Potential CCleanerDU.DLL Sideloading

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

Detects potential DLL sideloading of "CCleanerDU.dll"

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: '\CCleanerDU.dll'

Stage 2: `not 1 of filter_main_path`

or:
Image|endswith: '\CCleaner.exe'
Image|endswith: '\CCleaner64.exe'
or:
Image|startswith: 'C:\Program Files (x86)\CCleaner\'
Image|startswith: 'C:\Program Files\CCleaner\'

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	`\CCleaner.exe` `\CCleaner64.exe`
`Image`	starts_with	`C:\Program Files (x86)\CCleaner\` corpus 2 (sigma 2) `C:\Program Files\CCleaner\` corpus 2 (sigma 2)
`ImageLoaded`	ends_with	`\CCleanerDU.dll`