A targeted cyber-spying mission waged by a notorious hacking team out of Vietnam preyed mainly on Android users in Southeast Asia and evaded detection in Google Play, APKpure, and other app markets for five years. 

Researchers at Kaspersky today revealed details of their study of the attack campaign they call PhantomLance, which they believe is the handiwork of OceanLotus. While Kaspersky has a policy of not tying attack groups with specific nation-states, OceanLotus long has been believed to be a Vietnamese advanced persistent threat (APT) group. PhantomLance — which targets Android — has managed to stay alive by changing up its malware along the way to evade detection.

Alexey Firsh, security researcher with Kaspersky, says he and his team decided to dig deeper into a Trojan backdoor that was first revealed in a July 2019 report by researchers at Dr. Web. The relatively unusual backdoor, they found, dated back to at least December 2015, the registration date of one of the domains used in the campaign, according to Firsh. The latest sample of the spying malware was present in apps on Google Play in November 2019, he says, when Kaspersky notified Google. The apps, which were a mix of dozens of consumer utility-type apps such as ad blockers, Flash plug-ins, cache cleaners, and updaters, as well Vietnamese apps for locating nearby bars and churches, were then removed from the Google Play store.

Unlike most malicious mobile apps, PhantomLance is all about targeting, and not wide-net infections or promoting its installation. The attackers created several versions of the backdoor, with dozens of samples, and when an app first went up in Google Play or other app stores, it didn’t contain malware: That was added later in the form of an update, after the user had installed it. That’s likely what allowed the apps to pass any app store vetting.

There have been some 300 attack attempts on Androids in India, Vietnam, Bangladesh, and Indonesia, since 2016.

OceanLotus, aka APT32, for years has been spotted targeting Vietnamese citizens and dissidents and journalists, as well as industries in Germany, China, the Philippines, the US, and the UK, in traditional cyber espionage fashion. The group, believed to be backed by the Vietnam government, in 2014 hacked a European company that planned to build a manufacturing plant in Vietnam, as well as a hospitality developer in 2016 that was looking to do business in Vietnam. 

Opsec Game on Point
The malware performs the usual spy stuff, gathering geolocation information, call logs, contact lists, and SMS messages, as well as information on the victim’s device, such as model, operating system, and installed apps. “But we see that it also has the ability to execute special shell commands from the [C2] server and download additional payloads on the victim’s device,” Firsh explains.

Another tactic the attackers employed: creating a fake developer profile on GitHub to appear as a legitimate app developer. “I think the main reason they have those accounts is to start background stories to developers to look more legitimate to moderators of the marketplaces,” explains Lev Pikman, a Kaspersky researcher who worked with Firsh on the PhantomLance research. 

Firsh says the attack group employs different encryption keys, separate infrastructures, and other methods to cover its tracks. “They are pretty good at opsec,” he says.

While defending against a nation-state is not so simple, the best bet is to have a mobile security tool or service for devices and to be wary of apps you download, experts say.

The researchers presented their findings at Kaspersky’s online Security Analyst Summit today, which was kicked off by Eugene Kaspersky, founder and CEO of Kaspersky, who cited an increase in malicious online activity since much of the world went into quarantine stay-at-home due to the COVID-19 pandemic. “Now [attackers] have many more opportunities to do their business,” Kaspersky said. “We have seen a 10% increase in the new malware we collect. … In some specific nations, we see … more attempts at attack.”

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Kelly Jackson Higgins is the Executive Editor of Dark Reading. She is an award-winning veteran technology and business journalist with more than two decades of experience in reporting and editing for various publications, including Network Computing, Secure Enterprise … View Full Bio