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P4T12ICK
72 lines
2.5 KiB
YAML
72 lines
2.5 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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status: production
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type: TTP
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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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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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OriginalFileName: MSBuild.exe
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selection2:
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Image|endswith: msbuild.exe
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selection3:
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Processes.process_path: '*\\framework*\\v*\\*'
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condition: (selection1 or selection2) and selection3
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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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confidence: 70
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impact: 70
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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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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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risk_score: 49
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1127.001/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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update_timestamp: true
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