The recent high-profile Cellebrite data breach, which saw a vigilante hacker reportedly break into the Israeli phone hacking firm's systems made headlines for the nature of the attack.
Around 900GB data was reportedly stolen in the attack, which has angered David Vincenzetti, CEO of Italian surveillance firm Hacking Team, who lashed out at "vigilante hackers" and the damage they caused to legitimate firms.
In a show of solidarity, Vincenzetti sent a message to Cellebrite, writing that the recent breach was "hardly something to celebrate".
Hacking Team has itself been the victim of a similar cyberattack in 2015, which saw a hacker going by the pseudonym "Phineas Fisher" claim responsibility for hacking into the surveillance company's system and leaking 400GB data online.
Vincenzetti claimed that these hackers target companies they dislike and launch targeted cyberattacks in efforts to "destroy" them.
"Self-appointed 'prosecutors,' 'judges' and 'executioners', these secret operators believe it is their mission to attack by whatever means available companies that provide investigative tools to law enforcement," Vincenzetti wrote, according to Motherboard.