Abusable DLL Potential Sideloading From Suspicious Location

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

Detects potential DLL sideloading of DLLs that are known to be abused from suspicious locations

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059` Command and Scripting Interpreter

Event coverage

Provider	Event ID	Title
Sysmon	7	Image loaded

Stages and Predicates

Stage 1: `selection_dll`

or:
ImageLoaded|endswith: '\HPCustPartUI.dll'
ImageLoaded|endswith: '\ZIPDLL.dll'
ImageLoaded|endswith: '\coreclr.dll'
ImageLoaded|endswith: '\facesdk.dll'
ImageLoaded|endswith: '\libcef.dll'

Stage 2: `1 of selection_folders_1`

or:
ImageLoaded|contains: ':\Perflogs\'
ImageLoaded|contains: ':\Users\Public\'
ImageLoaded|contains: '\Temporary Internet'
ImageLoaded|contains: '\Windows\Temp\'

Stage 3: `1 of selection_folders_2`

or:
ImageLoaded|contains: ':\Users\'
ImageLoaded|contains: '\Contacts\'
ImageLoaded|contains: ':\Users\'
ImageLoaded|contains: '\Favorites\'
ImageLoaded|contains: ':\Users\'
ImageLoaded|contains: '\Favourites\'
ImageLoaded|contains: ':\Users\'
ImageLoaded|contains: '\Pictures\'

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
`ImageLoaded`	ends_with	`\HPCustPartUI.dll` `\ZIPDLL.dll` `\coreclr.dll` `\facesdk.dll` `\libcef.dll`
`ImageLoaded`	match	`:\Perflogs\` corpus 2 (sigma 2) `:\Users\` corpus 2 (sigma 2) `:\Users\Public\` corpus 2 (sigma 2) `\Contacts\` corpus 2 (sigma 2) `\Favorites\` corpus 2 (sigma 2) `\Favourites\` corpus 2 (sigma 2) `\Pictures\` corpus 2 (sigma 2) `\Temporary Internet` corpus 2 (sigma 2) `\Windows\Temp\` corpus 2 (sigma 2)