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A look at Russian GRU Unit 29155's hacking department, which started out in 2012, and its involvement in cyber warfare and disinformation campaigns (The Insider)
https://theins.press/en/inv/281731

Hidden Bear: The GRU hackers of Russia’s most notorious kill squad
Russian GRU Unit 29155 is best known for its long list of murder and sabotage ops, which include the Salisbury poisonings in England, arms depot explosions in Czechia, and an attempted coup d’etat in Montenegro. But its activities in cyberspace remained in the shadows — until now. After reviewing a trove of hidden data, The Insider can report that the Kremlin’s most notorious black ops squad also fielded a team of hackers — one that attempted to destabilize Ukraine in the months before …