DOROS HADJIZENONOS, Country Manager of Check Point South Africa, explores why mobile ransomware has become the biggest mobile security threat, and how users can guard against it.
Imitation is a quick way to learn, which is why mobile malware is evolving so rapidly – it frequently imitates attack behaviours and trends that were first trialled and proven to work in the PC world. Mobile ransomware is following this path, with the aim of replicating the success that PC-based ransomware has had in extorting money from individuals and organisations. So it’s no surprise that the number of mobile ransomware variants detected in Q1 2016 grew 45% compared with Q4 2015.
Like its cousins that target PCs, mobile ransomware has become more complex and malicious in the way it works, too. The first mobile ransomware types were ‘screen blockers’, which displayed prominent alerts and made normal interaction with the screen impossible – similar to lock-screen PC ransomware. First seen in 2013, the malware posed as anti-virus software and informed victims their device was infected, demanding they purchased a full version of the software to ‘disinfect’ the device and make it usable again.
In 2014 the first mobile ransomware which encrypts files was detected, again following the success of Windows cryptolocker-style malware. The most recent mobile ransomware type is the Pin locker, which emerged in 2015. One example, called PornDroid, pretends to be a porn player, and tricks the user into granting it Admin privileges. Once it has these, the malware changes users’ Pin codes, locking them out of their devices and displaying a ransom message. We conducted a detailed investigation into how this type of ransomware worked, and we found one variant had infected tens of thousands of devices, with some victims paying $200 to $500 to unlock their data and regain control of the device.
The device divide
While mobile ransomware currently targets Android devices almost exclusively – largely because iOS devices need to be jailbroken in order to download apps from sources other than Apple’s App Store, making them harder to infect – there has been a case in which iOS users were extorted. In 2015, attackers exploited stolen credentials to log into users’ iCloud accounts and remotely locked their devices, and demand ransoms to release them. And in March 2016, the first ransomware targeting Apple Macs, KeRanger, was discovered, so we should expect to see ransomware targeting iOS devices soon.
Check your privilege
Currently, mobile ransomware focuses on locking users out of the device, because the mobile operating systems do not allow malware to access all the device’s areas of memory or storage. However, the privilege escalation exploits referenced earlier point clearly to the next step in ransomware evolution, using techniques to gain ‘root’ privileges on the device which effectively give the criminal complete control of the infected phone or tablet.
Most methods for rooting the device rely on exploiting vulnerabilities either in the OS, the hardware, or individual applications. Unfortunately, these vulnerabilities are widespread: over the past 6 months, over half of Android patches released by Google are for securing devices against privilege escalation exploits – so we can expect to see more ransomware targeting these flaws to gain elevated privileges over the next year.
How can I protect my devices?
The most fundamental principle of mobile device security is never to root or jailbreak your phone – in other words, to avoid deliberate privilege escalations that could then leave you open to malicious ones that may harbour ransomware. A robust security solution should also be applied. Enterprises should select a mobile device management (MDM) solution – but all MDMs are not equal. Some are able to identify when a phone has been deliberately rooted by a user, but not when it has been rooted by malware – and some more advanced malware can disguise itself against such inspection.
A more effective approach is to quarantine and inspect any suspicious apps or attachments in the cloud, before downloading them to the device. This blocks the main vector for privilege escalation, which is from rogue apps.
The mobile threat prevention solution should use a number of components working together to respond to the most common mobile attack vectors. Devices must be continually analyzed to uncover system vulnerabilities and unusual behaviour. Monitoring configuration and behaviour analysis can help identify root access attempts as outlined above. And any downloaded apps must be inspected for the unique binary signatures for known malware; they should also be captured and reverse-engineered for code-flow analysis to expose suspicious behaviour.
And don’t overlook simple steps such as regularly backing-up data on your device so that if the worst does happen, you can recover your files without having to pay.
Help! I’ve already been infected
Unfortunately, there may be little you can do, which is why it’s important to perform regular backups of the data stored on your mobile device. You should certainly avoid paying any ransom, and take your device to a mobile security specialist rather than attempting to decrypt it yourself. But ultimately, when it comes to mobile ransomware, prevention is by far the best protection.
CES: So long, and thanks for all the beer!
Last week, the Las Vegas expo showed off its fun side with state-of-the-art technologies for enjoying beer, writes BRYAN TURNER
From craft beer-making machines to robots that pour beer, CES had more beer than usual in Las Vegas last week. And even free beer if you found the right stand. Stampede’s saloon-style booth offered beer to visitors who tried out its latest drones, virtual reality, and other gaming products. No beer tech, though.
Here are some of the beer technologies that stood out:
LG HomeBrew – Craft beer made at home
LG’s HomeBrew craft beer-making machine, debuted at CES 2019, brings the brewing process home thanks to single-use capsules, a self-cleaning feature, and an algorithm optimised for fermentation.
Like a Nespresso coffee machine, the beer maker uses capsules, which contain malt, yeast, hop oil and flavouring. At the press of a button, LG HomeBrew automates the whole procedure from fermentation and carbonation to ageing. A companion app lets users check HomeBrew’s status at any time during the process, from their handsets.
The beer machine not only offers a simple way to make craft
Designed with discerning beer lovers in mind, HomeBrew allows for in-home production of batches of more than 4 litres of beer in a variety of styles. The following five distinctive, flavoured beers are available now:
- Hoppy American IPA
- Golden American Pale Ale
- Full-bodied English Stout
- Zesty Belgian-style Witbier
- Dry Czech Pilsner
The only catch? It takes about two weeks to make, depending on the beer type.
“LG HomeBrew is the culmination of years of home appliance and water purification technologies that we’ve developed over the decades,” said Dan Song, president of LG Electronics Home Appliance & Air Solutions Company. “Homebrewing has grown at an explosive pace, but there are still many beer lovers who haven’t taken the jump because of the barriers to entry, like complexity, and these are the consumers we think will be attracted to LG HomeBrew.”
Click here to read about the party speaker that holds beer and robots that pour beer.
CES: Alienware gets Legend-ary
At CES in Las Vegas last week, Dell’s Alienware released a family of high-end, thin, light, and affordable machines for both amateur and professional gamers – and a new identity.
Alienware marked CES 2019 as a brand milestone with the debut of a new design identity, Alienware Legend. It aims to set a new bar of excellence for what gamers want most – performance and function. Alienware says it evaluated multiple concepts and chose one that was the biggest and boldest departure from its current look.
Alienware Legend, says the company, stays true to the brand’s core design tenets, taking cues from its deep roots in sci-fi culture and its early industrial designs, to distinguish the brand from the rest of the industry. The new Legend design is optimised with cutting-edge thermal cooling technology to achieve and sustain overclocking power, improved AlienFX lighting, and ultra-thin screen borders. It also unveiled a new “three-knuckle hinge” design that reduces the overall dimension while creating a stronger assembly, all combining to yield a better gaming experience.
“We’re excited to come to this year’s CES with some truly groundbreaking products, next-gen software and strategic partnerships that will bring more people to experience PC gaming and advance the industry,” said Frank Azor, vice president and general manager of Alienware. “The legend design answers the call for more and better from our gaming community, and the new G Series laptops will make PC gaming even more accessible to those looking for high-performance gaming at a cost they can appreciate.”
Click here to read about Alienware Legend in action with the Area-51m and m-series laptops