Lukas Stefanko

Lukas Stefanko

Malware Researcher


Education: Masters in Informatic Engineering of the Technical University in Kosice

Highlights of your career? Malware Researcher

Position and history at ESET? Joined ESET as a Malware Researcher in 2011

What malware do you hate the most? Adware and ransomware

Favorite activities? Gym, squash, reading

What is your golden rule for cyberspace? Be reasonably paranoid

Favorite computer game/activity? Elasto Mania


71 articles by Lukas Stefanko

Less Technical

Porn clicker trojans at Google Play: An analysis

Porn clicker trojans at Google Play: An analysis

Less Technical

Porn clicker trojans at Google Play: An analysis

ESET researchers have found a large campaign of malicious porn clicker type apps on Google Play. These trojans belong to a single family of malicious apps masquerading as popular games and/or applications. They are designed and systematically modified to bypass Google’s security checks.

Lukas Stefanko24 Feb 20163 min. read


ESET research

The rise of Android ransomware

The rise of Android ransomware

ESET research

The rise of Android ransomware

Lock-screen types and file-encrypting “crypto-ransomware”, both of which have been causing major financial and data losses for many years, have made their way to the Android platform. ESET has prepared a topical white paper on the growth of this insidious Android malware.

Robert Lipovsky and Lukas Stefanko18 Feb 20165 min. read


ESET research

Android AdDisplay using anti-bouncer technique

Android AdDisplay using anti-bouncer technique

ESET research

Android AdDisplay using anti-bouncer technique

In order to help make Google Play a safer place for Android users, ESET continues to monitor the official Android app market for malicious or potentially unwanted applications.

Lukas Stefanko08 Oct 20154 min. read


ESET research

Android trojan drops in, despite Google’s Bouncer

Android trojan drops in, despite Google’s Bouncer

ESET research

Android trojan drops in, despite Google’s Bouncer

ESET recently discovered an interesting stealth attack on Android users, an app that is a regular game but with an interesting addition: the application was bundled with another application.

Lukas Stefanko22 Sep 20156 min. read


ESET research

Aggressive Android ransomware spreading in the USA

Aggressive Android ransomware spreading in the USA

ESET research

Aggressive Android ransomware spreading in the USA

The latest ESET discovery of the first known Android lock-screen-type ransomware that spreads in the wild and sets the phone's PIN lock is examined.

Lukas Stefanko10 Sep 20155 min. read


ESET research

Porn clicker keeps infecting apps on Google Play

Porn clicker keeps infecting apps on Google Play

ESET research

Porn clicker keeps infecting apps on Google Play

A recently identified trojan porn clicker is still infecting apps on Google Play.

Lukas Stefanko23 Jul 20152 min. read


ESET research

ESET uncovers another porn clicker on Google Play

ESET uncovers another porn clicker on Google Play

ESET research

ESET uncovers another porn clicker on Google Play

Porn clickers pretending to be the the Dubsmash application have found their way back onto Google Play, a month after being removed.

Lukas Stefanko28 May 20154 min. read


ESET research

Scareware: Fake Minecraft apps Scare Hundreds of Thousands on Google Play

Scareware: Fake Minecraft apps Scare Hundreds of Thousands on Google Play

ESET research

Scareware: Fake Minecraft apps Scare Hundreds of Thousands on Google Play

ESET has discovered over 30 scareware apps available for download from the Google Play store. The apps have been installed by more than 600,000 Android users.

Lukas Stefanko22 May 20153 min. read