Persistence Via New SIP Provider

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

Detects when an attacker register a new SIP provider for persistence and defense evasion

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1553.003` Subvert Trust Controls: SIP and Trust Provider Hijacking

Event coverage

Provider	Event ID	Title
Sysmon	13	RegistryEvent (Value Set)

Stages and Predicates

Stage 1: `all of selection_root`

or:
TargetObject|contains: '\SOFTWARE\Microsoft\Cryptography\OID\EncodingType'
TargetObject|contains: '\SOFTWARE\Microsoft\Cryptography\Providers\'
TargetObject|contains: '\SOFTWARE\WOW6432Node\Microsoft\Cryptography\OID\EncodingType'
TargetObject|contains: '\SOFTWARE\WOW6432Node\Microsoft\Cryptography\Providers\'

Stage 2: `all of selection_dll`

or:
TargetObject|contains: '\$DLL'
TargetObject|contains: '\Dll'

Stage 3: `not 1 of filter*`

or:
Details: 'C:\Windows\System32\PsfSip.dll'
Image: 'C:\Windows\System32\poqexec.exe'
TargetObject|contains: '\CryptSIPDll'
Details: WINTRUST.DLL
Details: mso.dll

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	`C:\Windows\System32\PsfSip.dll` `WINTRUST.DLL` `mso.dll`
`Image`	eq	`C:\Windows\System32\poqexec.exe` corpus 7 (sigma 7)
`TargetObject`	match	`\$DLL` `\CryptSIPDll` `\Dll` `\SOFTWARE\Microsoft\Cryptography\OID\EncodingType` `\SOFTWARE\Microsoft\Cryptography\Providers\` `\SOFTWARE\WOW6432Node\Microsoft\Cryptography\OID\EncodingType` `\SOFTWARE\WOW6432Node\Microsoft\Cryptography\Providers\`