Undoubtedly. The combat force was mostly non-Russian after 1942, but reports indicate that the greater share of offenses was committed by the logistics troops (who also stood accused of hoarding liquor and food from the combat troops).

I recall being struck by comments recorded by the reporter Vasily Grossman in his "A Writer at War : a Soviet Journalist with the Red Army, 1941-1945" (trans. by Luba Vinogradova and Antony Beevor). When he asked a young recently-minted officer why he was permitting his men to commit atrocities against German civilians, he said that he did not feel that he had earned the right to order older veterans to restrain themselves. Nor was he sure if he'd be obeyed, or even if he'd survive, if he tried.

Returning to your original point, it was clearly illegal and in the (rare?) cases where unit culture and the circumstances permitted offenders were prosecuted. The sentence was sometimes death.