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Wednesday, 26 July 2017 10:07

Source code for SLocker Android ransomware leaked online

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A security researcher has leaked the source code for the SLocker Android ransomware online and invited others to help in its further development.

The researcher, who uses the pseudonym fs0c1ety, said he had obtained the source code by reversing a sample of the ransomware. "It’s not the original source code," he wrote, adding that the code, which was released on GitHub. was to be used only for the purpose of research.

SLocker was first spotted in 2015 and was the first Android ransomware.

According to an analysis by Trend Micro earlier this month, the SLocker family "is one of the oldest mobile lock screen and file-encrypting ransomware and used to impersonate law enforcement agencies to convince victims to pay their ransom".

A new variant of the ransomware was spotted in June, according to this analysis.

SLockerSLocker runs in the background after it infects a mobile device, encrypting selected files. It can also make the device inaccessible.

According to Trend Micro, it disguises itself as game guides, video players, and similar apps to lure users into installing it.

"When installed for the first time, its icon looks like a normal game guide or cheating tool. Once the ransomware runs, the app will change the icon and name, along with the wallpaper of the infected device," the analysis said.

It added: "We see that the ransomware avoids encrypting system files, focuses on downloaded files and pictures, and will only encrypt files that have suffixes (text files, pictures, videos). When a file that meets all the requirements is found, the thread will use ExecutorService (a way for Java to run asynchronous tasks) to run a new task.

"The new task will use a method named 'getsss' to generate a cipher based on the previously generated random number. This method computes the MD5 of the random number and selects 16 characters as a string from the hexadecimal representation of the MD5.

"After the string is generated, the ransomware will feed it to SecretKeySpec to construct the final key for AES before using AES to encrypt files."


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Sam Varghese

Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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