Arbitrary File Download Via GfxDownloadWrapper.EXE

Severity: medium
Author: Victor Sergeev, oscd.community
Source: upstream

Detects execution of GfxDownloadWrapper.exe with a URL as an argument to download file.

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1105` Ingress Tool Transfer

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`

or:
CommandLine|contains: 'http://'
CommandLine|contains: 'https://'
Image|endswith: '\GfxDownloadWrapper.exe'

Stage 2: `not 1 of filter_main_known_urls`

CommandLine|contains: 'https://gameplayapi.intel.com/'

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	`http://` corpus 15 (sigma 15) `https://` corpus 14 (sigma 14) `https://gameplayapi.intel.com/`
`Image`	ends_with	`\GfxDownloadWrapper.exe`