Android mobile operating system is often in the news for being targeted by cyber criminals. Now, keeping up with its legacy another Android malware has been discovered by Internet security giant McAfee which acts as a ransomware and threatens users that their personal data will be leaked online if they fail to pay money.
Dubbed LeakerLocker; the ransomware malware does not encrypt users files but demands money and claims to have a backup copy of user data including sensitive data. This data includes personal photos, contact numbers, sent and received SMS, phone calls history, Facebook messages, Chrome visits history, full email texts and GPS location history which will be leaked online unless it receives “a modest ransom.”
The malware was discovered in two applications on Google Play Store known as Wallpapers Blur HD and Booster & Cleaner Pro. The Wallpapers Blur HD app was downloaded 5,000 and 10,000 times while 1,000 and 5,000 users downloaded Booster & Cleaner Pro.
In the case of Wallpapers Blur HD researchers noted that a user is questioning the app’s suspicious device permission including accessing calls records, accessing contacts, reading and sending SMS, etc.
Although both apps look normal upon installation, they hide a malicious payload. Furthermore, LeakerLocker locks the home screen, accesses user data and asks for payment with a warning message.
According to McAfee blog post, “When a victim inputs a credit card number and clicks “Pay,” the code send a request to the payment URL with the card number as a parameter. If the payment succeeds, it shows the information “our personal data has been deleted from our servers and your privacy is secured.” If not successful, it shows “No payment has been made yet. Your privacy is in danger.” The payment URL comes from the server; the attacker can set different destination card numbers on the server.”
Mcafee has already informed about the infected app and at the time of publishing this article, both apps were apparently removed from the Play Store. However, the question remains unanswered that how these malware apps bypassed Google’s security all the way and made it to Google Play Store?
This is not the first time when researchers have discovered ransomware apps targeting Android users. A few week ago, a fake PornHub app infected users‘ device with ransomware malware while a month ago attacks targeted Android users with WannaCry ransomware’s copycat WannaLocker.
Android users are advised not to download unnecessary apps and use reliable anti-virus software. Those looking for more information on these two apps are advised to visit McAfee’s blog post.
Sponsored: DDoS attacks are increasing, calculate the cost and probability of a DDoS attack on your business with this DDoS Downtime Cost Calculator.
![[hlink][/hlink] CPDoS can be used to attack content delivery networks (CDNs) to serve error pages instead of legitimate sites through caching. Freshly termed as a Cache Poisoned Denial of Service (CPDoS) attack, two academics from the Cologne University of Applied Sciences in Germany have discovered [PDF] how content delivery networks can be attacked to serve error pages instead of legitimate sites through caching. In normal circumstances, when the user re-visits a website, they are served a cached version of it through a content delivery network such as Cloudflare. On the other hand, during the poisoning process, the attacker visits a website with the intention of generating a request for the web page from the CDN. However, the request, in this case, contains a malformed header which can be from the following 3 options: [wp_ad_camp_2] [wp_ad_camp_1] An HTTP Header Oversize (HHO) An HTTP Meta Character (HMC) An HTTP Method Override (HMO) Any of these, in turn, cause an error on the webserver. As a part of regular operations, the error page is then cached on the CDN and in turn served to legitimate users. Slowly, it spreads to other nodes of the CDN as they are updated hence giving the impression of the site being unavailable globally successfully completing the attack. This could cause both a reputational loss and financial losses as well for mission-critical websites. This was further confirmed by the researchers themselves along the lines of, To get a clearer picture on the real life impact of CPDoS attacks, we took some samples based on the URLs from the Alexa Top 500, DoD, and HTTP Archive data sets. Overall, we found twelve vulnerable resources within a few days. These also include mission-critical websites such as ethereum.org, marines.com, and nasa.gov which use CloudFront as CDN. At all these websites, we were able to block multiple resources including scripts, style sheets, images, and even dynamic content such as the start page. [hlink][/hlink] Example screenshot on Marines.com website: An example showcased by the researchers of a before and after scenario of the attack on Marines.com. For those of you wondering when your site is getting poisoned, you can relax and luckily take a series of precautions. The first one is that you could turn off the caching of HTTP error pages by default on your CDN service through predefined options or by editing your server's configuration files. Hence, the error page will never be distributed by the CDN en masse. [wp_ad_camp_2] [wp_ad_camp_1] Secondly, you could make sure your CDN provider is complying with standard caching protocols. One of these involves caching only certain error pages such as the "404 Not Found" but not others such as the "400 Bad Request" one which is generated because of such an attack. A table allowing one to analyze the errors different CDN providers cache. Continuing with the often seen pattern in the cybersecurity world, these revelations were also followed with responsible disclosure leading to companies like Microsoft and Amazon taking action to fix the problem at hand. However, some companies like Flask have still not responded according to the researchers and so it is yet to be seen how the customers of such firms will react. For users looking to do further research on the subject in more detail, they can visit a recently released website by the team at CPDOS. CPDoS variation - HTTP Header Oversize (HHO) from BleepingComputer.com on Vimeo. Did you enjoy reading this article? Kindly do like our page on Facebook and follow us on Twitter.](https://hackread.com/wp-content/uploads/2019/10/cache-poisoned-denial-of-service-cpdos-with-cdn.png)
