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87 lines
3.4 KiB
YAML
87 lines
3.4 KiB
YAML
name: BITS Job Persistence
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id: e97a5ffe-90bf-11eb-928a-acde48001122
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version: 1
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date: '2021-03-29'
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author: Michael Haag, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: The following query identifies Microsoft Background Intelligent Transfer
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Service utility `bitsadmin.exe` scheduling a BITS job to persist on an endpoint.
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The query identifies the parameters used to create, resume or add a file to a BITS
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job. Typically seen combined in a oneliner or ran in sequence. If identified, review
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the BITS job created and capture any files written to disk. It is possible for BITS
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to be used to upload files and this may require further network data analysis to
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identify. You can use `bitsadmin /list /verbose` to list out the jobs during investigation.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process_name=bitsadmin.exe
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Processes.process IN (*create*, *addfile*, *setnotifyflags*, *setnotifycmdline*,
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*setminretrydelay*, *setcustomheaders*, *resume* ) by Processes.dest Processes.user
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Processes.parent_process Processes.process_name Processes.process Processes.process_id
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Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `bits_job_persistence_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.
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known_false_positives: Limited false positives will be present. Typically, applications
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will use `BitsAdmin.exe`. Any filtering should be done based on command-line arguments
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(legitimate applications) or parent process.
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references:
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- https://attack.mitre.org/techniques/T1197/
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- https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/bitsadmin
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1197/T1197.md#atomic-test-3---persist-download--execute
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- https://lolbas-project.github.io/lolbas/Binaries/Bitsadmin/
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tags:
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analytic_story:
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- BITS Jobs
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automated_detection_testing: passed
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confidence: 80
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context:
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- Source:Endpoint
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- Stage:Persistence
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1197/atomic_red_team/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: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$ attempting to persist using BITS.
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mitre_attack_id:
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- T1197
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observable:
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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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- name: dest
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Parent Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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: 56
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security_domain: endpoint
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