Qatadah narrates from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to pray two rak'ahs sitting after the witr; in the first rak'ah he recited Umm al-Qur'an, that is, Surah al-Fatihah, and "When the earth is shaken" [Surah al-Zalzalah: 1], and in the second rak'ah "Say: O disbelievers" [Surah al-Kafirun: 1].
Abu Ghalib and Utbah bin Abi Hakim are both not strong.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4824