MITRE BZAR Indicators for Execution

Status: test
Severity: medium
Log source: product zeek, service dce_rpc
Author: @neu5ron, SOC Prime
Source: github.com/SigmaHQ/sigma

Windows DCE-RPC functions which indicate an execution techniques on the remote system. All credit for the Zeek mapping of the suspicious endpoint/operation field goes to MITRE

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1047` Windows Management Instrumentation, `T1053.002` Scheduled Task/Job: At, `T1569.002` System Services: Service Execution
Persistence	`T1053.002` Scheduled Task/Job: At
Privilege Escalation	`T1053.002` Scheduled Task/Job: At

Rule body yaml

title: MITRE BZAR Indicators for Execution
id: b640c0b8-87f8-4daa-aef8-95a24261dd1d
status: test
description: 'Windows DCE-RPC functions which indicate an execution techniques on the remote system. All credit for the Zeek mapping of the suspicious endpoint/operation field goes to MITRE'
references:
    - https://github.com/mitre-attack/bzar#indicators-for-attck-execution
author: '@neu5ron, SOC Prime'
date: 2020-03-19
modified: 2021-11-27
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.t1047
    - attack.t1053.002
    - attack.t1569.002
logsource:
    product: zeek
    service: dce_rpc
detection:
    op1:
        endpoint: 'JobAdd'
        operation: 'atsvc'
    op2:
        endpoint: 'ITaskSchedulerService'
        operation: 'SchRpcEnableTask'
    op3:
        endpoint: 'ITaskSchedulerService'
        operation: 'SchRpcRegisterTask'
    op4:
        endpoint: 'ITaskSchedulerService'
        operation: 'SchRpcRun'
    op5:
        endpoint: 'IWbemServices'
        operation: 'ExecMethod'
    op6:
        endpoint: 'IWbemServices'
        operation: 'ExecMethodAsync'
    op7:
        endpoint: 'svcctl'
        operation: 'CreateServiceA'
    op8:
        endpoint: 'svcctl'
        operation: 'CreateServiceW'
    op9:
        endpoint: 'svcctl'
        operation: 'StartServiceA'
    op10:
        endpoint: 'svcctl'
        operation: 'StartServiceW'
    condition: 1 of op*
falsepositives:
    - Windows administrator tasks or troubleshooting
    - Windows management scripts or software
level: medium

Stages and Predicates

Stage 0: `condition`

1 of op*

Stage 1: `op1`

op1:
    endpoint: 'JobAdd'
    operation: 'atsvc'

Stage 2: `op2`

op2:
    endpoint: 'ITaskSchedulerService'
    operation: 'SchRpcEnableTask'

Stage 3: `op3`

op3:
    endpoint: 'ITaskSchedulerService'
    operation: 'SchRpcRegisterTask'

Stage 4: `op4`

op4:
    endpoint: 'ITaskSchedulerService'
    operation: 'SchRpcRun'

Stage 5: `op5`

op5:
    endpoint: 'IWbemServices'
    operation: 'ExecMethod'

Stage 6: `op6`

op6:
    endpoint: 'IWbemServices'
    operation: 'ExecMethodAsync'

Stage 7: `op7`

op7:
    endpoint: 'svcctl'
    operation: 'CreateServiceA'

Stage 8: `op8`

op8:
    endpoint: 'svcctl'
    operation: 'CreateServiceW'

Stage 9: `op9`

op9:
    endpoint: 'svcctl'
    operation: 'StartServiceA'

Stage 10: `op10`

op10:
    endpoint: 'svcctl'
    operation: 'StartServiceW'

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
`endpoint`	eq	`ITaskSchedulerService` `IWbemServices` `JobAdd` `svcctl`
`operation`	eq	`CreateServiceA` `CreateServiceW` `ExecMethod` `ExecMethodAsync` `SchRpcEnableTask` `SchRpcRegisterTask` `SchRpcRun` `StartServiceA` `StartServiceW` `atsvc`

`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)

MITRE BZAR Indicators for Execution

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `op1`

Stage 2: `op2`

Stage 3: `op3`

Stage 4: `op4`

Stage 5: `op5`

Stage 6: `op6`

Stage 7: `op7`

Stage 8: `op8`

Stage 9: `op9`

Stage 10: `op10`

Indicators

Keyboard shortcuts

Search operators

MITRE BZAR Indicators for Execution

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: op1

Stage 2: op2

Stage 3: op3

Stage 4: op4

Stage 5: op5

Stage 6: op6

Stage 7: op7

Stage 8: op8

Stage 9: op9

Stage 10: op10

Indicators

Stage 0: `condition`

Stage 1: `op1`

Stage 2: `op2`

Stage 3: `op3`

Stage 4: `op4`

Stage 5: `op5`

Stage 6: `op6`

Stage 7: `op7`

Stage 8: `op8`

Stage 9: `op9`

Stage 10: `op10`