The Marcher Trojan was first discovered in the wild around three years ago; however, malware does not remain the same for very long, so it is no surprise to see yet another Marcher Trojan variant appear. This time the method of attack differs substantially from previous incarnations of this money-stealing malware.
Marcher Trojan Delivered Using Fake Adobe Flash Update
This time, attackers are targeting users of online pornography and are attempting to trick them into installing the Marcher Trojan on their Android phones by disguising the malware as an Adobe Flash installer package. Adobe Flash may be on its last legs, but a considerable number of porn websites host Flash videos. Users of pornographic websites therefore need Adobe Flash in order to view adult videos.
The attackers are targeting users of pornographic websites by sending links to new porn sites via SMS messages and spam email. Clicking the links contained in those messages will direct the user to a malicious website where they are asked to download an update to Adobe Flash.
Adobe Flash updates are frequently released due to the high number of zero-day vulnerabilities discovered in the software. Users are therefore likely to think there is nothing untoward about the update. The attackers have named it AdobeFlashPlayer.apk to make the download appear genuine.
After downloading the update, the user is required to change settings on the phone to allow apps from unknown sources to be installed. They are then asked to give the fake Adobe Flash update administrator privileges. Once installed, the owner of the device will be unaware that they have just compromised their Android phone.
The malware will then start communicating with the attackers C&C server and will send a list of the apps installed on the device to the attackers. That information is then used to display the appropriate fake login screens for apps installed on the device. Those login screens record bank and credit card details and send them to the attackers.
Another method of attack used by the malware is to send a MMS message to the user asking them to download the X-Video porn app from the Google Play store. The X-Video app is not malicious and can be installed for free; however, after installing the app the user receives a fake prompt asking them to update their Google Play credit card information.
The Marcher Trojan can also prevent users from visiting the real Google Play store without first entering their payment card details into the fake Google Play payment screen.
Fortunately, the malware is easy to remove. The app can be deactivated and then uninstalled. But the user would need to know they have been infected in order to do that.
Blocking Adult Content to Protect WiFi Network Users
Any business that allows employees to access WiFi network can improve network security by blocking access to adult websites. Preventing WiFi network users from accessing adult sites and other websites commonly used to deliver malware can greatly improve security posture.
The Marcher Trojan is being used to steal money from Android users, although the malware has been used to deliver at least 50 different payloads. Other Trojan downloaders deliver ransomware and other nasty malware. Once on a network the malicious software can cause a considerable amount of damage.
WebTitan can be used to prevent the downloading of files commonly used by hackers to hide malware such as SCR, EXE, and ZIP files. It can also be used to block access to risky websites and those known to contain malware.
For business WiFi networks, a web filter is now becoming less of an option and more of a necessity to prevent malware and ransomware downloads and keep users’ devices and networks malware free.