Msmailprobe - Office 365 And Exchange Enumeration

Office 365 and Exchange EnumerationIt is widely known that OWA (Outlook Webapp) is vulnerable to time-based user enumeration attacks. This tool leverages all known, and even some lesser-known services exposed by default Exchange installations to enumerate users. It also targets Office 365 for error-based user enumeration.Getting StartedIf you want to download and compile the simple, non-dependant code, you must first install GoLang! I will let the incredible documentation, and other online resources help you with this task.https://golang.org/doc/installYou may also download the compiled release here.SyntaxList examples of commands for this applications, but simply running the binary with the examples command:./msmailprobe examplesYou can also get more specific help by running the binary with the arguments you are interested in:./msmailprobe identify./msmailprobe userenum./msmailprobe userenum --onprem./msmailprobe userenum --o365UsageIdentify CommandUsed for gathering information about a host that may be pointed towards an Exchange or o365 tied domainQueries for specific DNS records related to Office 365 integrationAttempts to extract internal domain name for onprem instance of ExchangeIdentifies services vulnerable to time-based user enumeration for onprem ExchangeLists password-sprayable services exposed for onprem Exchange hostFlag to use: -t to specify target hostExample: ./msmailprobe identify -t mail.target.comUserenum (o365) CommandError-based user enumeration for Office 365 integrated email addressesFlags to use: -E for email list OR -e for single email address -o optionalto specify an out file for valid emails identified --threads optional for setting amount of requests to be made concurrentlyExamples: ./msmailprobe userenum --o365 -E emailList.txt -o validemails.txt --threads 25 ./msmailprobe userenum --o365 -e admin@target.comUserenum (onprem) CommandTime-based user enumeration against multiple onprem Exchange servicesFlags to use: -t to specify target host -U for user list OR -u for single username -o optionalto specify an out file for valid users identified --threads optional for setting amount of requests to be made concurrentlyExamples: ./msmailprobe userenum --onprem -t mail.target.com -U userList.txt -o validusers.txt --threads 25 ./msmailprobe userenum --onprem -t mail.target.com -u adminAcknowledgmentspoptart - For a truck load of golang assistance, poking of Exchange services, and help testing timing of responsesjlarose - Parsing decimal data within NTLMSSP authentication reponse for internal domain nameVincent Yui - Office 365 check python scriptgrimhacker - Discovery/disclosure of error-based user enumeration within Office 365 blog postNate Power - Discovery and disclosure of OWA time-based user enumerationLicenseThis project is licensed under the MIT License - see the LICENSE.md file for detailsDownload Msmailprobe
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