by double quotes, and only the first sentence has a resemblance to real German. The rest is gabbledigook composed from standard terms and conditions collected online.

    At any rate, I had to help an unfortunate victim by advising him to do a complete restore from a time machine backup before the infection. Even well educated people seem to be prone to ignore warning signs when expect trouble from the tax authorities.

    What I wonder though is if the certificates has already been revoked and how one could get Apple and Comodo to do this as fast as possible?

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