They also threw black paint at the building and bottles, which reached the balcony of the third floor, where the Greek Consulate is housed.
According to the account of an eye-witness, who alerted the police, the vandals spoke fluent German.
The assailants left an unsigned proclamation at the scene with an anti-capitalist content, calling their attack an act of solidarity with those who have recently faced "state terrorism".
The German police are investigation the circumstances of the attack and are searching for the perpetrators.
German FM deplores Greek Consulate vandalism
German Foreign Minister Guido Westerwelle, in a communication he had with his Greek counterpart Dimitris Droutsas, expressed regret for acts of vandalism targeting the Greek Consulate in Berlin, it was announced on Friday.
The German foreign minister said that such actions were condemnable and do not reflect Germany’s feelings toward Greece, adding that all efforts will be made to arrest the culprits and bring them to justice.
German Deputy Foreign Minister Wolf-Ruthart Born has contacted the Greek ambassador to Berlin on the issue as well.