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What does it mean if a file is signed with a broken digital signature?

#1
I scanned my computer with AVG (Which just recently has been acting funny), and I found and deleted a bunch of tracking cookies, but there were a hand full of files that I don't think were infected, but it said next to them that "The file is signed with a broken digital signature" Does anyone know what that means, and how to fix it?
Thanks! O h and most of those files were from C:\WINDOWS\Installer
 

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richc46

Staff member
Vista Guru
Gold Member
#2
Per AVG this is for information only
The file is signed with a broken digital signature
The reported file was signed with a digital certificate ensuring its integrity. However due to changes to it, the certificate no longer corresponds with the content. This might happen when file is infected but also when it was incorrectly updated, broken due to some error or when the digital signature expired.


Make sure that you run a full, updated AVG scan
Download and run malwarebytes; full and upated scan
If all is negative, you are ok.
http://www.malwarebytes.org/mbam.php
 

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System One

  • Manufacturer/Model
    Dell XPS420
    Memory
    6 gig
    Graphics Card(s)
    ATI Radeon HD3650 256 MB
    Sound Card
    Intergrated 7.1 Channel Audio
    Monitor(s) Displays
    Dell SP2009W 20 inch Flat Panel w Webcam
    Hard Drives
    640 gb
    Cooling
    Fan
    Mouse
    Dell USB 4 button optical
    Keyboard
    Dell USB
    Other Info
    DSL provided by ATT

richc46

Staff member
Vista Guru
Gold Member
#4
Actually I do. Most times it is a problem with AVG 9.0
go back to 8.5
or
Unistall and use Microsoft Security Essentials. Which is made just for Windows
I use MSE, Malwarebytes and the Windows Firewall.
 

My Computer

System One

  • Manufacturer/Model
    Dell XPS420
    Memory
    6 gig
    Graphics Card(s)
    ATI Radeon HD3650 256 MB
    Sound Card
    Intergrated 7.1 Channel Audio
    Monitor(s) Displays
    Dell SP2009W 20 inch Flat Panel w Webcam
    Hard Drives
    640 gb
    Cooling
    Fan
    Mouse
    Dell USB 4 button optical
    Keyboard
    Dell USB
    Other Info
    DSL provided by ATT
#5
I updated AVG about a week or so ago, and ever since then, when I scan something when it counts the files that it scans, it jumps like from 2 hundred something, all the way into the 7 or 8 thousands. so last night I uninstalled it and re downloaded it and reinstalled it, and the problem was still there. so I used the system restore on my computer, and restored it to about 2 months ago, and then it wouldn't let me uninstall AVG, so I had to undo the system restore, and ever since then I scanned twice and both times I had a hand full of files in C:\WINDOWS\Installer that were signed with a broken digital signature.
 

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richc46

Staff member
Vista Guru
Gold Member
#6
Make a system restore point
Then uninstall
and then
try Microsoft Security Essentials
Cant uninstall
Use the AVG unistall tool
and
Try revno uninstaller
and/or
try in safe mode
 

My Computer

System One

  • Manufacturer/Model
    Dell XPS420
    Memory
    6 gig
    Graphics Card(s)
    ATI Radeon HD3650 256 MB
    Sound Card
    Intergrated 7.1 Channel Audio
    Monitor(s) Displays
    Dell SP2009W 20 inch Flat Panel w Webcam
    Hard Drives
    640 gb
    Cooling
    Fan
    Mouse
    Dell USB 4 button optical
    Keyboard
    Dell USB
    Other Info
    DSL provided by ATT

richc46

Staff member
Vista Guru
Gold Member
#8
You are very welcome
 

My Computer

System One

  • Manufacturer/Model
    Dell XPS420
    Memory
    6 gig
    Graphics Card(s)
    ATI Radeon HD3650 256 MB
    Sound Card
    Intergrated 7.1 Channel Audio
    Monitor(s) Displays
    Dell SP2009W 20 inch Flat Panel w Webcam
    Hard Drives
    640 gb
    Cooling
    Fan
    Mouse
    Dell USB 4 button optical
    Keyboard
    Dell USB
    Other Info
    DSL provided by ATT
#9
You say that you have a handful. The C:\Windows\Installer folder is quite delicate. If you can, would you mind uploading the log? It will look like it means nothing, as they are likely to be CLSIDs (long strings of random numbers) but we may actually be able to make sense of them. Suppose that they all originate from one program. Re-install that one program?
 

My Computer

System One

  • Manufacturer/Model
    Dell XPS 420
    CPU
    Intel Core 2 Quad Q9300 2.50GHz
    Motherboard
    Stock Dell 0TP406
    Memory
    4 gb (DDR2 800) 400MHz
    Graphics Card(s)
    ATI Radeon HD 3870 (512 MBytes)
    Sound Card
    Onboard
    Monitor(s) Displays
    1 x Dell 2007FP and 1 x (old) Sonic flat screen
    Screen Resolution
    1600 x 1200 and 1280 x 1204
    Hard Drives
    1 x 640Gb (SATA 300)
    Western Digital: WDC WD6400AAKS-75A7B0

    1 x 1Tb (SATA 600)
    Western Digital: Caviar Black, SATA 6GB/S, 64Mb cache, 8ms
    Western Digital: WDC WD1002FAEX-00Z3A0 ATA Device
    PSU
    Stock PSU - 375W
    Case
    Dell XPS 420
    Cooling
    Stock Fan
    Mouse
    Advent Optical ADE-WG01 (colour change light up)
    Keyboard
    Dell Bluetooth
    Internet Speed
    120 kb/s
    Other Info
    ASUS USB 3.0 5Gbps/SATA 6Gbps - PCI-Express Combo Controller Card (U3S6)
#10
You say that you have a handful. The C:\Windows\Installer folder is quite delicate. If you can, would you mind uploading the log? It will look like it means nothing, as they are likely to be CLSIDs (long strings of random numbers) but we may actually be able to make sense of them. Suppose that they all originate from one program. Re-install that one program?
Well I uninstalled AVG so I don't have the log anymore, but maybe you can tell me why when AVG was scanning my computer, as it was counting the objects is scanned it jumped from like 2 or 3 hundred all the way to like 7000. I think it only started doing that when I updated to 9.0. I was just wondering if that was something with AVG 9.0 or with my computer. I'm going to try going back to 8.5 when I get a chance. been very busy lately.
 

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