Archive for November, 2017

In the event that your Windows machine has been compromised or for any other reason, this Penetration Testing Cheat Sheet is intended to help.

This Penetration Testing Cheat Sheet article is for Windows Administrators and security personnel to better execute a thorough examination of their framework (inside and out) keeping in mind the end goal is to search for indications of compromise.

Apart From this You can Read Many Penetration testing Articles Here .

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1.Unusual Log Entries:

Check your logs for suspicious events, such as:

  • “Event log service was stopped.”
  • “Windows File Protection is not active on this system.”
  • “The protected System file [file name] was not restored to its original, valid version because of the Windows File Protection…”
  • “The MS Telnet Service has started successfully.”
  • Look for a large number of failed logon attempts or locked out accounts.

Penetration Testing Cheat Sheet To do this using the GUI, run the Windows event viewer:

C:> eventvwr.msc

Using the command prompt:

C:> eventquery.vbs | more

Or, to focus on a particular event log:

C:> eventquery.vbs /L security

Also Read:   Google : Microsoft is putting Windows 7 and 8.1 users in danger By only patching Windows 10

2.Unusual Processes and Services:

Look for unusual/unexpected processes, and focus on processes with User Name “SYSTEM” or “Administrator” (or users in the Administrators’ group). You need to be familiar with normal processes and services and search for deviations.

Using the GUI, run Task Manager:

C:> taskmgr.exe

Using the command prompt:

C:> tasklist
C:> wmic process list full

Also look for unusual services.

Using the GUI:
C:> services.msc

Using the command prompt:

C:> net start
C:> sc query

For a list of services associated with each process:

C:> tasklist /svc

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3.Unusual Files and Registry Keys

Check file space usage to look for sudden major decreases in free space, using the GUI (right-click on a partition), or type:

C:> dir c:

Look for unusually big files:

Start–> Search–>For Files of Folders… Search Options–>Size–>At Least 10000KB

Look for strange programs referred to in registry keys associated with system start up:

HKLMSoftwareMicrosoftWindowsCurrentVersionRun

HKLMSoftwareMicrosoftWindowsCurrentVersionRunonce 

HKLMSoftwareMicrosoftWindowsCurrentVersionRunonceEx

Note that you should also check the HKCU counterparts (replace HKLM with HKCU above).
Using the GUI:

C:> regedit

Using the command prompt:

C:> reg query <reg key>

4.Penetration Testing Cheat Sheet for Unusual Network Usage

Look at file shares, and make sure each has a defined business purpose:

C:> net view \127.0.0.1

Look at who has an open session with the machine:

C:> net session

Look at which sessions this machine has opened with other systems:

C:> net use

Look at NetBIOS over TCP/IP activity:

C:> nbtstat –S

Look for unusual listening TCP and UDP ports:

C:> netstat –na

For continuously updated and scrolling output of this command every 5 seconds:

C:> netstat –na 5

The –o flag shows the owning process id:

C:> netstat –nao 5

The –b flag shows the executable name and the DLLs loaded for the network connection.

C:> netstat –naob 5

Note that the –b flag uses excessive CPU resources.
Again, you need to understand normal port usage for the system and look for deviations.

Also, check Windows Firewall configuration:

C:> netsh firewall show config

5.Unusual Scheduled Tasks

Look for unusually scheduled tasks, especially those that run as a user in the Administrators group, as SYSTEM, or with a blank user name.

Using the GUI, run Task Scheduler:

Start–>Programs–>Accessories–>System Tools–>Scheduled Tasks

Using the command prompt:

C:> schtasks

Check other autostart items as well for unexpected entries, remembering to check user autostart directories and registry keys.

Using the GUI, run msconfig and look at the Startup tab:

Start –> Run, msconfig.exe

Using the command prompt:

C:> wmic startup list full

6.Unusual Accounts

Look for new, unexpected accounts in the Administrators group:

C:> lusrmgr.msc

Click on Groups, Double Click on Administrators, then check members of this group.
This can also be done at the command prompt:

C:> net user
C:> net localgroup administrators

7.Other Unusual Items

Look for unusually sluggish performance and a single unusual process hogging the CPU:

Task Manager –> Process and Performance tabs

Look for unusual system crashes, beyond the normal level for the given system.

On a periodic basis (daily, weekly, or each time you logon to a system you manage,) run through these quick steps to look for anomalous behavior that might be caused by a computer intrusion. Each of these commands runs locally on a system.

 

 

The article originally appeared on:

facebook-link-spoofing

While scrolling on Facebook how you decide which link/article should be clicked or opened?

Facebook timeline and Messenger display title, description, thumbnail image and URL of every shared-link, and this information are enough to decide if the content is of your interest or not.

Since Facebook is full of spam, clickbait and fake news articles these days, most users do not click every second link served to them.

But yes, the possibility of opening an article is much higher when the content of your interest comes from a legitimate and authoritative website, like YouTube or Instagram.

However, what if a link shared from a legitimate website lands you into trouble?

Even before links shared on Facebook could not be edited, but to stop the spread of misinformation and false news, the social media giant also removed the ability for Pages to edit title, description, thumbnail image of a link in July 2017.However, it turns out that—spammers can spoof URLs of the shared-links to trick users into visiting pages they do not expect, redirecting them to phishing or fake news websites with malware or malicious content.

Discovered by 24-year-old security researcher Barak Tawily, a simple trick could allow anyone to spoof URLs by exploiting the way Facebook fetch link previews.

In brief, Facebook scans shared-link for Open Graph meta tags to determine page properties, specifically ‘og:url’, ‘og:image’ and ‘og:title’ to fetch its URL, thumbnail image and title respectively.

facebook security

Interestingly, Tawily found that Facebook does not validate if the link mentioned in ‘og:url’ meta tag is same as the page URL, allowing spammers to spread malicious web pages on Facebook with spoofed URLs by just adding legitimate URLs in ‘og:url’ Open Graph meta tag on their websites.

“In my opinion, all Facebook users think that preview data shown by Facebook is reliable, and will click the links they are interested in, which makes them easily targeted by attackers that abuse this feature in order to perform several types of attacks, including phishing campaigns/ads/click fraud pay-per-click,” Tawily told The Hacker News.

Tawily reported the issue to Facebook, but the social media giant refused to recognise it as a security flaw and referred that Facebook uses “Linkshim” to protect against such attacks.

If you are unaware, every time a link is clicked on Facebook, a system called “Linkshim” checks that URL against the company’s own blacklist of malicious links to avoid phishing and malicious websites.This means if an attacker is using a new domain for generating spoofed links, it would not be easy for Linkshim system to identify if it is malicious.

Although Linkshim also uses machine learning to identify never-seen-before malicious pages by scanning its content, Tawily found that the protection mechanism could be bypassed by serving non-malicious content explicitly to Facebook bot based on User-Agent or IP address.

Tawily has also provided a demo video to show the attack in action. You can watch the video above.

Since there is no way to check the actual URL behind a shared link on Facebook without opening it, there is a little user can do to protect themselves except being vigilant.

Article appeared on:

Project taken from:

https://www.hackster.io/shiva-siddharth/simultaneously-run-alexa-and-google-assistant-on-pi-12e8df