Insecure Transfer Via Curl.EXE

Severity: medium
Author: X__Junior (Nextron Systems)
Source: upstream

Detects execution of "curl.exe" with the "--insecure" flag.

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\curl.exe'
OriginalFileName: curl.exe

Stage 2: `all of selection_cli`

or:
CommandLine|contains: --insecure
CommandLine|re: '\s-k\s'

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	`--insecure`
`CommandLine`	regex_match	`\s-k\s`
`Image`	ends_with	`\curl.exe` corpus 19 (sigma 19)
`OriginalFileName`	eq	`curl.exe` corpus 11 (sigma 11)