Email obfuscator ascii5/1/2023 single digit) pads a “0” before outputting the number. A RequestProcessor filter to automatically obfuscate all visible email addresses in all HTML output via the ContentController by replacing them with an encoded (switching between ASCII & hexadecimal) version. It converts the input string into an array of characters, cast into an array of integers, and pipes these into another ForEach-Object loop that subtracts the number 32 from each and if the result is less than 9 (i.e. Line 2 is a variant of what I created earlier. Also, I put the expression as $($_.Length-1) because if I don’t do that PowerShell expands $_ into a string and then tacks “.Length-1” to it as another string. And I get the length of the input text via $_.Length (this is why I put the whole block within a ForEach-Object loop as that’s the only way to make $_ variable available). Only point to note is I escape the $ symbols with a backtick ( `) so they don’t get interpreted as variables. These two lines are pretty straight-forward. Line 3 outputs the part of the final code that starts where the digits end (just after the right bracket) and goes all the way up to -replace " ". Line 1 outputs the part of the final code that starts with a and ends at the beginning of the series of digits (just before the left bracket). These techniques are in use by a large number of threat organizations, so their methods vary widely.(0. This plugin does use a more complex algorithm to obfuscate the email. Enable Multi-factor Authentication: MFA renders a username/password pair useless to an attacker. The hex string represents the following ASCII text: Base64, Version1.0.0.0, Cultureneutral, PublicKeyTokennull Sending a POST request with a Base64 encoded IP and port will open a second socket to the supplied IP and port making this a Web proxy. I see the webpage code it simply substitutes the ASCII characters of the email.You should never actually know your own password. Most are free and none can be fooled into entering a password into a malicious site, no matter how seemingly authentic. Use a Password Manager: The best defense against most credential harvesting attacks is the use of a password manager.The techniques are typical of email obfuscation–many of them old–so there is no direct link between a threat actor and their methodology. Multiple Actors: Page obfuscation is now in use by multiple actors. And it can be easily reversed by a human or a specialized tool and original data can be recovered. Even simple techniques are successful today, but as these are eventually caught, more advanced methods will continue to remain effective. The solution: Obfuscate Currently, spambots are not capable of reading email addresses that are translated from ASCII to their UNICODE equivalents. Multiple Vulnerabilities: While categorized as a single method, attackers are using a variety of obfuscation techniques, so that there is no single vulnerability to close.Concealed Page Intent: Microsoft URL filters are unable to determine the intent of an obfuscated page, so a malicious email is allowed to reach the user inbox.Why are SiteCloak Obfuscation Techniques Effective? Result: If the user is not vigilant and provides their credentials, the user account is compromised.Payload: In most cases, the target page is a credential harvesting site, but because these techniques are now in widespread use by a number of organizations, they are independent of the purpose of the page.Most are capable of fooling Microsoft's scanners. This behavior is widespread, using a variety of methods of varying levels of sophistication from multiple threat actors. Email Attack: Attackers are hiding the intent of the target page using a variety of obfuscation techniques.Background: In order to identify a malicious URL within an email, Microsoft will follow a link to scan the target page for potential malware or phishing behavior.Technique: Obfuscation of Credential Harvesting Page What is a SiteCloak Attack? Quick Summary of Obfuscation Attack TargetĮmail Security: Exchange Online Protection and Advanced Threat Protection This behavior is widespread, using a variety of techniques from multiple threat actors. It is a tool useful for anyone creating and editing web pages. These SiteCloak methods bypass Microsoft’s real-time URL-filtering scanners by obfuscating the credential-harvesting page. Email Obfuscator creates email links using ‘obfuscated’ code ready to be used in your html web pages. We are seeing a rise in the number of phishing attacks that bypass Office 365 due to the attackers’ use of obfuscation techniques on the credential harvesting website.
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