PUA - NPS Tunneling Tool Execution

Severity: high
Author: Florian Roth (Nextron Systems)
Source: upstream

Detects the use of NPS, a port forwarding and intranet penetration proxy server

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1090` Proxy

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `1 of selection_img`

Image|endswith: '\npc.exe'

Stage 2: `1 of selection_cli_1`

CommandLine|contains: ' -password='
CommandLine|contains: ' -server='
CommandLine|contains: ' -vkey='

Stage 3: `1 of selection_cli_2`

CommandLine|contains: ' -config=npc'

Stage 4: `1 of selection_hashes`

or:
Hashes|contains: 'MD5=AE8ACF66BFE3A44148964048B826D005'
Hashes|contains: 'SHA1=CEA49E9B9B67F3A13AD0BE1C2655293EA3C18181'
Hashes|contains: 'SHA256=5A456283392FFCEEEACA3D3426C306EB470304637520D72FED1CC1FEBBBD6856'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`CommandLine`	match	`-config=npc` `-password=` `-server=` `-vkey=`
`Hashes`	match	`MD5=AE8ACF66BFE3A44148964048B826D005` `SHA1=CEA49E9B9B67F3A13AD0BE1C2655293EA3C18181` `SHA256=5A456283392FFCEEEACA3D3426C306EB470304637520D72FED1CC1FEBBBD6856`
`Image`	ends_with	`\npc.exe`

PUA - NPS Tunneling Tool Execution

MITRE ATT&CK coverage

Event coverage

Stages and Predicates

Stage 1: 1 of selection_img

Stage 2: 1 of selection_cli_1

Stage 3: 1 of selection_cli_2

Stage 4: 1 of selection_hashes

Indicators

Stage 1: `1 of selection_img`

Stage 2: `1 of selection_cli_1`

Stage 3: `1 of selection_cli_2`

Stage 4: `1 of selection_hashes`