We used to call the Internet the “information super-highway” back in the day, when connections were slow, bulletin boards and gopher were about as techie as it got. Those days are long gone, but something of the ‘highway’ has remained, like a bad smell, one that has come back to haunt us in 2017… The highway robber in the form of ransomware exploits !
The person who went about their villainy on the trade routes and highways of the world, extorting money and valuables from unsuspecting travellers with a simple threat –– ”your money or your life” –– reinforced of course with the trademark flintlock pistol and sabre.
Today’s highway robber is a lot more sophisticated and savvy. They take far less risk and turn to the latest technology to extort you out of your money by threatening your valuables. In this case your data, your technology and most probably your computing ability.
Of course, I’m talking now about ransomware, the threat that’s been in the news almost every day for the past couple of months. The tool of choice for the modern highway robber has become headline news around the world with variants such as WannaCry and the more recent Popcorn Time. Organizations around the world have been affected by this ransomware, from the UK National Health Service, through to the Russian Postal Service in the last few weeks.
Interestingly, WannaCry leverages a previously known vulnerability in the Windows operating system, which is alleged to have been hoarded by a national security agency of the USA. In this case a vulnerability which allowed the ransomware to be especially successful in both current and older versions of Windows, such as XP and Windows 7, by using a weakness in their inbuilt SMB networking functionality. Even when out of support, there are still organisations using Windows XP and putting themselves at risk.
Luckily however an enterprising security researcher managed to find a kill switch written into some variants of WannaCry, in the form of a phone-home domain which hadn’t been registered by the malware’s author. Registering the domain seemed to give these variants of the malware the dead letter box it was looking for in order to shut down, thus halting the attack.
After intense examination of WannaCry’s tactics by the security community, we now know the infection spread within organizations by means of leveraging SMB connections. And, while patching the known vulnerability (as the patch had been out for over a month) helps sqelch WannaCry’s ability to spread, there are a broad range of ransomware sources through which you can get infected, such as:
- Trojans – Perhaps the most common and the ransomware attack source we read the most about. Email attachments that contain malicious macro attachments are the chosen method here.
- Removable media – Perhaps the most likely ransomware source of infection for the majority of malware in an enterprise, whether it’s ransomware or something more nefarious. Especially for those organisations that don’t lock down their USB ports. USB sticks and removable media are a very simple way to infect a PC as users generally trust those devices. A study by Google and two US universities showed that dropping USB sticks in public places was a simple and effective way to trigger human curiosity, with a full 49% of the ‘bait USBs’ being plugged into a computer by people who found them. Imagine if those had been malicious?
- Malvertising – Malver-what-now? A portmanteau of malicious advertising. Where attackers compromise the weak infrastructure of an online ad network that serves adverts to legitimate websites. Therefore, when users view those adds, usually on well-known news websites, they can be used to trick browsers into downloading malware through the page display ads. Exploit kits such as Angler and Neutrino are often used as the initial dropper of the malware, which often then allows cyber criminals complete control of the infected endpoint. Ransomware is just one of the common outcomes of these watering-hole or drive-by attacks.
- Ransomware-as-a-Service – RaaS? Yes, it does exist, as one of the many ‘Crime-as-a-Service’ networks. (Yes, those exist too). RaaS allows criminals of any variety to use ransomware exploits and become instant cyber criminals, to the extent we’re seeing a drop off in classic crime like burglary, as RaaS is far a less risky ransomware source for them. RaaS and CraaS have given rise to vast affiliate networks too, where ransomware is easy to deploy and manage for almost anyone and where the earning potential is significant. I use this example to demonstrate the sophistication and motivation of the cybercriminals behind ransomware. Ignore them at your peril.
Of course, we’re used to thinking of ransomware as an email-specific or Trojan-based attack and that’s certainly the most common route it takes, but we should note that once ransomware makes its way into your business, ransomware creators will attempt to take as many routes possible to ensure as widespread an infection as is possible.
What all of these attacks and the breadth of ransomware sources show us is that it’s a live and hostile environment on the information super-highway and that for all the good we do, there are still people intent on exploiting, stealing, violating and pillaging our assets. Don’t be under any illusion they’re not motivated either; ransomware is a great money earner for them so don’t expect the attacks to die down anytime soon. Technologically not doing your best is not an option either. Sitting back hoping Windows XP or 7 will “struggle on for a little longer” or that those patches you didn’t deploy don’t matter is not a sensible strategy. Remember there are books written about hope not being a strategy, so don’t fall into that trap.
Patch your stuff, back up your valuables and keep an eye out for the highway robbers and those ransomware exploits.
Stay safe out there.