The apparent hack comes just ahead of the one-year anniversary of the death of Mahsa Amini, the Iranian woman who died in police custody.

The newly emerged hacking collective has hit targets in a range of NATO countries amid an overall increase in hacktivism.

SiegedSec, a group known for politically motivated hacks and leaks, posted a link to the files in a Telegram channel.

A group that previously hacked Fort Worth, Texas, claimed a cyberattack that affected Halliburton, Shell, Helix Energy and Oceaneering.

Pro-Russian hackers are focused on Ukrainian service providers, media, critical infrastructure and collecting data from government networks.

Banking services in Russia may have been disrupted by the attack, which comes amid a Ukrainian counteroffensive.

Cyberattacks targeting Ukraine are mostly carried out by Russian intelligence agencies or state-sponsored groups, according to the official.

The group has put Latin American governments, politicians and corporations on notice that it can expose their secrets.

The group identified as Emennet Pasargad has been using "false-flag campaigns under the guise of multiple personas," the bureau said.