consent.exe -- suspect, not flagged by NIS or MBAM

marco75

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My new i5 Win7 system was assembled in November 2011 and has been stable since then.
Windows Security Essentials was installed and worked normally.
It has two identical HDD in RAID 0 mirror volume (intel RST systray applet), cached onto 120 GB SSD using Intel Smart Response Technology (SRT)

A few days ago, my system started having intermittent lockups and freezes.
Most commonly, the Start menu would become unresponsive – the buttons would no longer highlight under the mouse pointer, clicking produces ‘ding!’ sound.
Windows + E would produce an RPC error message
Task Manager shows multiple consent.exe threads, no accompanying confirmation dialog
When the system locks up, only a hardware reset would enable a restart.
On reset, the cache rebuilds and the system halts after the RAID BIOS screen. After a second reset, Windows loads and on login, intel RST verifies RAID data integrity. Both cache rebuild and RAID verification are successful.

I have scanned the system with Malwarebytes Anti-malware (1 trojan found and removed) and Norton Internet Security (100 tracking cookies, threat assessment: “mild”, removed). I have also run sfc /scannow in a cmd.exe window with admin privileges.

I suspect that C:\Windows\system32\consent.exe (112,000 bytes) on my system is malware: For instance, Start > All Programs > Accessories > Command Prompt (right-click) Run as administrator will start another consent.exe, the start menu stops working, and the command prompt window does not appear.

I think the genuine consent.exe is more like ~87,000 bytes, can’t remember exactly.

Any advice on how to fix this without wiping everything and starting from scratch would be greatly appreciated.

Thank You for reading! ^_^
 

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Windos 7 Home Premium 64-bit
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Windos 7 Home Premium 64-bit

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Windows 8 Prointel i3 2.40 Ghz6 GB RAMIntegrated Intel HD
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DELL
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Windows 8 Pro
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intel i3 2.40 Ghz
Motherboard
DELL inc
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6 GB RAM
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Integrated Intel HD
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Realtek high definition SRS surround sound
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1366*768
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320 GB
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Windows 7 Ultimate 32bit SP1Intel(R) Core(TM)2 Quad CPU @ 2.40GHz, 2400 MHz4 GBATI Radeon HD 2600 Pro
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Bruce ... somewhere in his 40's
OS
Windows 7 Ultimate 32bit SP1
CPU
Intel(R) Core(TM)2 Quad CPU @ 2.40GHz, 2400 MHz
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INTEL/D975XBX2
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4 GB
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ATI Radeon HD 2600 Pro
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Samsung SyncMaster 914v
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1280 x 1024
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2/500GB each ... ST3500630AS ATA Device.
One is not connected
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Rocketfish 700 W
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G.Skill Gigabyte Chassis
Keyboard
Standard PS/2 Keyboard
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Microsoft PS/2 Mouse
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DSL
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Avira Internet Security
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IE 11
Other Info
ATI HDMI Audio
consent.exe = UI for admin apps (UAC)

W7 x64 SP1 -
Code:
[FONT=LUCIDA CONSOLE] Directory of C:\Windows\system32

11/20/2010  08:32           112,000 consent.exe
               1 File(s)        112,000 bytes[/FONT]
 

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