Is there a way to see what is accessing the net?

We've got a computer that seems to be downloading something even when no programs that would access the net are active.

We've run a scan with AVG and found no viruses, but when I open the Local Area Connection Status, the Received data number keeps rising as if something were being downloaded.

Is there a way to see what is being downloaded or what is connected to the computer? I tried running netstat but it didn't show anything.

The computer is running XP Pro.

What firewall are you running?

Nothing beyond the Windows firewall and what is built into the router (a Netgear WGR614 v4).

Could be malware but also could be downloading latest updates. Odd that netstat /a doesn't show anything though. I'd err on the side of caution and do the following... (edited /all to /a)

Print these instructions out.

NOTE. If any of the programs listed below refuse to run, try renaming executive file to something else; for instance, rename hijackthis.exe to scanner4.exe

1. Download SUPERAntiSpyware Free for Home Users:
http://www.superantispyware.com/

* Double-click SUPERAntiSpyware.exe and use the default settings for installation.
* An icon will be created on your desktop. Double-click that icon to launch the program.
* If asked to update the program definitions, click "Yes". If not, update the definitions before scanning by selecting "Check for Updates". (If you encounter any problems while downloading the updates, manually download and unzip them from here: http://www.superantispyware.com/definitions.html.)
* Close SUPERAntiSpyware.

PHYSICALLY DISCONNECT FROM THE INTERNET

Restart computer in Safe Mode.
To enter Safe Mode, restart computer, and keep tapping F8 key, until menu appears; select Safe Mode; you'll see "Safe Mode" in all four corners of your screen

* Open SUPERAntiSpyware.
* Under Configuration and Preferences, click the Preferences button.
* Under [b]General and Startup" tab, make sure, Start SUPERAntiSpyware when Windows starts option is UN-checked.
* Click the Scanning Control tab.
* Under Scanner Options make sure the following are checked (leave all others unchecked):
- Close browsers before scanning.
- Scan for tracking cookies.
- Terminate memory threats before quarantining.
* Click the Close button to leave the control center screen.
* Back on the main screen, under Scan for Harmful Software click Scan your computer.
* On the left, make sure you check C:\Fixed Drive.
* On the right, under Complete Scan, choose Perform Complete Scan.
* Click Next to start the scan. Please be patient while it scans your computer.
* After the scan is complete, a Scan Summary box will appear with potentially harmful items that were detected. Click OK.
* Make sure everything has a checkmark next to it and click Next.
* A notification will appear that Quarantine and Removal is Complete. Click OK and then click the Finish button to return to the main menu.
* If asked if you want to reboot, click Yes.
* To retrieve the removal information after reboot, launch SUPERAntispyware again.
- Click Preferences, then click the Statistics/Logs tab.
- Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
- If there are several logs, click the current dated log and press View log. A text file will open in your default text editor.
- Please copy and paste the Scan Log results in your next reply.
* Click Close to exit the program.
Post SUPERAntiSpyware log.
NOTE: Tracking cookies can be omitted from the log.

RECONNECT TO THE INTERNET

RESTART COMPUTER!

2. Download Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php to your desktop.
(Malwarebytes is free to use as a manual scanner. Payment is only required if you wish to have it run and update automatically which is not necessary for our purposes)

* Double-click mbam-setup.exe and follow the prompts to install the program.
* At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
* If an update is found, it will download and install the latest version.
* Once the program has loaded, select Perform full scan, then click Scan.
* When the scan is complete, click OK, then Show Results to view the results.
* Be sure that everything is checked, and click Remove Selected.
* When completed, a log will open in Notepad.
* Post the log back here.

The log can also be found here:
C:\Documents and Settings\Username\Application Data\Malwarebytes\Malwarebytes' Anti-Malware\Logs\log-date.txt
Or at C:\Program Files\Malwarebytes' Anti-Malware\Logs\log-date.txt

RESTART COMPUTER!

3. Download gmer.zip: http://www.gmer.net/files.php
Unzip the file, and double click on gmer.exe, select Rootkit tab and click the Scan button.
When scan is completed, click Save button, and save the results as gmer.log
Warning ! Please, do not select the "Show all" checkbox during the scan.
Post the log to your next reply.

RESTART COMPUTER

4. Download, install, and run HijackThis:
http://www.snapfiles.com/get/hijackthis.html
Post HijackThis log.
Do NOT attempt to "fix" anything yet with Hijackthis!


DO NOT make any other changes to your computer (like installing programs, using other cleaning tools, etc.), until it's officially declared clean!!!

Above layout courtesy of Broni

Netstat -ab

-a Displays all connections and listening ports.
-b Displays the executable involved in creating each connection or
listening port. In some cases well-known executables host
multiple independent components, and in these cases the
sequence of components involved in creating the connection
or listening port is displayed. In this case the executable
name is in [] at the bottom, on top is the component it called,
and so forth until TCP/IP was reached. Note that this option
can be time-consuming and will fail unless you have sufficient
permissions.
-e Displays Ethernet statistics. This may be combined with the -s
option.
-n Displays addresses and port numbers in numerical form.
-o Displays the owning process ID associated with each connection.
-p proto Shows connections for the protocol specified by proto; proto
may be any of: TCP, UDP, TCPv6, or UDPv6. If used with the -s
option to display per-protocol statistics, proto may be any of:
IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, or UDPv6.
-r Displays the routing table.
-s Displays per-protocol statistics. By default, statistics are
shown for IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, and UDPv6;
the -p option may be used to specify a subset of the default.
-v When used in conjunction with -b, will display sequence of
components involved in creating the connection or listening
port for all executables.
interval Redisplays selected statistics, pausing interval seconds
between each display. Press CTRL+C to stop redisplaying
statistics. If omitted, netstat will print the current
configuration information once.

If the netstat command doesn't show anything, it is likely malware. Other network monitoring tools are likely disabled also. Use fink's method for detecting and removing them. A firewall like Comodo or Zone Alarm might show which program is accessing the network, and allow blocking it, but that won't really solve the problem.

Ah, forgot about the - commands with netstat.

We ran it with -ab and a number of items came up. Most were svchost.exe or lsass.exe, AVG and Active Sync. Didn't really see anything unusual.

Windows updates are not being downloaded, so we'll try the other suggestions.

Thanks.

Couldn't boot into safe mode because the computer blue-screens every time.

Then run it in normal mode for now.