Potential Goopdate.DLL Sideloading

Severity: medium
Author: X__Junior (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects potential DLL sideloading of "goopdate.dll", a DLL used by googleupdate.exe

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1574.001` Hijack Execution Flow: DLL
Privilege Escalation	`T1574.001` Hijack Execution Flow: DLL
Defense Evasion	`T1574.001` Hijack Execution Flow: DLL

Event coverage

Provider	Event ID	Title
Sysmon	7	Image loaded

Stages and Predicates

Stage 1: `selection`

ImageLoaded|endswith: '\goopdate.dll'

Stage 2: `not 1 of filter_main_generic`

or:
ImageLoaded|startswith: 'C:\Program Files (x86)\'
ImageLoaded|startswith: 'C:\Program Files\'

Stage 3: `not 1 of filter_optional_*`

or:
or:
Image|contains: ':\Windows\SystemTemp\GUM'
Image|contains: '\AppData\Local\Temp\GUM'
or:
ImageLoaded|contains: ':\Windows\SystemTemp\GUM'
ImageLoaded|contains: '\AppData\Local\Temp\GUM'
Image|endswith: '.tmp\GoogleUpdate.exe'
Image|contains: '.tmp\Dropbox'
Image|contains: '\AppData\Local\Temp\GUM'
ImageLoaded|contains: '.tmp\goopdate.dll'
ImageLoaded|contains: '\AppData\Local\Temp\GUM'

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
`Image`	ends_with	`.tmp\GoogleUpdate.exe`
`Image`	match	`.tmp\Dropbox` `:\Windows\SystemTemp\GUM` `\AppData\Local\Temp\GUM`
`ImageLoaded`	ends_with	`\goopdate.dll`
`ImageLoaded`	match	`.tmp\goopdate.dll` `:\Windows\SystemTemp\GUM` `\AppData\Local\Temp\GUM`
`ImageLoaded`	starts_with	`C:\Program Files (x86)\` corpus 6 (sigma 6) `C:\Program Files\` corpus 6 (sigma 6)