In January 2023 Kaspersky researchers reported on a new domain name system (DNS) changer functionality used in the Roaming Mantis campaign. Now cybercriminals can use compromised Wi-Fi routers in cafes, airports hotels, and other public places to potentially infect more Android smartphones with the Wroba.o malware. At the moment, the new technique targets users in South Korea, but it can be soon implemented in other countries as well.
Roaming Mantis (a.k.a Shaoye) is a cybercriminal campaign first observed by Kaspersky in 2018. It uses malicious Android package (APK) files to control infected Android devices and steal device information. It also has a phishing option for iOS devices and crypto-mining capabilities for PCs. The name of the campaign is based on its propagation via smartphones roaming between Wi-Fi networks, potentially carrying and spreading the infection.
New DNS changer functionality to attack more users via public routers
Kaspersky discovered that Roaming Mantis recently introduced a domain name system (DNS) changer functionality in Wroba.o (a.k.a Agent.eq, Moqhao, XLoader) – the malware that was primarily used in the campaign. A DNS changer is a malicious program that directs the device connected to a compromised Wi-Fi router to a server under the control of cybercriminals instead of a legitimate DNS server. On the malicious landing page, the potential victim is prompted to download malware that can control the device or steal credentials.
At the moment, the threat actor behind Roaming Mantis is exclusively targeting routers located in South Korea and manufactured by a very popular South Korean network equipment vendor. To identify them, the new DNS changer functionality gets the router’s IP address and checks the router’s model, compromising targeted ones by overwriting the DNS settings. In December 2022, Kaspersky observed 508 malicious APK downloads in the country.
An investigation of malicious landing pages found that attackers are also targeting other regions using smishing instead of DNS changes. This technique employs text messages to spread malicious links that direct the victim to a malicious site to download malware onto the device or steal user info via a phishing website. According to Kaspersky Security Network (KSN) statistics in September – December 2022, the highest detection rate of Wroba.o malware (Trojan-Dropper.AndroidOS.Wroba.o) was in France (54.4%), Japan (12.1%), and the U.S. (10.1%).
“When an infected smartphone connects to ‘healthy’ routers in various public places like cafes, bars, libraries, hotels, shopping malls, airports, or even homes, Wroba.o malware can compromise these routers and affect other connected devices as well. The new DNS changer functionality can manage all device communications using the compromised Wi-Fi router, such as redirecting to malicious hosts and disabling updates of security products. We believe that this discovery is highly critical for the cybersecurity of Android devices because it is capable of being widely spread in the targeted regions,” said Suguru Ishimaru, Senior Security Researcher at Kaspersky.
In order to protect your internet connection from this infection, Kaspersky researchers recommend the following:
- Refer to your router’s user manual to verify that your DNS settings haven’t been tampered with or contact your ISP for support.
- Change the default login and password for the admin web interface of the router and regularly update your router’s firmware from the official source.
- Never install router firmware from third-party sources. Avoid using third-party repositories for your Android devices.
- Further, always check browser and website addresses to ensure they are legitimate; look for signs such as https when asked to enter data.
- Consider installing a mobile security solution to protect your devices from these and other threats.