TheDefend is a fake serurity software (rogue) from the Winisoft family (GuardPcs, IGuardPc, SiteAdware, AntiTroy, AntiKeep, AntiAdd, RESpyWare, REAnti, KeepCop, SiteVillain, LinkSafeness, SecureKeeper, AntiAID, System Warrior, System Veteran, System Fighter, Block Protector, Block Keeper, Block Scanner, Block Watcher, SoftBarrier, Shield Safeness, Soft Stronghold, Soft Veteran, SoftCop, Soft Soldier, Trust Fighter, Trust Soldier, Safe Fighter, Trust Cop, Secure Warrior, Secure Fighter, Secure Veteran, Security Soldier, Security Fighter, Save Armor, Save Defender, Trust Warrior, Soft Safeness, Safety Keeper, Save Keeper, Quick Heal Cleaner, System Cop, Block Defense, Save Defense, Trust Ninja, Save Soldier, Save Keep, Winishield, Wini Fighter, WiniBlueSoft)
TheDefend comes from fake online antivirus scanners or fake video codecs, creates random files on the system and detects them as infected. It also display a lot of disturbing warning messages to scare users.
If your PC is infected with some of the WiniSoft family rogue, use MBAM to remove the infection.
Thanks to Bharath.