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Detection rules › Sigma

Old TLS1.0/TLS1.1 Protocol Version Enabled

Severity
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

Detects applications or users re-enabling old TLS versions by setting the "Enabled" value to "1" for the "Protocols" registry key.

Event coverage

ProviderEvent IDTitle
Sysmon13RegistryEvent (Value Set)

Stages and Predicates

Stage 1: selection

or:
TargetObject|contains: '\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\'
TargetObject|contains: '\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\'
Details: 'DWORD (0x00000001)'
TargetObject|endswith: '\Enabled'

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.

FieldKindValues
Detailseq
  • DWORD (0x00000001) corpus 37 (sigma 37)
TargetObjectends_with
  • \Enabled corpus 2 (sigma 2)
TargetObjectmatch
  • \Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\
  • \Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\