Outlook Attachments

Attackers can compose an email on Outlook (or O365) and attach a file and then use the file's download link to directly download the file. Restricted file types would first need to have their file extension modified (e.g. mimikatz.exe becomes mimikatz.exe.txt) and then upon download the file extension is modified back to the original extension.

1. Compose an email
2. Attach a file (add .txt to the end if it's a restricted file type)
3. Click on the file to download it and grab the link (attachment.outlook.live.net or attachment.office.net)

Link is valid for ~15 minutes.

#outlook #attachments #redteam #phishing

KnockOutlook

KnockOutlook is a C# project that interacts with Outlook's COM object in order to perform a number of operations useful in red team engagements.

https://github.com/eksperience/KnockOutlook

#exchange #outlook #com #recon