CCleaner an most popular app in play store known  for optimizing the performance of phone has now become the affected app for millions of users.

The app which has a high rating on Google Play and has been downloaded by more than 50 million Android users,  was compromised “in a sophisticated manner” in August.

We estimate that 2.27 million people used the affected software,” said Piriform. “We resolved this quickly and believe no harm was done to any of our users.”the problem was  spotted and fixed in mid-September . The company says it released safe versions of both programs within three days, but the modified version of the software had been available for a month.

The company says that the malicious code attempted to connect computers with recently registered web domains – a common tool used by hackers to download further malware onto infected computers.

The security company Avast, determined the problem on the 12th of September that the 32-bit version of our CCleaner v5.33.6162 and CCleaner Cloud v1.07.3191 products, which may have been used by up to 3% of our users, had been compromised in a sophisticated manner.
 The data which has been sent to the server creates no indication to the  company. Working with US law enforcement, It caused this server to be shut down on the 15th of September before any known harm was done

Piriform's vice president of products, Paul Yung, said: "We would like to apologize for a security incident that we have recently found in CCleaner version 5.33.6162 and CCleaner Cloud version 1.07.3191

"A suspicious activity was identified on September 12 2017, where we saw an unknown IP address receiving data from software found in version 5.33.6162 of CCleaner, and CCleaner Cloud version
1.07.3191, on 32-bit Windows systems.

"Based on further analysis, we found that the 5.33.6162 version of CCleaner and the 1.07.3191 version of CCleaner Cloud was illegally modified before it was released to the public, and we started an investigation process.

"Before delving into the technical details, let me say that the threat has now been resolved in the sense that the rogue server is down, other potential servers are out of the control of the attacker, and we're moving all existing CCleaner v5.33.6162 users to the latest version," he said.

"Users of our cloud version have received an automated update. For all other users, if you have not already done so, we encourage you to update your CCleaner software to version 5.34 or higher."

The latest version of CCleaner is available to download here

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