LOLBAS/yml/OtherMSBinaries/Teams.yml

---
Name: Teams.exe
Description: Electron runtime binary which runs the Teams application
Author: Andrew Kisliakov
Created: 2022-01-17
Commands:
  - Command: teams.exe
    Description: Generate JavaScript payload and package.json, and save to "%LOCALAPPDATA%\\Microsoft\\Teams\\current\\app\\" before executing.
    Usecase: Execute JavaScript code
    Category: Execute
    Privileges: User
    MitreID: T1218
    OperatingSystem: Windows 10, Windows 11
  - Command: teams.exe
    Description: Generate JavaScript payload and package.json, archive in ASAR file and save to "%LOCALAPPDATA%\\Microsoft\\Teams\\current\\app.asar" before executing.
    Usecase: Execute JavaScript code
    Category: Execute
    Privileges: User
    MitreID: T1218
    OperatingSystem: Windows 10, Windows 11
  - Command: teams.exe --disable-gpu-sandbox --gpu-launcher="C:\Windows\system32\cmd.exe /c ping google.com &&"
    Description: Teams spawns cmd.exe as a child process of teams.exe and executes the ping command
    Usecase: Executes a process under a trusted Microsoft signed binary
    Category: Execute
    Privileges: User
    MitreID: T1218
    OperatingSystem: Windows 10, Windows 11
Full_Path:
  - Path: "%LOCALAPPDATA%\\Microsoft\\Teams\\current\\Teams.exe"
Code_Sample:
  - Code: https://github.com/lltltk/LOLBAS-research/tree/master/Teams
Detection:
  - IOC: "%LOCALAPPDATA%\\Microsoft\\Teams\\current\\app directory created"
  - IOC: "%LOCALAPPDATA%\\Microsoft\\Teams\\current\\app.asar file created/modified by non-Teams installer/updater"
  - Sigma: https://github.com/SigmaHQ/sigma/blob/43277f26fc1c81fc98fc79147b711189e901b757/rules/windows/process_creation/proc_creation_win_susp_electron_exeuction_proxy.yml
Resources:
  - Link: https://l--k.uk/2022/01/16/microsoft-teams-and-other-electron-apps-as-lolbins/
Acknowledgement:
  - Person: Andrew Kisliakov
  - Person: mr.d0x
    Handle: '@mrd0x'