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pyth0n1c
90 lines
3.2 KiB
YAML
90 lines
3.2 KiB
YAML
name: Suspicious msbuild path
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id: f5198224-551c-11eb-ae93-0242ac130002
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version: 3
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date: '2022-03-08'
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author: Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The following analytic identifies msbuild.exe executing from a non-standard
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path. Msbuild.exe is natively found in C:\Windows\Microsoft.NET\Framework\v4.0.30319
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and C:\Windows\Microsoft.NET\Framework64\v4.0.30319. Instances of Visual Studio
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will run a copy of msbuild.exe. A moved instance of MSBuild is suspicious, however
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there are instances of build applications that will move or use a copy of MSBuild.
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search: '| tstats `security_content_summariesonly` count values(Processes.process_name)
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as process_name values(Processes.process) as process min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where `process_msbuild` AND (Processes.process_path!=*\\framework*\\v*\\*)
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by Processes.dest Processes.original_file_name Processes.parent_process Processes.user
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`|
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`suspicious_msbuild_path_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: Some legitimate applications may use a moved copy of msbuild.exe,
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triggering a false positive. Baselining of MSBuild.exe usage is recommended to better
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understand it's path usage. Visual Studio runs an instance out of a path that will
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need to be filtered on.
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references:
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- https://lolbas-project.github.io/lolbas/Binaries/Msbuild/
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1127.001/T1127.001.md
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tags:
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analytic_story:
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- Trusted Developer Utilities Proxy Execution MSBuild
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- Cobalt Strike
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- Masquerading - Rename System Utilities
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- Living Off The Land
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asset_type: Endpoint
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cis20:
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- CIS 8
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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- Stage:Execution
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1127.001/windows-sysmon.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: Msbuild.exe ran from an uncommon path on $dest$ execyted by $user$
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mitre_attack_id:
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- T1036
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- T1127
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- T1036.003
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- T1127.001
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nist:
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- PR.PT
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- DE.CM
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: User
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type: User
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 49
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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