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P4T12ICK
80 lines
2.6 KiB
YAML
80 lines
2.6 KiB
YAML
name: Windows Private Keys Discovery
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id: 5c1c2877-06c0-40ee-a1a2-db71f1372b5b
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version: 1
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date: '2022-11-30'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: The following analytic identifies a process command line that retrieves
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information related to private keys files. This technique was seen in several post
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exploitation tools like winpeas that are being used by Ransomware Prestige to search
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for private key certificates on the compromised host for insecurely stored credentials.
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This files can be used by adversaries to gain privileges, persistence or remote
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service authentication to collect more sensitive information. Some private keys
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required password for operation, so in this case adversaries may need to have that
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passphrase either via keylogging or brute force attack.
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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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CommandLine: '*dir *'
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selection2:
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CommandLine:
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- '*.rdg*'
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- '*.gpg*'
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- '*.pgp*'
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- '*.p12*'
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- '*.der*'
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- '*.csr*'
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- '*.cer*'
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- '*.ovpn*'
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- '*.key*'
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- '*.ppk*'
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- '*.p12*'
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- '*.pem*'
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- '*.pfx*'
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- '*.p7b*'
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- '*.asc*'
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selection3:
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CommandLine: '*findstr*'
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condition: selection1 or selection2 or selection3
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA. Tune and filter known instances of wermgr.exe may be used.
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known_false_positives: unknown
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references:
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- https://attack.mitre.org/techniques/T1552/004/
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- https://github.com/carlospolop/PEASS-ng/tree/master/winPEAS
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- https://www.microsoft.com/en-us/security/blog/2022/10/14/new-prestige-ransomware-impacts-organizations-in-ukraine-and-poland/
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tags:
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analytic_story:
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- Windows Post-Exploitation
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- Prestige Ransomware
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: a process with commandline $process$ that can retrieve information related
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to private keys in $dest$
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mitre_attack_id:
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- T1552.004
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- T1552
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observable:
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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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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: 25
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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/malware/winpeas/winpeas_search_private_key/dir-private-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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