PUA - Chisel Tunneling Tool Execution

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

Detects usage of the Chisel tunneling tool via the commandline arguments

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1090.001` Proxy: Internal Proxy

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `selection_img`

Image|endswith: '\chisel.exe'

Stage 2: `all of selection_param1`

or:
CommandLine|contains: 'exe client '
CommandLine|contains: 'exe server '

Stage 3: `all of selection_param2`

or:
CommandLine|contains: ' r:'
CommandLine|contains: -reverse
CommandLine|contains: -socks5
CommandLine|contains: '-tls-skip-verify '
CommandLine|contains: ':127.0.0.1:'
CommandLine|contains: ':socks'

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	`r:` `-reverse` `-socks5` `-tls-skip-verify` `:127.0.0.1:` `:socks` `exe client` `exe server`
`Image`	ends_with	`\chisel.exe`