T1114.001SubTechniquecollectionagent-callable

T1114.001Local Email Collection

Sub-technique of T1114

Platforms: Windows

ATT&CK version: 14.1

What it is

Adversaries may target user email on local systems to collect sensitive information. Files containing email data can be acquired from a user’s local system, such as Outlook storage or cache files. Outlook stores data locally in offline data files with an extension of .ost. Outlook 2010 and later supports .ost file sizes up to 50GB, while earlier versions of Outlook support up to 20GB.(Citation: Outlook File Sizes) IMAP accounts in Outlook 2013 (and earlier) and POP accounts use Outlook Data Files (.pst) as opposed to .ost, whereas IMAP accounts in Outlook 2016 (and later) use .ost files. Both types of Outlook data files are typically stored in `C:\Users\<username>\Documents\Outlook Files` or `C:\Users\<username>\AppData\Local\Microsoft\Outlook`.(Citation: Microsoft Outlook Files)

ATT&CK tactics· 1

Collection

References

  1. https://attack.mitre.org/techniques/T1114/001
  2. https://practical365.com/clients/office-365-proplus/outlook-cached-mode-ost-file-sizes/
  3. https://support.office.com/en-us/article/introduction-to-outlook-data-files-pst-and-ost-222eaf92-a995-45d9-bde2-f331f60e2790
Sourced from MITRE ATT&CK Enterprise v14.1. Curated and contextualized for EU compliance use cases by Adam Lundqvist, Founder at SQUR.