A group of hackers is using a previously undocumented backdoor program designed to interact with attackers over Slack. While abusing legitimate services for malware command-and-control purposes is not a new development, this is the first time researchers have seen Slack, a popular enterprise collaboration tool, being used in this way.
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The backdoor was detected by security firm Trend Micro in a targeted attack launched from the compromised website of an organization called the Korean American National Coordinating Council that posts articles related to North and South Korean politics. The technique of infecting websites that are of interest to a particular group of individuals or organizations is known as a “watering hole” attack.
Source:: IT news – Security