The Check Point research team recently uncovered a new Android malware campaign on Google Play, which it calls: Viking Horde. The malware campaign is being used for fraud, DDoS attacks and to send spam.
Viking Horde conducts ad fraud, but can also be used for other attack purposes such as DDoS attacks, spam messages, and more. At least five instances of Viking Horde managed to bypass Google Play malware scans so far.
Check Point notified Google about the malware on 5 May 2016.
On all devices — rooted or not — Viking Horde creates a botnet that uses proxied IP addresses to disguise ad clicks, generating revenue for the attacker. A botnet is a group of devices controlled by hackers without the knowledge of their owners. The bots are used for various reasons based on the distributed computing capabilities of all the devices. The larger the botnet, the greater its capabilities.
On rooted devices, Viking Horde delivers additional malware payloads that can execute any code remotely, potentially compromising the security of data on the device. It also takes advantage of root access privileges to make itself difficult or even impossible to remove manually.
Meet the Horde
The most widely-downloaded instance of Viking Horde is the app: Viking Jump, which was uploaded to Google Play on 15 April 2016, and has achieved 50,000 – 100,000 downloads. In some local markets, Viking Jump is a Google Play top free app.
The oldest instance is Wi-Fi Plus, which was uploaded to Google Play on 29 March 2016. Other instances include the apps Memory Booster, Parrot Copter, and Simple 2048. All Viking Horde-infected apps have a relatively low reputation which the research team speculates may be because users have noticed the odd behaviour, such as asking for root permissions.
The botnet created by the attackers spread worldwide to users from various targeted countries. The Check Point research team collected data on the distribution of victims from one of the many Command & Control servers (C&C’s) used by attackers, which is illustrated below:
How Viking Horde Works
From its research of Viking Horde’s code and the C&C servers used in the attack, our research team can illustrate the malware process flow.
1. The malware is first installed from Google Play. While the app initiates the game, it installs several components, outside of the application’s directory. The components are randomly named with pseudo-system words from a preset list, such as core.bin, clib.so, android.bin and update.bin. They are installed on the SD card if the device is not rooted, and to root/data if it is. One of these files is used to exchange information between the malware’s components. A second file contains the list of the generated names of the components, to make them available to all components.
2. The malware then checks whether the device is rooted:
- If the device is rooted, the malware initiates two additional components:
app_exec. Implements communication protocol with the server.
app_exec_watch_dog Binary implements update and persistency mechanism. Watchdog monitors app_exec process and restarts it if needed.
- If the device is not rooted, the malware loads app_exec file as a shared library and calls its functions by JNI – Java Native Interface, which allows Java code run native binaries
In both scenarios, once app_exec application is installed, it establishes a TCP connection with the C&C server and starts the communication. The communication consists of the following commands:
- Ping. Every 10 seconds application sends 5 bytes to the server. The server responds with the same 5 bytes.
- Update of device information: Sends to server charge battery, type of connection and phone number.
- The next step is to accomplish the main malicious functionality by creating an anonymous proxy connection. The C&C sends a “create_proxy” command with two IP addresses and ports as parameters. These IP addresses are used to open two sockets one for a remote server (which is a client of the botnet exploiting the anonymous proxy) and the other for the remote target. Then it reads the data received from the first socket and channels it to the target host. Using this technique, the malware developer (or someone using this botnet as “malware as a service”) can hide his IP behind the infected device’s IP.
It is important to understand that even if the device is not rooted, Viking Horde turns the device into a proxy capable of sending and receiving information per the attacker’s commands. Below is an example of an infected device as seen from an attacker’s C&C. The remoteIP is the proxy’s IP, and the socksIP is the C&C server’s IP. The C&C contains some information about the device including its OS version, battery status, and GPS coordinates. In this case, the device is located in the US on T-Mobile.
The botnet is controlled by many C&C servers, each managing a few hundred devices. The malware’s primary objective is to hijack a device and then use it to simulate clicks on advertisements in websites to accumulate profit. The malware needs this proxy to bypass ad-nets’ anti-fraud mechanisms by using distributed IPs.
Some user reviews of the app also claim it sends premium SMS messages, as seen in the screen capture below. This botnet could be used for various malicious purposes, such as DDoS attacks, spamming and delivering malware.
Vikings are a Persistent Horde
The malware uses several techniques to remain on the device. First, Viking Horde installs several components with system-related names, so that they are hard to locate and uninstall.
If the device is rooted, two more mechanisms are set in place:
The app_exec component monitors the main application’s existence. If the user uninstalled the main application, app_exec decrypts a component called com.android.security and silently installs it. This component will be hidden, and run after boot. This component is a copy of itself and has the same capabilities.
The watchdog component installs the app_exec component updates. If app_exec is removed, the watchdog will reinstall it from the update folder.
Apparently, some users even noticed this activity:
Bonus component for rooted devices
Perhaps the most dangerous functionality is the update mechanism. The update mechanism is split between app_exec and watchdog components. app_exec downloads the new binary from the server and stores it to /data directory with the app_exec_update name.
Watchdog periodically checks if an update file exists and replaces app_exec with this file. This means that upon the server’s command, Viking Horde downloads a new binary. The watchdog component will replace the application with it. This allows downloading and executing any remote code on the device.
Win a Poster Heater with Gadget and Takealot.com
This winter Gadget and Takealot.com are giving away three Poster Heaters, which look like posters but become heaters when you plug them in.
Three Gadget readers will each win a unit, valued at R550 each. To enter, follow @GadgetZA and @Takealot on Twitter and tell us on the @GadgetZA account how many Watts the heater consumes.
What’s the big deal about these heaters? Many of us are struggling to keep the balance between soaring electricity costs and the need to keep warm this winter.
However, the recently launched Poster Heater by EasyHeat and distributed in South Africa by Takealot.com is not only one of the most cost effective electric heaters currently on the market, it is also easy to setup and use.
As the name indicates, it is a poster similar to one you would hang on a wall. But, plug it in and it turns into a 300 Watt heater. The Poster Heater isn’t designed to heat hallways or large rooms, but rather smaller ones like a bedroom or a baby’s nursery or a dressing room.
It uses radiant heating, which means that it heats up in a couple of minutes and the heat is directed at the objects or people around it, quickly taking the chill out of the air and providing a comfortable ambient temperature.
The other advantage of radiant heating is that it doesn’t dry out the air like infrared or gas heaters. Users also don’t have to worry about their children or pets getting too close to it because, even though it gets hot, it can be touched.
To enter the competition follow the steps below:
Competition entry details:
3. The competition closes on 31 July 2018.
4. Winners will be notified via Twitter on 1 August and Takealot.com will be in touch to organise delivery.
5. The competition is only open to South African residents.
Deezer to host Hotstix’s Mandela tribute playlist
Deezer is celebrating Nelson Mandela on the centenary of his birthday by hosting a tribute playlist created by music legend Sipho “Hotstix” Mabuse.
Mabuse, a legendary figure in African music, first rose to prominence in the 1970s with his band Harari and later developed a name for himself as a solo artist. One of his best known songs was the global hit BurnOut in the 1980s.
The playlist takes the listener on a captivating musical journey through the life of Nelson Mandela. It was compiled by Mabuse, who consulted with Mandela’s family and friends to ensure that the music would be relevant and accurate. The playlist also features commentary by Mabuse, which was recorded in his Soweto home.
“I have tried to tell the story of the music that Madiba loved,” says Mabuse. “The Playlist excludes the time in prison obviously, as Madiba would not have had exposure to music in that time. We have focused on the music we know he loved before and after that period. This recording was really an emotional journey for me, but an incredible opportunity to document these memories.”
The playlist features the music the young Mandela loved, such as The Manhattan Brothers, Solomon Linda, Brenda Fassie and Miriam Makeba. It includes struggle songs from Chicco, Johnny Clegg, Hugh Masekela and Yvonne Chaka Chaka. The playlist also includes Mandela by Zahara, one of the younger artists who caught Madiba’s ear.
Mabuse also offers stories of his own songs, such as Shikisha, a song greatly beloved by the former President.
“I was delighted to share my thoughts and hope the listeners enjoyed the musical journey,” says Mabuse. “Madiba did enjoy music immensely and we all have a purpose wherever we are in the world to celebrate culture and to learn from different cultures and music forms and styles.”
This playlist was inspired by the Nelson Mandela 100 campaign, calling on corporates and individuals to act as sources of inspiration and engage in conversation and action.