Analyzing a variant of the GM Bot Android malwareSecurity Affairs

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Analyzing a variant of the GM Bot Android malwareSecurity Affairs

Исходный код банковского трояна для Android утек в сеть

Analyzing a variant of the GM Bot Android malwareSecurity Affairs

Android malware по-взрослому. Самые популярные вирусные техники 2017 года

Analyzing a variant of the GM Bot Android malwareSecurity Affairs

The leaked code for the malware and its control panel have since been further propagated to different users, making this popular Android Trojan accessible to fraudsters for free, with a tutorial and server-side installation instructions to match. GM Bot will be available to cybercriminals who can recompile the code, create new variants and use the leaked sources to build, sell or deploy this malware for fraud scenarios. How was this source code leaked? And why? When it comes to cybercriminals selling malware in underground venues, black-hat vendors simply cannot control what their buyers may do with the malware once it is in their possession. As they say: Leaks happen! While GM Bot may not be as prolific as the major banking Trojans mentioned here, it is definitely a game changer in the realm of mobile threats. Its source code leak, similar to the Zeus leak, is likely to give rise to many variations of this sort of malware. The fraudster that leaked the code threw in an encrypted archive file of the GM Bot malware source. He indicated he would give the password to the archive only to active forum members who approached him. That version is called MazarBot , and it is just as popular among cybercriminals. GM Bot is mobile malware that emerged in late in the Russian-speaking cybercrime underground. Beyond that overlay screen capability, GM Bot can intercept SMS messages sent to the mobile devices it infects and act like spyware that grabs and exfiltrates data from infected devices. This makes GM Bot a banking Trojan for the Android OS since it enables cybercriminals to gather enough information for illicit money transfers out of victim accounts. GM Bot further allows criminals to customize fake screens, which enables them to harvest payment card information. This turnkey capability is the true differentiator. The reverse was also true: Phishers and PC Trojan operators could not facilitate fraudulent transactions without mobile malware to intercept the SMS codes or calls from the bank. In the information security sphere, we often hear about cybercriminals sharing information and collaborating in underground boards. This case is an excellent example: Actors have access to cybercrime advice from a fraudster who knows his way around online fraud, along with the actual malware source code to help readers set up their own mobile botnet. While it is useful, the advice is not meant for the novice crowd. The post illustrates the value of the malware and how to monetize it, but the leaked malware and control panel source codes would not mean much to the nontechnical, inexperienced fraudster readers who never compiled malicious code on their own. Per the post, the solution to these fraud prevention measures is not to outsource the necessary help to cybercrime-as-a-service CaaS vendors but rather to buy a mobile bot and use it to harvest the necessary information. The online banking scenario in the resulting cases is going to be account takeover — the initiation of the fraudulent transaction from a computer or mobile device the fraudster owns. The malware was since detected and renamed by a few other security vendors, but the actual code base is the same and not considered to be a different Trojan. Since technical analysis of this malware is already available from different sources, IBM X-Force mobile threat researchers only examined the leaked source and control panel. Each command is rather self-explanatory and shows that malware can control the SMS relay from infected mobiles, as well as the call forwarding. This is part of the tactics used by fraudsters when they plan to intercept two-factor authorization codes sent from the bank and want to prevent the victim from questioning the SMS. Records include stolen information that is parsed into credit card details, lists of apps installed on infected devices, bank accounts the victims hold, other types of compromised accounts collected by the malware, data from online forms filled out by the victims and data stolen by customized HTML forms pushed to the victims. With that capability, it can eavesdrop, intercept and send out new SMS messages as it pleases. In Android OS versions above v4. The options are available to the attacker from the control panel. Each option allows for further parameter definition in the simplistic user interface. The customizable part of the GM Bot is its ability to target new apps and entities by setting up new fake overlay screens injections directly from the control panel. That option is enabled by simply feeding the code into the user interface and dispatching it to the infected devices. The specific code will pop up upon the launch of the applications specified in the App Filter section. Note that for the more recent overlay Trojans circulating in the wild, some overlay windows are static, hard-coded into the malware. They are launched as soon as infected users open the target banking application, their Google Play store app or any other app the attacker chooses to target. Some hashes from the samples X-Force mobile threat researchers worked with appear below. Some extracts from the underground forum post appear in this appendix. Imagine that your phone is now infected by malware. The attacker can now read content on your phone, but that is not enough. Now we have something that is just like injections! Nothing unusually difficult! Any injection looks like a perfect fake page, the goal of which is to obtain info from the unsuspecting victim — hence, a fake window that overlays on top of the main window and features the exact same design. The injection asks for the exact info that is required to access the online banking account and for transactions to be authorized. Security Intelligence. In short, mobile banking Trojans such as GM Bot are a one-stop fraud shop for criminals: They launch fake overlay windows that mimic bank applications to steal user credentials and payment card details. They can forward phone calls to a remote attacker. They have spyware features and can control the device via remote commands. An Example of Cybercrime Collaboration In the information security sphere, we often hear about cybercriminals sharing information and collaborating in underground boards. The Injection Configuration Module The customizable part of the GM Bot is its ability to target new apps and entities by setting up new fake overlay screens injections directly from the control panel. SHA Hashes Bda1fd0c1f7bb44f0b4fd7fbdf3fff76f5cba fcaf3b12e1f1d83bbfbaec2fdae dc5bcf14b2acbefac99b4c57be2a2dac69ee0defc14d7 ca47fdf2dbd58f2fdaaeee1b9d Appendix Some extracts from the underground forum post appear in this appendix. The account holder does the following: 1. User unwittingly opens a bank app 2. Our injection is momentarily overlaid on top of the app 3. Holder enters their login info 4. Info is sent to admin panel! Share this article. She is a seasoned security advocate, public speaker, and a prolific a Press play to continue listening.

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Analyzing a variant of the GM Bot Android malwareSecurity Affairs

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Analyzing a variant of the GM Bot Android malwareSecurity Affairs

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We use cookies and similar technologies to recognize your repeat visits and preferences, to measure the effectiveness of campaigns, and improve our websites. For settings and more information about cookies, view our Cookie Policy. In the last three months, our mobile users encountered GM bot more than , times. Subsequently, the malware intercepts SMS to obtain two-factor authentication PINs, giving cybercriminals full access to bank accounts. In a nutshell, GM Bot is mobile banking malware that can gain full administrative rights of a device, and thus can intercept SMS and display overlays to steal valuable information. GM Bot first appeared on Russian darknet forums in Since then, its source code has leaked and a second version has been developed by its original creator, GanjaMan. GM Bot is a Trojan that looks like a harmless app on the surface, but is actually malicious. GM Bot often disguises itself as an adult content app or a plug in app, like Flash. The app persistently requests administrative rights. If granted these rights, the malware can cause serious damage. With full administrative rights, GM Bot knows and can control everything happening on an infected device. The malware springs into action when an app from its list, which mainly consists of banking apps, is opened. A list of banks a GM Bot variant is currently imitating can be found below. When an app targeted by GM Bot is opened, the malware can display an overlay, which is a page on top of the one you should be seeing, that looks very similar like to the app you have open. This social engineering technique is used to deceive users into giving up personal and sensitive information. This means that new variants with new and different capabilities are constantly being created. We have seen a significant rise in the number of GM Bot samples since its code was leaked. Our friends at McAfee , for example, have found variants of GM Bot whose overlay request users scan the front and back side of their identification card. I took a deeper look at the sample McAfee analyzed and discovered that the following banks and services across the world are imitated by the GM Bot variant :. Install an antivirus app, like Avast Mobile Security. A good antivirus app will detect and block malware, like GM Bot, before it can infect your device. While third party app markets may offer apps that cannot be found on trusted sources or may offer premium apps for free, their offers can be too good to be true. Be careful which apps you give administrative rights to. Administrative rights are powerful and give an app and whoever is behind it full control of your device. Unveiling the Avast business brand. Learn why we created this symbol of our commitment to keeping businesses safe online. Avast Mobile Security scans and protects Android smartphones and tablets from malware and phishing. I Accept. Visit avast. What exactly is GM Bot? Related articles. Business Security One new logo. Infinite possibilities. Discussion 0. Never miss our news. Follow us.

Analyzing a variant of the GM Bot Android malwareSecurity Affairs

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