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https://github.com/splunk/security_content
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pyth0n1c
74 lines
2.8 KiB
YAML
74 lines
2.8 KiB
YAML
name: Print Spooler Adding A Printer Driver
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id: 313681a2-da8e-11eb-adad-acde48001122
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version: 1
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date: '2021-07-01'
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author: Mauricio Velazco, Michael Haag, Teoderick Contreras, 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 new printer drivers being load by
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utilizing the Windows PrintService operational logs, EventCode 316. This was identified
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during our testing of CVE-2021-34527 previously (CVE-2021-1675) or PrintNightmare.
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\
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Within the proof of concept code, the following event will occur - "Printer driver
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1234 for Windows x64 Version-3 was added or updated. Files:- UNIDRV.DLL, kernelbase.dll,
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evil.dll. No user action is required." \
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During triage, isolate the endpoint and review for source of exploitation. Capture
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any additional file modification events and review the source of where the exploitation
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began.'
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search: '`printservice` EventCode=316 category = "Adding a printer driver" Message
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= "*kernelbase.dll,*" Message = "*UNIDRV.DLL,*" Message = "*.DLL.*" | stats count
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min(_time) as firstTime max(_time) as lastTime by OpCode EventCode ComputerName
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Message | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `print_spooler_adding_a_printer_driver_filter`'
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how_to_implement: You will need to ensure PrintService Admin and Operational logs
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are being logged to Splunk from critical or all systems.
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known_false_positives: Unknown. This may require filtering.
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references:
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- https://twitter.com/MalwareJake/status/1410421445608476679?s=20
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- https://www.truesec.com/hub/blog/fix-for-printnightmare-cve-2021-1675-exploit-to-keep-your-print-servers-running-while-a-patch-is-not-available
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- https://www.truesec.com/hub/blog/exploitable-critical-rce-vulnerability-allows-regular-users-to-fully-compromise-active-directory-printnightmare-cve-2021-1675
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- https://www.reddit.com/r/msp/comments/ob6y02/critical_vulnerability_printnightmare_exposes
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tags:
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analytic_story:
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- PrintNightmare CVE-2021-34527
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confidence: 90
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context:
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- Source:Endpoint
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- Stage:Persistence
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- Stage:Privilege Escalation
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- Stage:Defense Evasion
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- Scope:Inbound
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cve:
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- CVE-2021-34527
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- CVE-2021-1675
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1547.012/printnightmare/windows-printservice_operational.log
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impact: 80
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kill_chain_phases:
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- Exploitation
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message: Suspicious print driver was loaded on endpoint $ComputerName$.
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mitre_attack_id:
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- T1547.012
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- T1547
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observable:
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- name: ComputerName
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type: Endpoint
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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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- OpCode
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- EventCode
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- ComputerName
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- Message
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risk_score: 72
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security_domain: endpoint
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asset_type: Endpoint
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