Potential AutoLogger Sessions Tampering

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

Detects tampering with autologger trace sessions which is a technique used by attackers to disable logging

Event coverage

Provider	Event ID	Title
Sysmon	13	RegistryEvent (Value Set)

Stages and Predicates

Stage 1: `all of selection_main`

TargetObject|contains: '\System\CurrentControlSet\Control\WMI\Autologger\'

Stage 2: `all of selection_values`

or:
TargetObject|endswith: '\Enable'
TargetObject|endswith: '\Start'
or:
TargetObject|contains: '\Defender'
TargetObject|contains: '\EventLog-'
Details: 'DWORD (0x00000000)'

Stage 3: `not 1 of filter_main_*`

or:
or:
Image|startswith: 'C:\Program Files (x86)\Windows Defender\'
Image|startswith: 'C:\Program Files\Windows Defender\'
Image|startswith: 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
or:
TargetObject|contains: '\DefenderApiLogger\'
TargetObject|contains: '\DefenderAuditLogger\'
Image|endswith: '\MsMpEng.exe'
Image: 'C:\Windows\system32\wevtutil.exe'

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
`Details`	eq	`DWORD (0x00000000)` corpus 38 (sigma 38)
`Image`	ends_with	`\MsMpEng.exe` corpus 13 (sigma 13)
`Image`	eq	`C:\Windows\system32\wevtutil.exe` corpus 2 (sigma 2)
`Image`	starts_with	`C:\Program Files (x86)\Windows Defender\` corpus 5 (sigma 5) `C:\Program Files\Windows Defender\` corpus 5 (sigma 5) `C:\ProgramData\Microsoft\Windows Defender\Platform\` corpus 7 (sigma 7)
`TargetObject`	ends_with	`\Enable` `\Start` corpus 2 (sigma 2)
`TargetObject`	match	`\Defender` `\DefenderApiLogger\` `\DefenderAuditLogger\` `\EventLog-` `\System\CurrentControlSet\Control\WMI\Autologger\`