Justin Ibarra
59da2da474
* add unit tests to ensure host type and platform are included * add host.os.name 'linux' to all linux rules * add host.os.name macos to mac rules * add host.os.name to windows rules; fix linux dates * update from host.os.name to host.os.type Co-authored-by: brokensound77 <brokensound77@users.noreply.github.com> Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
70 lines
2.0 KiB
TOML
70 lines
2.0 KiB
TOML
[metadata]
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creation_date = "2023/01/23"
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integration = ["windows"]
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maturity = "production"
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min_stack_comments = "New fields added: required_fields, related_integrations, setup"
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min_stack_version = "8.3.0"
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updated_date = "2023/02/22"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies the use of Cmdlets and methods related to encryption/decryption of files in PowerShell scripts, which malware
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and offensive security tools can abuse to encrypt data or decrypt payloads to bypass security solutions.
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"""
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false_positives = ["Legitimate PowerShell Scripts which makes use of encryption."]
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from = "now-9m"
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index = ["winlogbeat-*", "logs-windows.*"]
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language = "kuery"
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license = "Elastic License v2"
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name = "PowerShell Script with Encryption/Decryption Capabilities"
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risk_score = 47
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rule_id = "1d9aeb0b-9549-46f6-a32d-05e2a001b7fd"
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severity = "medium"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion", "PowerShell"]
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timestamp_override = "event.ingested"
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type = "query"
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query = '''
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event.category:process and host.os.type:windows and
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powershell.file.script_block_text : (
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(
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"Cryptography.AESManaged" or
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"Cryptography.RijndaelManaged" or
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"Cryptography.SHA1Managed" or
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"Cryptography.SHA256Managed" or
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"Cryptography.SHA384Managed" or
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"Cryptography.SHA512Managed" or
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"Cryptography.SymmetricAlgorithm" or
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"PasswordDeriveBytes" or
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"Rfc2898DeriveBytes"
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) and
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(
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CipherMode and PaddingMode
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) and
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(
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".CreateEncryptor" or
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".CreateDecryptor"
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)
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) and not user.id : "S-1-5-18"
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1140"
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name = "Deobfuscate/Decode Files or Information"
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reference = "https://attack.mitre.org/techniques/T1140/"
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[[rule.threat.technique]]
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id = "T1027"
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name = "Obfuscated Files or Information"
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reference = "https://attack.mitre.org/techniques/T1027/"
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[rule.threat.tactic]
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id = "TA0005"
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name = "Defense Evasion"
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reference = "https://attack.mitre.org/tactics/TA0005/"
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