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Computer virus definition

A computer virus is a form of malicious software that piggybacks onto legitimate application code in order to spread and reproduce itself.

Like other types of malware, a virus is deployed by attackers to damage or take control of a computer. Its name comes from the method by which it infects its targets. A biological virus like HIV or the flu cannot reproduce on its own; it needs to hijack a cell to do that work for it, wreaking havoc on the infected organism in the process. Similarly, a computer virus isn’t itself a standalone program. It’s a code snippet that inserts itself into some other application. When that application runs, it executes the virus code, with results that range from the irritating to the disastrous.

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Hacking groups closely linked to the Russian government have made nearly 40 destructive attacks against hundreds of Ukrainian targets since the start of the invasion, according to a report issued by Microsoft.

The attacks have been largely, but not exclusively, targeted at Ukrainian government institutions, and Microsoft’s report noted that these attacks have had damaging effects on the country’s economy and civilian population, in addition to Ukraine’s government and military.

Operating under the apparent direction of three main groups — the GRU military intelligence service, SVR interior ministry and FSB security service — Russian-backed hackers undertook a huge range of offensive cyberoperations against Ukraine, ranging from phishing campaigns and misinformation to data theft and the destruction of critical systems, Microsoft said.

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Microsoft has a comprehensive report on the dozens of cyberattacks — and even more espionage operations — Russia has conducted against Ukraine as part of this war:

At least six Russian Advanced Persistent Threat (APT) actors and other unattributed threats, have conducted destructive attacks, espionage operations, or both, while Russian military forces attack the country by land, air, and sea. It is unclear whether computer network operators and physical forces are just independently pursuing a common set of priorities or actively coordinating. However, collectively, the cyber and kinetic actions work to disrupt or degrade Ukrainian government and military functions and undermine the public’s trust in those same institutions.

[…]

Threat groups with known or suspected ties to the GRU have continuously developed and used destructive wiper malware or similarly destructive tools on targeted Ukrainian networks at a pace of two to three incidents a week since the eve of invasion. From February 23 to April 8, we saw evidence of nearly 40 discrete destructive attacks that permanently destroyed files in hundreds of systems across dozens of organizations in Ukraine.

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