The claim made by the Mexican state-owned petroleum corporation Pemex that it had recovered from a Nov. 10 cyberattack was met with some skepticism, as published reports indicate the attack may be still affecting the company.

Pemex stated it had suffered a cyberattack that impacted about five percent of its computer equipment, but managed to contain the problem and is now operating normally. The company did not say what type of attack transpired, but emails obtained by Reuters point toward Pemex being hit with Ryuk ransomware. Cybercriminals are known to use Ryuk to target large enterprises.

“Petróleos Mexicanos operates normally. The operation of the operation and production systems of the company are not compromised,” according to a translation of a company statement.

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