Detect LolDriver drop or load from unknown or unsigned process

Author: Robbe Van den Daele
Source: github.com/HybridBrothers/Hunting-Queries-Detection-Rules

Adversaries may use LolDrivers to elevate their privileges on a system. Regularly, their drop their own LolDrivers from their beacon process when the LolDriver is not yet present on the system. This is a detection use case to detect an unknown process dropping these LolDrivers.

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1068` Exploitation for Privilege Escalation

References

https://thecollective.eu/

Event coverage

Provider	ActionType	Title
Defender-DeviceEvents	any	Defender event (any)

Rule body yaml

let LOLDrivers = externaldata(Category:string, KnownVulnerableSamples:dynamic, Verified:string ) [h@"https://www.loldrivers.io/api/drivers.json"]
     with (
       format=multijson,
       ingestionMapping=@'[{"Column":"Category","Properties":{"Path":"$.Category"}},{"Column":"KnownVulnerableSamples","Properties":{"Path":"$.KnownVulnerableSamples"}},{"Column":"Verified","Properties":{"Path":"$.Verified"}}]'
     )
    | mv-expand KnownVulnerableSamples
    | extend SHA1 = tostring(KnownVulnerableSamples.SHA1), SHA256 = tostring(KnownVulnerableSamples.SHA256)
;
let SHA1List = toscalar(
    LOLDrivers
    | summarize make_set(SHA1)
);
let SHA256List = toscalar(
    LOLDrivers
    | summarize make_set(SHA256)
);
let device_events = (
    DeviceEvents
    | where Timestamp > ago(1h)
    | where ActionType == "DriverLoaded"
    | where SHA1 in ( SHA1List ) or SHA256 in ( SHA256List )
);
let device_file_events = (
    DeviceFileEvents
    | where Timestamp > ago(1h)
    | where ActionType == "FileCreated"
    | where SHA1 in ( SHA1List ) or SHA256 in ( SHA256List )
);
union device_events, device_file_events
| invoke FileProfile(InitiatingProcessSHA1)
| where GlobalPrevalence < 1000 or SignatureState =~ "Unsigned"

Stages and Predicates

Let binding: `LOLDrivers`

let LOLDrivers = externaldata(Category:string, KnownVulnerableSamples:dynamic, Verified:string ) [h@"https://www.loldrivers.io/api/drivers.json"]
     with (
       format=multijson,
       ingestionMapping=@'[{"Column":"Category","Properties":{"Path":"$.Category"}},{"Column":"KnownVulnerableSamples","Properties":{"Path":"$.KnownVulnerableSamples"}},{"Column":"Verified","Properties":{"Path":"$.Verified"}}]'
     )
    | mv-expand KnownVulnerableSamples
    | extend SHA1 = tostring(KnownVulnerableSamples.SHA1), SHA256 = tostring(KnownVulnerableSamples.SHA256);

Let binding: `SHA1List`

let SHA1List = toscalar(
    LOLDrivers
    | summarize make_set(SHA1)
);

Derived from LOLDrivers.

Let binding: `SHA256List`

let SHA256List = toscalar(
    LOLDrivers
    | summarize make_set(SHA256)
);

Derived from LOLDrivers.

Let binding: `device_events`

let device_events = (
    DeviceEvents
    | where Timestamp > ago(1h)
    | where ActionType == "DriverLoaded"
    | where SHA1 in ( SHA1List ) or SHA256 in ( SHA256List )
);

Derived from SHA1List, SHA256List.

Let binding: `device_file_events`

let device_file_events = (
    DeviceFileEvents
    | where Timestamp > ago(1h)
    | where ActionType == "FileCreated"
    | where SHA1 in ( SHA1List ) or SHA256 in ( SHA256List )
);

Derived from SHA1List, SHA256List.

union (2 sources)

Each leg below queries one source; the rule matches if any leg does. Sources: device_events, device_file_events

Leg 1: `device_events`

Leg 2: `device_file_events`

Applied to the combined result

| invoke FileProfile(InitiatingProcessSHA1) | where GlobalPrevalence < 1000 or SignatureState =~ "Unsigned"

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
`ActionType`	eq	`DriverLoaded` transforms: `cased` `FileCreated` transforms: `cased` corpus 8 (kusto 8)
`GlobalPrevalence`	lt	`1000` transforms: `cased` corpus 4 (kusto 4)
`SHA1`	in	`SHA1List` transforms: `cased`
`SHA256`	in	`SHA256List` transforms: `cased`
`SignatureState`	eq	`Unsigned`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Detect LolDriver drop or load from unknown or unsigned process

MITRE ATT&CK coverage

References

Event coverage

Rule body yaml

Stages and Predicates

Let binding: `LOLDrivers`

Let binding: `SHA1List`

Let binding: `SHA256List`

Let binding: `device_events`

Let binding: `device_file_events`

union (2 sources)

Leg 1: `device_events`

Leg 2: `device_file_events`

Applied to the combined result

Indicators

Keyboard shortcuts

Search operators

Detect LolDriver drop or load from unknown or unsigned process

MITRE ATT&CK coverage

References

Event coverage

Rule body yaml

Stages and Predicates

Let binding: LOLDrivers

Let binding: SHA1List

Let binding: SHA256List

Let binding: device_events

Let binding: device_file_events

union (2 sources)

Leg 1: device_events

Leg 2: device_file_events

Applied to the combined result

Indicators

Let binding: `LOLDrivers`

Let binding: `SHA1List`

Let binding: `SHA256List`

Let binding: `device_events`

Let binding: `device_file_events`

Leg 1: `device_events`

Leg 2: `device_file_events`