Solved What are these CAB_nnnn_2,3,4,5,6 files in C:\Windows\Temp?

D

dsperber

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I have observed the every-few-hours creation of files in the C:\Windows\Temp folder of both my sister and brother-in-law's Win7 Pro x64 machines (Lenovo M93p both), which are on the same LAN in their house. They eventually consume all available free space on C, and other programs needing space then fail.

I have to delete the contents of C:\Windows\Temp to get things back to normal, but the process simply restarts and a day or two later the C partition is once again fully consumed with these file. And weirdly this is happening on both machines (which of course are essentially set up identically, both with MSE and MBAM installed).

We're talking about file names starting with CAB, created as shown in the following screenshot (sorted into reverse chronological sequence, newest first):

qmJrI9.jpg


I have a hunch these are somehow related to either Microsoft Security Essentials (and perhaps downloading of virus definition files? or log files??) or Malwarebytes Anti-Malware.

There are also two LOG files stored in the same C:\Windows\Temp folder, and I believe these are very relevant to explaining the mystery. I will post these two log files as "code".

(a) MpCmdRun.log

Code: 
-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignatureUpdate -ScheduleJob -ISU -RestrictPrivileges
 Start Time: ‎Wed ‎Nov ‎09 ‎2016 22:51:56

Run as Network Service
MpCmdRun: End Time: ‎Wed ‎Nov ‎09 ‎2016 22:51:56
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignaturesUpdateService -ScheduleJob -UnmanagedUpdate
 Start Time: ‎Wed ‎Nov ‎09 ‎2016 22:51:56

Start: Signatures Update Service
Update Started
Search Started (MU/WU update) (Path: http://www.microsoft.com)...
Search Completed 
Download Started...
Time Info - ‎Wed ‎Nov ‎09 ‎2016 22:52:12 Download Progress-
 Update Index:0 of 1 - 0%
Download Progress-
 Update Index:0 of 1 - 100%
Download Progress-
 Update Index:0 of 1 - 100%
Download Completed 
Download Completed 
Installation Started...
Time Info - ‎Wed ‎Nov ‎09 ‎2016 22:52:43 Installation Progress-
 Percent Complete:100,
 Current Update Index:0 (of 1)
Installation Progress-
 Percent Complete:100,
 Current Update Index:0 (of 1)
Installation Completed 
Update completed succesfully
End: Signatures Update Service
MpCmdRun: End Time: ‎Wed ‎Nov ‎09 ‎2016 22:52:43
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignatureUpdate -ScheduleJob -ISU -RestrictPrivileges
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 00:51:55

Run as Network Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 00:51:55
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignaturesUpdateService -ScheduleJob -UnmanagedUpdate
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 00:51:55

Start: Signatures Update Service
Update Started
Search Started (MU/WU update) (Path: http://www.microsoft.com)...
Search Completed 
Download Started...
Time Info - ‎Thu ‎Nov ‎10 ‎2016 00:52:10 Download Progress-
 Update Index:0 of 1 - 0%
Download Progress-
 Update Index:0 of 1 - 100%
Download Progress-
 Update Index:0 of 1 - 100%
Download Completed 
Download Completed 
Installation Started...
Time Info - ‎Thu ‎Nov ‎10 ‎2016 00:52:41 Installation Progress-
 Percent Complete:100,
 Current Update Index:0 (of 1)
Installation Progress-
 Percent Complete:100,
 Current Update Index:0 (of 1)
Installation Completed 
Update completed succesfully
End: Signatures Update Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 00:52:41
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignatureUpdate -ScheduleJob -ISU -RestrictPrivileges
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 02:51:55

Run as Network Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 02:51:55
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignaturesUpdateService -ScheduleJob -UnmanagedUpdate
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 02:51:55

Start: Signatures Update Service
Update Started
Search Started (MU/WU update) (Path: http://www.microsoft.com)...
Search Completed 
Update completed succesfully. no updates needed
End: Signatures Update Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 02:51:57
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignatureUpdate -ScheduleJob -ISU -RestrictPrivileges
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 04:51:55

Run as Network Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 04:51:55
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignaturesUpdateService -ScheduleJob -UnmanagedUpdate
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 04:51:55

Start: Signatures Update Service
Update Started
Search Started (MU/WU update) (Path: http://www.microsoft.com)...
Search Completed 
Download Started...
Time Info - ‎Thu ‎Nov ‎10 ‎2016 04:52:12 Download Progress-
 Update Index:0 of 1 - 0%
Download Progress-
 Update Index:0 of 1 - 100%
Download Progress-
 Update Index:0 of 1 - 100%
Download Completed 
Download Completed 
Installation Started...
Time Info - ‎Thu ‎Nov ‎10 ‎2016 04:52:53 Installation Progress-
 Percent Complete:100,
 Current Update Index:0 (of 1)
Installation Progress-
 Percent Complete:100,
 Current Update Index:0 (of 1)
Installation Completed 
Update completed succesfully
End: Signatures Update Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 04:52:53
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignatureUpdate -ScheduleJob -ISU -RestrictPrivileges
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 06:51:55

Run as Network Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 06:51:55
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignaturesUpdateService -ScheduleJob -UnmanagedUpdate
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 06:51:55

Start: Signatures Update Service
Update Started
Search Started (MU/WU update) (Path: http://www.microsoft.com)...
Search Completed 
Update completed succesfully. no updates needed
End: Signatures Update Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 06:51:58
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignatureUpdate -ScheduleJob -ISU -RestrictPrivileges
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 08:51:55

Run as Network Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 08:51:55
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignaturesUpdateService -ScheduleJob -UnmanagedUpdate
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 08:51:55

Start: Signatures Update Service
Update Started
Search Started (MU/WU update) (Path: http://www.microsoft.com)...
Search Completed 
Download Started...
Time Info - ‎Thu ‎Nov ‎10 ‎2016 08:52:11 Download Progress-
 Update Index:0 of 1 - 0%
Download Progress-
 Update Index:0 of 1 - 100%
Download Progress-
 Update Index:0 of 1 - 100%
Download Completed 
Download Completed 
Installation Started...
Time Info - ‎Thu ‎Nov ‎10 ‎2016 08:52:41 Installation Progress-
 Percent Complete:100,
 Current Update Index:0 (of 1)
Installation Progress-
 Percent Complete:100,
 Current Update Index:0 (of 1)
Installation Completed 
Update completed succesfully
End: Signatures Update Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 08:52:41
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignatureUpdate -ScheduleJob -ISU -RestrictPrivileges
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 10:51:55

Run as Network Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 10:51:55
-------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------
MpCmdRun: Command Line: "C:\Program Files\Microsoft Security Client\\MpCmdRun.exe" SignaturesUpdateService -ScheduleJob -UnmanagedUpdate
 Start Time: ‎Thu ‎Nov ‎10 ‎2016 10:51:55

Start: Signatures Update Service
Update Started
Search Started (MU/WU update) (Path: http://www.microsoft.com)...
Search Completed 
Update completed succesfully. no updates needed
End: Signatures Update Service
MpCmdRun: End Time: ‎Thu ‎Nov ‎10 ‎2016 10:52:02
-------------------------------------------------------------------------------------

(b) MpSigStub.log

Code: 
----------------------------------------------------------------------------------
Command:    MpSigStub.exe /program ANTIMALWARE /q
Running as administrator: yes
Start time: 11/9/2016 10:52 PM (version 1.1.13251.0)

=================================== ProductSearch ==================================

                 Microsoft Security Essentials:
         Status: Active                        
        Product: 4.10.205.0                    
         Engine: 1.1.13202.0                   
     Signatures: 1.231.1595.0                  
     NIS Engine: 2.1.12706.0                   
 NIS Signatures: 116.65.0.0                    

================================ PackageDiscovery ================================

Package files discovered:
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1595.0_TO_1.231.1613.0_MPASDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1595.0_TO_1.231.1613.0_MPAVDLTA.VDM._P (?.?.?.?)

               AM BDD:     
       Engine: Not included
  AS base VDM: Not included
  AV base VDM: Not included
 AS delta VDM: 1.231.1613.0
 AV delta VDM: 1.231.1613.0

================================ PatchApplication ================================

Patched mpasdlta.vdm to 1.231.1613.0
Patched mpavdlta.vdm to 1.231.1613.0

================================= MpUpdateEngine =================================

Package files for the engine update:
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1595.0_TO_1.231.1613.0_MPASDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1595.0_TO_1.231.1613.0_MPAVDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\mpasdlta.vdm (1.231.1613.0)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\mpavdlta.vdm (1.231.1613.0)

Updated from C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs (0x0)

================================= ValidateUpdate =================================

MpSigStub successfully updated Microsoft Security Essentials using the AM BDD package.

               Original:     Updated to: 
 AS delta VDM: 1.231.1595.0  1.231.1613.0
 AV delta VDM: 1.231.1595.0  1.231.1613.0

Deleted C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1595.0_TO_1.231.1613.0_MPASDLTA.VDM._P
Deleted C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1595.0_TO_1.231.1613.0_MPAVDLTA.VDM._P
End time: 11/9/2016 10:52 PM
----------------------------------------------------------------------------------

----------------------------------------------------------------------------------
Command:    MpSigStub.exe /program ANTIMALWARE /q
Running as administrator: yes
Start time: 11/10/2016 12:52 AM (version 1.1.13251.0)

=================================== ProductSearch ==================================

                 Microsoft Security Essentials:
         Status: Active                        
        Product: 4.10.205.0                    
         Engine: 1.1.13202.0                   
     Signatures: 1.231.1613.0                  
     NIS Engine: 2.1.12706.0                   
 NIS Signatures: 116.65.0.0                    

================================ PackageDiscovery ================================

Package files discovered:
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1613.0_TO_1.231.1619.0_MPASDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1613.0_TO_1.231.1619.0_MPAVDLTA.VDM._P (?.?.?.?)

               AM BDD:     
       Engine: Not included
  AS base VDM: Not included
  AV base VDM: Not included
 AS delta VDM: 1.231.1619.0
 AV delta VDM: 1.231.1619.0

================================ PatchApplication ================================

Patched mpasdlta.vdm to 1.231.1619.0
Patched mpavdlta.vdm to 1.231.1619.0

================================= MpUpdateEngine =================================

Package files for the engine update:
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1613.0_TO_1.231.1619.0_MPASDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1613.0_TO_1.231.1619.0_MPAVDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\mpasdlta.vdm (1.231.1619.0)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\mpavdlta.vdm (1.231.1619.0)

Updated from C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs (0x0)

================================= ValidateUpdate =================================

MpSigStub successfully updated Microsoft Security Essentials using the AM BDD package.

               Original:     Updated to: 
 AS delta VDM: 1.231.1613.0  1.231.1619.0
 AV delta VDM: 1.231.1613.0  1.231.1619.0

Deleted C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1613.0_TO_1.231.1619.0_MPASDLTA.VDM._P
Deleted C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1613.0_TO_1.231.1619.0_MPAVDLTA.VDM._P
End time: 11/10/2016 12:52 AM
----------------------------------------------------------------------------------

----------------------------------------------------------------------------------
Command:    MpSigStub.exe /program ANTIMALWARE /q
Running as administrator: yes
Start time: 11/10/2016 4:52 AM (version 1.1.13251.0)

=================================== ProductSearch ==================================

                 Microsoft Security Essentials:
         Status: Active                        
        Product: 4.10.205.0                    
         Engine: 1.1.13202.0                   
     Signatures: 1.231.1619.0                  
     NIS Engine: 2.1.12706.0                   
 NIS Signatures: 116.65.0.0                    

================================ PackageDiscovery ================================

Package files discovered:
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1619.0_TO_1.231.1629.0_MPASDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1619.0_TO_1.231.1629.0_MPAVDLTA.VDM._P (?.?.?.?)

               AM BDD:     
       Engine: Not included
  AS base VDM: Not included
  AV base VDM: Not included
 AS delta VDM: 1.231.1629.0
 AV delta VDM: 1.231.1629.0

================================ PatchApplication ================================

Patched mpasdlta.vdm to 1.231.1629.0
Patched mpavdlta.vdm to 1.231.1629.0

================================= MpUpdateEngine =================================

Package files for the engine update:
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1619.0_TO_1.231.1629.0_MPASDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1619.0_TO_1.231.1629.0_MPAVDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\mpasdlta.vdm (1.231.1629.0)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\mpavdlta.vdm (1.231.1629.0)

Updated from C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs (0x0)

================================= ValidateUpdate =================================

MpSigStub successfully updated Microsoft Security Essentials using the AM BDD package.

               Original:     Updated to: 
 AS delta VDM: 1.231.1619.0  1.231.1629.0
 AV delta VDM: 1.231.1619.0  1.231.1629.0

Deleted C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1619.0_TO_1.231.1629.0_MPASDLTA.VDM._P
Deleted C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1619.0_TO_1.231.1629.0_MPAVDLTA.VDM._P
End time: 11/10/2016 4:52 AM
----------------------------------------------------------------------------------

----------------------------------------------------------------------------------
Command:    MpSigStub.exe /program ANTIMALWARE /q
Running as administrator: yes
Start time: 11/10/2016 8:52 AM (version 1.1.13251.0)

=================================== ProductSearch ==================================

                 Microsoft Security Essentials:
         Status: Active                        
        Product: 4.10.205.0                    
         Engine: 1.1.13202.0                   
     Signatures: 1.231.1629.0                  
     NIS Engine: 2.1.12706.0                   
 NIS Signatures: 116.65.0.0                    

================================ PackageDiscovery ================================

Package files discovered:
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1629.0_TO_1.231.1641.0_MPASDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1629.0_TO_1.231.1641.0_MPAVDLTA.VDM._P (?.?.?.?)

               AM BDD:     
       Engine: Not included
  AS base VDM: Not included
  AV base VDM: Not included
 AS delta VDM: 1.231.1641.0
 AV delta VDM: 1.231.1641.0

================================ PatchApplication ================================

Patched mpasdlta.vdm to 1.231.1641.0
Patched mpavdlta.vdm to 1.231.1641.0

================================= MpUpdateEngine =================================

Package files for the engine update:
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1629.0_TO_1.231.1641.0_MPASDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1629.0_TO_1.231.1641.0_MPAVDLTA.VDM._P (?.?.?.?)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\mpasdlta.vdm (1.231.1641.0)
C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\mpavdlta.vdm (1.231.1641.0)

Updated from C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs (0x0)

================================= ValidateUpdate =================================

MpSigStub successfully updated Microsoft Security Essentials using the AM BDD package.

               Original:     Updated to: 
 AS delta VDM: 1.231.1629.0  1.231.1641.0
 AV delta VDM: 1.231.1629.0  1.231.1641.0

Deleted C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1629.0_TO_1.231.1641.0_MPASDLTA.VDM._P
Deleted C:\Windows\Temp\DBC2B160BA060F34BB15029FC66C52FB-Sigs\1.231.1629.0_TO_1.231.1641.0_MPAVDLTA.VDM._P
End time: 11/10/2016 8:52 AM
----------------------------------------------------------------------------------

The real questions are:

(a) where are they coming from and why?

(b) why aren't they being deleted once used?

I have run FULL scans using both MSE and MBAM, and both machines get a clean bill of health. I suspect it is the MSE and MBAM products themselves which are generating these CAB files.

Any ideas?
 

My Computer My Computer

At a glance

Windows 7 Pro x64 (1), Win7 Pro X64 (2)i5-3350p 3.1Ghz/6MB-cache (1); E8400 3.0Ghz/6...8GB PC3-12800 DDR3 (1); 4GB PC3-10600 DDR3 (2)ATI HD7750 (1), (see TV cards); ATI R7 250 (2)
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home-built, two systems (1) and (2)
OS
Windows 7 Pro x64 (1), Win7 Pro X64 (2)
CPU
i5-3350p 3.1Ghz/6MB-cache (1); E8400 3.0Ghz/6MB-cache (2)
Motherboard
ASUS P8Z77-V Pro (1); ASUS P5Q3 (2)
Memory
8GB PC3-12800 DDR3 (1); 4GB PC3-10600 DDR3 (2)
Graphics Card(s)
ATI HD7750 (1), (see TV cards); ATI R7 250 (2)
Sound Card
Realtek ALC892 HD Audio (1); Realtek ALC1200 HD Audio (2)
Monitor(s) Displays
Eizo HD2441W LCD, Eizo S2433W (1); Eizo 24" S2433W (2)
Screen Resolution
1920x1200, 1920x1200 (1); 1920x1200 (2)
Hard Drives
(1) 1TB SATA-II (7200RPM), 2x2TB SATA-III (7200RPM), 250GB SATA-III (10000RPM) for OS; 2x2TB external USB 3.0

(2) 320GB SATA-II (7200RPM), 750GB SATA-II (7200RPM), 150GB SATA-II (10000RPM) for OS; 2TB external USB 3.0
PSU
Nesteq ECS-6001 600W (1); Nesteq ECS-5001 500W (2)
Case
Acousti-Case 360 (1) and (2)
Cooling
Noctua NH-U12P SE2 for CPU, 2x120mm case fans (1) and (2)
Keyboard
IBM PS/2 (1) and (2)
Mouse
Logitech MX Revolution wireless (1); Microsoft wired (2)
Internet Speed
100mbps down / 10mbps up
Antivirus
Microsoft Security Essentials; Malwarebyte Anti-Malware Pro
Browser
Firefox
Other Info
Ceton InfiniTV 4-tuner cablecard-enabled TV card as well as Hauppauge HVR-2250 OTA/ATSC 2-tuner TV card in (1), running under Win7 WMC

My Computer My Computer

At a glance

Microsoft Windows 7 Home Premium 64-bit 7601 ...AMD C-60 APU with Radeon(tm) HD Graphics4.00 GBAMD Radeon HD 6290 Graphics
Computer type
Laptop
Computer Manufacturer/Model Number
ASUS
OS
Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
CPU
AMD C-60 APU with Radeon(tm) HD Graphics
Motherboard
ASUSTeK COMPUTER INC. X501U
Memory
4.00 GB
Graphics Card(s)
AMD Radeon HD 6290 Graphics
Sound Card
(1) AMD High Definition Audio Device (2) Realtek High Defi
Screen Resolution
1366 x 768 x 32 bits (4294967296 colors) @ 60 Hz
Hard Drives
Hitachi HTS545050A7E380 SATA Disk Device
Antivirus
Comodo CIS & FW, SecureAplus App Whitelisting, Threatfire
Browser
Cyberfox 64bit, Opera 64bit, Airfox
Other Info
Spy-The-Spy, HitmanPro.Alert, Norton Connect Safe, MJRegWatcher, BitDefender TrafficLight, Voodoo Shield, Zemana AntiMalware

My Computer My Computer

At a glance

Windows 7 Pro x64 (1), Win7 Pro X64 (2)i5-3350p 3.1Ghz/6MB-cache (1); E8400 3.0Ghz/6...8GB PC3-12800 DDR3 (1); 4GB PC3-10600 DDR3 (2)ATI HD7750 (1), (see TV cards); ATI R7 250 (2)
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home-built, two systems (1) and (2)
OS
Windows 7 Pro x64 (1), Win7 Pro X64 (2)
CPU
i5-3350p 3.1Ghz/6MB-cache (1); E8400 3.0Ghz/6MB-cache (2)
Motherboard
ASUS P8Z77-V Pro (1); ASUS P5Q3 (2)
Memory
8GB PC3-12800 DDR3 (1); 4GB PC3-10600 DDR3 (2)
Graphics Card(s)
ATI HD7750 (1), (see TV cards); ATI R7 250 (2)
Sound Card
Realtek ALC892 HD Audio (1); Realtek ALC1200 HD Audio (2)
Monitor(s) Displays
Eizo HD2441W LCD, Eizo S2433W (1); Eizo 24" S2433W (2)
Screen Resolution
1920x1200, 1920x1200 (1); 1920x1200 (2)
Hard Drives
(1) 1TB SATA-II (7200RPM), 2x2TB SATA-III (7200RPM), 250GB SATA-III (10000RPM) for OS; 2x2TB external USB 3.0

(2) 320GB SATA-II (7200RPM), 750GB SATA-II (7200RPM), 150GB SATA-II (10000RPM) for OS; 2TB external USB 3.0
PSU
Nesteq ECS-6001 600W (1); Nesteq ECS-5001 500W (2)
Case
Acousti-Case 360 (1) and (2)
Cooling
Noctua NH-U12P SE2 for CPU, 2x120mm case fans (1) and (2)
Keyboard
IBM PS/2 (1) and (2)
Mouse
Logitech MX Revolution wireless (1); Microsoft wired (2)
Internet Speed
100mbps down / 10mbps up
Antivirus
Microsoft Security Essentials; Malwarebyte Anti-Malware Pro
Browser
Firefox
Other Info
Ceton InfiniTV 4-tuner cablecard-enabled TV card as well as Hauppauge HVR-2250 OTA/ATSC 2-tuner TV card in (1), running under Win7 WMC
Well, pretty amazing. Sure enough, the issue has disappeared!! On both machines!

No more auto-generated CAB files in C:\Windows\Temp, and essentially no files being created in C:\Windows\Logs\CBS as there were previously.

Whatever was the initial cause for the \CBS folder contents on both machines, deleting everything in that folder seems to have been the overall solution.

Looks like case closed. Thank you again for the tip.
 

My Computer My Computer

At a glance

Windows 7 Pro x64 (1), Win7 Pro X64 (2)i5-3350p 3.1Ghz/6MB-cache (1); E8400 3.0Ghz/6...8GB PC3-12800 DDR3 (1); 4GB PC3-10600 DDR3 (2)ATI HD7750 (1), (see TV cards); ATI R7 250 (2)
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home-built, two systems (1) and (2)
OS
Windows 7 Pro x64 (1), Win7 Pro X64 (2)
CPU
i5-3350p 3.1Ghz/6MB-cache (1); E8400 3.0Ghz/6MB-cache (2)
Motherboard
ASUS P8Z77-V Pro (1); ASUS P5Q3 (2)
Memory
8GB PC3-12800 DDR3 (1); 4GB PC3-10600 DDR3 (2)
Graphics Card(s)
ATI HD7750 (1), (see TV cards); ATI R7 250 (2)
Sound Card
Realtek ALC892 HD Audio (1); Realtek ALC1200 HD Audio (2)
Monitor(s) Displays
Eizo HD2441W LCD, Eizo S2433W (1); Eizo 24" S2433W (2)
Screen Resolution
1920x1200, 1920x1200 (1); 1920x1200 (2)
Hard Drives
(1) 1TB SATA-II (7200RPM), 2x2TB SATA-III (7200RPM), 250GB SATA-III (10000RPM) for OS; 2x2TB external USB 3.0

(2) 320GB SATA-II (7200RPM), 750GB SATA-II (7200RPM), 150GB SATA-II (10000RPM) for OS; 2TB external USB 3.0
PSU
Nesteq ECS-6001 600W (1); Nesteq ECS-5001 500W (2)
Case
Acousti-Case 360 (1) and (2)
Cooling
Noctua NH-U12P SE2 for CPU, 2x120mm case fans (1) and (2)
Keyboard
IBM PS/2 (1) and (2)
Mouse
Logitech MX Revolution wireless (1); Microsoft wired (2)
Internet Speed
100mbps down / 10mbps up
Antivirus
Microsoft Security Essentials; Malwarebyte Anti-Malware Pro
Browser
Firefox
Other Info
Ceton InfiniTV 4-tuner cablecard-enabled TV card as well as Hauppauge HVR-2250 OTA/ATSC 2-tuner TV card in (1), running under Win7 WMC
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