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pyth0n1c
78 lines
3.2 KiB
YAML
78 lines
3.2 KiB
YAML
name: Services Escalate Exe
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id: c448488c-b7ec-11eb-8253-acde48001122
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version: 1
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date: '2021-05-18'
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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 the use of `svc-exe` with Cobalt Strike.
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The behavior typically follows after an adversary has already gained initial access
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and is escalating privileges. Using `svc-exe`, a randomly named binary will be downloaded
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from the remote Teamserver and placed on disk within `C:\Windows\400619a.exe`. Following,
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the binary will be added to the registry under key `HKLM\System\CurrentControlSet\Services\400619a\`
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with multiple keys and values added to look like a legitimate service. Upon loading,
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`services.exe` will spawn the randomly named binary from `\\127.0.0.1\ADMIN$\400619a.exe`.
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The process lineage is completed with `400619a.exe` spawning rundll32.exe, which
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is the default `spawnto_` value for Cobalt Strike. The `spawnto_` value is arbitrary
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and may be any process on disk (typically system32/syswow64 binary). The `spawnto_`
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process will also contain a network connection. During triage, review parallel procesess
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and identify any additional file modifications.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=services.exe
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Processes.process_path=*admin$* by Processes.dest Processes.user Processes.parent_process
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `services_escalate_exe_filter`'
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how_to_implement: To successfully implement this search, you will need to ensure that
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DNS data is populating the Network_Resolution data model.
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known_false_positives: False positives should be limited as `services.exe` should
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never spawn a process from `ADMIN$`. Filter as needed.
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references:
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- https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
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- https://attack.mitre.org/techniques/T1548/
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- https://hstechdocs.helpsystems.com/manuals/cobaltstrike/current/userguide/index.htm#cshid=1085
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tags:
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analytic_story:
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- Cobalt Strike
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confidence: 95
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context:
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- Source:Endpoint
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- Stage:Privilege Escalation
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1055/cobalt_strike/windows-sysmon.log
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impact: 80
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kill_chain_phases:
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- Exploitation
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message: A service process $parent_process_name$ with process path $process_path$
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in host $dest$
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mitre_attack_id:
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- T1548
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observable:
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- name: Processes.dest
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type: Hostname
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role:
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- Victim
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- name: Processes.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
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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_id
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risk_score: 76
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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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asset_type: Endpoint
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