Query: write Sigma for Detects the presence of unicode characters which are homoglyphs, or identical in appearance, to ASCII letter characters.
Matching passage: Sigma rule: Detects the presence of unicode characters which are homoglyphs, or identical in appearance, to ASCII letter characters.. Logsource: windows / file_event. Rule: title: Potential Homoglyph Attack Using Lookalike Characters in Filename id: 4f1707b1-b50b-45b4-b5a2-3978b5a5d0d6 status: test description: 'Detects the presence of unicode characters which are homoglyphs, or identical in appearance, to ASCII letter characters. This is used as an obfuscation and masquerading techniques. Only "perfect" homoglyphs are included; these are characters that are indistinguishable from ASCII characters and thus may make excellent candidates for homoglyph attack characters. ' references: - https://redcanary.com/threat-detection-report/threats/socgholish/#threat-socgholish - http://www.irongeek.com/homoglyph-attack-generator.php author: Micah Babinski, @micahbabinski date: 2023-05-08 tags: - attack.stealth - attack.t1036 - attack.t1036.003 logsource: category: file_event product: windows detection: selection_upper: TargetFilename|contains: - А - В - Е - К - М - Н - О - Р - С - Т - Х - Ѕ - І - Ј - Ү - Ӏ - Ԍ - Ԛ - Ԝ - Α - Β - Ε - Ζ - Η - Ι - Κ - Μ - Ν - Ο - Ρ - Τ - Υ - Χ selection_lower: TargetFilename|contains: - а - е - о - р - с - х - ѕ - і - ӏ - ј - һ - ԁ - ԛ - ԝ - ο condition: 1 of selection_* falsepositives: - File names with legitimate Cyrillic text. Will likely require tuning (or not be usable) in countries where these alphabets are in use. level: medium
Near-miss passage: Sigma rule: Detects the registration of a new ODBC driver where the driver is located in a potentially suspicious location. Logsource: windows / registry_set. Rule: title: Potentially Suspicious ODBC Driver Registered id: e4d22291-f3d5-4b78-9a0c-a1fbaf32a6a4 status: test description: Detects the registration of a new ODBC driver where the driver is located in a potentially suspicious location references: - https://www.hexacorn.com/blog/2020/08/23/odbcconf-lolbin-trifecta/ author: Nasreddine Bencherchali (Nextron Systems) date: 2023-05-23 modified: 2023-08-17 tags: - attack.credential-access - attack.persistence - attack.t1003 logsource: category: registry_set product: windows detection: selection: TargetObject|contains: \SOFTWARE\ODBC\ODBCINST.INI\ TargetObject|endswith: - \Driver - \Setup Details|contains: - :\PerfLogs\ - :\ProgramData\ - :\Temp\ - :\Users\Public\ - :\Windows\Registration\CRMLog - :\Windows\System32\com\dmp\ - :\Windows\System32\FxsTmp\ - :\Windows\System32\Microsoft\Crypto\RSA\MachineKeys\ - :\Windows\System32\spool\drivers\color\ - :\Windows\System32\spool\PRINTERS\ - :\Windows\System32\spool\SERVERS\ - :\Windows\System32\Tasks_Migrated\ - :\Windows\System32\Tasks\Microsoft\Windows\SyncCenter\ - :\Windows\SysWOW64\com\dmp\ - :\Windows\SysWOW64\FxsTmp\ - :\Windows\SysWOW64\Tasks\Microsoft\Windows\PLA\System\ - :\Windows\SysWOW64\Tasks\Microsoft\Windows\SyncCenter\ - :\Windows\Tasks\ - :\Windows\Temp\ - :\Windows\Tracing\ - \AppData\Local\Temp\ - \AppData\Roaming\ condition: selection falsepositives: - Unlikely level: high