Based on that pool address the attacker seems to be mining Batcoin, not Bitcoin, which is appears to be an scrypt-based altcoin, far more profitable to CPU mine

Based on that pool address the attacker seems to be mining Batcoin, not Bitcoin, which is appears to be an scrypt-based altcoin, far more profitable to CPU mine than Bitcoin. (In case anyone was wondering why an attacker was bothering to mine Bitcoin with a CPU).