Impair Defenses: Downgrade Attack T1562.010

Tactic: Stealth

Adversaries may downgrade or use a version of system features that may be outdated, vulnerable, and/or does not support updated security controls. Downgrade attacks typically take advantage of a system’s backward compatibility to force it into less secure modes of operation.

Events covered

3 catalog events are tagged with this technique by at least one rule.

Authoring guide

Patterns shared across the 5 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.

Fields filtered most (7 distinct)

The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.

FieldRulesHowSample values
Details3contains 1, eq 1, in 10x00000000, 0, 0x00000001, 0x00000002
EventType2ne 2deletion
TargetObject2ends_with 1, wildcard 1\registry\machine\system\*controlset*\control\terminal..., \system\currentcontrolset\control\lsa\lmcompatibilitylevel, hklm\system\controlset*\control\terminal..., machine\system\*controlset*\control\terminal...
registry_value_name2eq 2LmCompatibilityLevel, UserAuthentication
RegName1eq 1AllowInsecureGuestAuth
RegValue1eq 11
http.version1is_not_null 1

Top indicator values (20 distinct)

Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique. Click a value to expand the rules under this technique that use it.

FieldKindValueRules (here)Corpus reach
EventTypene
deletion
211
Detailscontains
0x00000000
1
Detailscontains
0x00000001
14
Detailscontains
0x00000002
1
Detailseq
0
112
Detailseq
0x00000000
143
Detailsin
0
13
Detailsin
0x00000000
12
Detailsin
0x00000001
12
Detailsin
0x00000002
1
Detailsin
1
1
Detailsin
2
1
RegNameeq
AllowInsecureGuestAuth
1
RegValueeq
1
1
TargetObjectends_with
\system\currentcontrolset\control\lsa\lmcompatibilitylevel
1
TargetObjectwildcard
\registry\machine\system\*controlset*\control\terminal...
1
TargetObjectwildcard
hklm\system\controlset*\control\terminal...
1
TargetObjectwildcard
machine\system\*controlset*\control\terminal...
1
registry_value_nameeq
LmCompatibilityLevel
1
registry_value_nameeq
UserAuthentication
1

Rules under this technique

Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.

Platform (all)
Domain (all)

Sigma 2 rules

Elastic 3 rules