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@MSGID: <4a80ff89ecbaae585c766edc4929a0a5@dizum.com>
87a5b910
@REPLYADDR Nomen Nescio <nobody@dizum.com>
@REPLYTO 2:5075/128 Nomen Nescio
@CHRS: CP866 2
@RFC: 1 0
@RFC-Message-ID:
<4a80ff89ecbaae585c766edc4929a0a5@dizum.com>
@TZUTC: 0200
@TID: FIDOGATE-5.12-ge4e8b94
? 2023 AO Kaspersky Lab
Understanding the Threat
The malware consisted of two Trojans, Trojan.Floxif and
Trojan.Nyetya, inserted into the free versions of CCleaner version
5.33.6162 and CCleaner Cloud version 1.07.3191. It`s believed the
hackers compromised CCleaner`s build environment to insert the
malware.
According to different reports, the malware is capable of collecting
specific data from an infected computer system, including IP
addresses and information on installed and active software, and
sending it to a third-party server located in the United States.
CCleaner`s parent company, Avast Piriform, found the malware on
September 12, 2017, and immediately took steps to remediate the
problem. Initially, the company believed it was confined to the above
versions running on a 32-bit Windows systems and that downloading
upgraded versions of the program would solve the problem. It`s
believed more than 2 million users were infected.
Unfortunately, the company soon discovered the malware infection was
more severe than originally believed. A second stage payload was
discovered by Cisco Talos. This payload targeted approximately 20 of
the largest tech companies, including Google, Microsoft, Cisco, and
Intel, and infected 40 computers.
According to Wired, "Cisco says it obtained a digital copy of the
hackers` command-and-control server from an unnamed source involved
in the CCleaner investigation. The server contained a database of
every backdoored computer that had `phoned home` to the hackers`
machine between September 12 and 16".
Although there is no definitive evidence identifying the party
responsible for the CCleaner malware, investigators discovered a link
to a Chinese hacking group known as Axiom.
The CCleaner malware shares code with tools used by Axiom, and a time
stamp on a compromised server matched a Chinese time zone; however,
time stamps can be changed or modified, making it difficult to
pinpoint origin.
Combined with the choice of tech targets, this raised concerns that
CCleaner malware could be part of a state-sponsored attack. As of
late 2017, the investigation into responsibility for the hack is
ongoing.
How to Get Rid of CCleaner Malware?
When the CCleaner malware was first discovered, users were advised to
upgrade to the newest version of the program based on the belief it
was an isolated incident and later versions were safe. However, the
discovery of the second stage payload complicated removal and
protection.
Having a disaster recovery plan in place may be the only way to truly
ensure your computer is free of the CCleaner malware. Investigators
recommend restoring systems to backed-up versions dating before
August 15, when the first infected tools were released.
The infected version of CCleaner should be uninstalled and antivirus
scans initiated to ensure the system is clean. If you decide to
reinstall CCleaner, it should be the most recent version available,
or at least version 5.34 or higher.
CCleaner is known to be an excellent tool for eliminating malicious
programs that hide deep in computer systems, but as the CCleaner
malware incident proves, even the programs created to protect our
computers from threats are not immune to hackers.
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