It’s a little more complicated than just copying data
Founded in 1991, Future Quest Technologies was created based on a fresh consumer need: on-site technology delivery. Future Quest Tech strove to be, and successfully became, a woman-owned trusted provider of Information Technology products, services and support. For 20+ yrs now, I've focused on financial crimes and digital investigations. My aim is to guide other FinCrime Investigators to be the best investigators they can be.
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Windows 10's built-in antivirus can now be used to download viruses
A recent update to Windows Defender gave it the ability to download files through a command line tool.
A recent update to the built-in antivirus software in Windows 10 has taught the program a new trick—how to download files through a command line tool, including nefarious ones (trojans, spyware, ransomware, and other malware).
Downloading malware is not the intended purpose, at least I presume that's not the case. But the new function could potentially be abused in such a manner. Fortunately, this is not something the typical home user needs to worry about, not unless they're a PC masochist (more on that in a moment).
This new ability was discovered by Mohammad Askar (via Bleeping Computer), a security penetration tester and instructor who has posted hundreds of security articles, according to his Udemy profile.
"Well, you can download a file from the internet using Windows Defender itself. In this example, I was able to download Cobalt Strike beacon using the binary 'MpCmdRun.exe' which is the 'Microsoft Malware Protection Command Line'," Askar stated on Twitter.
This effectively allows a local attacker to leverage Defender as what is called a living-off-the-land binary (LOLBin). That's when legitimate software is used for something malicious—in this case, using an antivirus program to download a virus.
It appears this new ability was added to Defender with the 4.18.2007.8 update in July, so the functionality has been there for nearly two months. Bleeping Computer tested the new download switch in the command line tool and was able to download the same WastedLocker ransomware that recently caused a ruckus with Garmin's infrastructure, which prompted the company to reportedly pay a multi-million dollar ransom.
This is not quite as careless as it may seem at first glance. For one, Defender will still scan files downloaded through this method, so in theory it should still protect against malware. And secondly, this would need to be initiated by a local user.
Nevertheless, this is something system administrators should be aware of, so they can take the proper precautions. It's not unheard of for a rogue employee to cause mischief, whether they are disgruntled, are on the verge of being fired, or any other reason.
Paul has been playing PC games and raking his knuckles on computer hardware since the Commodore 64. He does not have any tattoos, but thinks it would be cool to get one that reads LOAD"*",8,1. In his off time, he rides motorcycles and wrestles alligators (only one of those is true).
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How to Lock Your Windows 10 PC Using Command Prompt
MARSHALL GUNNELL @marshall_g08
SEPTEMBER 1, 2020, 10:24AM EDT
One of the first rules of cyber security is to always lock your PC before stepping away. While it may not be the quickest way to lock your Windows 10 PC, you can do it using the Command Prompt.
Lock Your Windows 10 PC Using Command Prompt
First, open the Command Prompt on your PC by opening the “Start” menu, typing “cmd” in the Windows Search bar, and then selecting “Command Prompt” from the search results.
Command Prompt will now open. Here, run this command to lock your Windows 10 PC.
Rundll32.exe user32.dll,LockWorkStation
Once executed, your PC will be locked. You’ll have to sign back in with your PIN, password, or whatever sign-in method you usually use.
Set the Lock Screen Timeout Setting Using Command Prompt
Once you’ve locked your PC, the lock screen will generally be displayed for a certain amount of time before it time outs. You can set the amount of time that needs to pass before timing out using the Command Prompt.
To do this, you’ll need to open Command Prompt as an admin. Do so by typing “cmd” in the Windows Search bar and then right-clicking “Command Prompt” from the results. Next, select “Run As Administrator” from the menu that appears.
With Command Prompt open, run this command.
powercfg.exe /SETACVALUEINDEX SCHEME_CURRENT SUB_VIDEO VIDEOCONLOCK <time>
Replace <time> with your desired amount of time in seconds. That means if you want to time out the lock screen after two minutes, you’d enter this command:
powercfg.exe /SETACVALUEINDEX SCHEME_CURRENT SUB_VIDEO VIDEOCONLOCK 120
Note: This command sets the lock screen timeout setting for your PC if it’s plugged up to a power source. To set the lock screen timeout setting for your PC if it’s running on battery, change/SETACVALUEINDEX to/SETDCVALUEINDEX and run the command as normal.
Next, run this command:
powercfg.exe /SETACTIVE SCHEME_CURRENT
Now your lock screen will timeout after the set amount of time. Give it a try!
MARSHALL GUNNELL
Marshall Gunnell is a writer with experience in the data storage industry. He worked at Synology, and most recently as CMO and technical staff writer at StorageReview. He's currently an API/Software Technical Writer at LINE Corporation in Tokyo, Japan. READ FULL BIO »
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