Suspicious File Created Via OneNote Application

Severity: high
Author: Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects suspicious files created via the OneNote application. This could indicate a potential malicious ".one"/".onepkg" file was executed as seen being used in malware activity in the wild

Event coverage

Provider	Event ID	Title
Sysmon	11	FileCreate

Stages and Predicates

Stage 1: `selection`

or:
Image|endswith: '\onenote.exe'
Image|endswith: '\onenoteim.exe'
Image|endswith: '\onenotem.exe'
or:
TargetFilename|endswith: .bat
TargetFilename|endswith: .chm
TargetFilename|endswith: .cmd
TargetFilename|endswith: .dll
TargetFilename|endswith: .exe
TargetFilename|endswith: .hta
TargetFilename|endswith: .htm
TargetFilename|endswith: .html
TargetFilename|endswith: .js
TargetFilename|endswith: .lnk
TargetFilename|endswith: .ps1
TargetFilename|endswith: .vbe
TargetFilename|endswith: .vbs
TargetFilename|endswith: .wsf
TargetFilename|contains: '\AppData\Local\Temp\OneNote\'

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	`\onenote.exe` corpus 6 (sigma 6) `\onenoteim.exe` corpus 6 (sigma 6) `\onenotem.exe`
`TargetFilename`	ends_with	`.bat` corpus 15 (sigma 15) `.chm` corpus 3 (sigma 3) `.cmd` corpus 8 (sigma 8) `.dll` corpus 21 (sigma 21) `.exe` corpus 18 (sigma 18) `.hta` corpus 12 (sigma 12) `.htm` `.html` `.js` corpus 8 (sigma 8) `.lnk` corpus 5 (sigma 5) `.ps1` corpus 15 (sigma 15) `.vbe` corpus 13 (sigma 13) `.vbs` corpus 16 (sigma 16) `.wsf` corpus 6 (sigma 6)
`TargetFilename`	match	`\AppData\Local\Temp\OneNote\`

Suspicious File Created Via OneNote Application

Event coverage

Stages and Predicates

Stage 1: selection

Indicators

Stage 1: `selection`