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New rule system language discovery via reg.exe #5845
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Binary file added
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+68 KB
...proc_creation_win_reg_system_language_discovery/c43a5405-e8e1-4221-9ac9-dbe3fa14e886.evtx
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66 changes: 66 additions & 0 deletions
66
...proc_creation_win_reg_system_language_discovery/c43a5405-e8e1-4221-9ac9-dbe3fa14e886.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| { | ||
| "Event": { | ||
| "#attributes": { | ||
| "xmlns": "http://schemas.microsoft.com/win/2004/08/events/event" | ||
| }, | ||
| "System": { | ||
| "Provider": { | ||
| "#attributes": { | ||
| "Name": "Microsoft-Windows-Sysmon", | ||
| "Guid": "5770385F-C22A-43E0-BF4C-06F5698FFBD9" | ||
| } | ||
| }, | ||
| "EventID": 1, | ||
| "Version": 5, | ||
| "Level": 4, | ||
| "Task": 1, | ||
| "Opcode": 0, | ||
| "Keywords": "0x8000000000000000", | ||
| "TimeCreated": { | ||
| "#attributes": { | ||
| "SystemTime": "2026-01-19T16:11:39.281042Z" | ||
| } | ||
| }, | ||
| "EventRecordID": 553, | ||
| "Correlation": null, | ||
| "Execution": { | ||
| "#attributes": { | ||
| "ProcessID": 5928, | ||
| "ThreadID": 9720 | ||
| } | ||
| }, | ||
| "Channel": "Microsoft-Windows-Sysmon/Operational", | ||
| "Computer": "DESKTOP-54JCEU5", | ||
| "Security": { | ||
| "#attributes": { | ||
| "UserID": "S-1-5-18" | ||
| } | ||
| } | ||
| }, | ||
| "EventData": { | ||
| "RuleName": "-", | ||
| "UtcTime": "2026-01-19 16:11:39.278", | ||
| "ProcessGuid": "34E9093F-57BB-696E-7001-000000000300", | ||
| "ProcessId": 4392, | ||
| "Image": "C:\\Windows\\System32\\reg.exe", | ||
| "FileVersion": "10.0.19041.1 (WinBuild.160101.0800)", | ||
| "Description": "Registry Console Tool", | ||
| "Product": "Microsoft® Windows® Operating System", | ||
| "Company": "Microsoft Corporation", | ||
| "OriginalFileName": "reg.exe", | ||
| "CommandLine": "reg query HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Nls\\Language", | ||
| "CurrentDirectory": "C:\\Users\\marco\\", | ||
| "User": "DESKTOP-54JCEU5\\marco", | ||
| "LogonGuid": "34E9093F-54FA-696E-7C2B-070000000000", | ||
| "LogonId": "0x72b7c", | ||
| "TerminalSessionId": 1, | ||
| "IntegrityLevel": "Medium", | ||
| "Hashes": "MD5=227F63E1D9008B36BDBCC4B397780BE4,SHA256=C0E25B1F9B22DE445298C1E96DDFCEAD265CA030FA6626F61A4A4786CC4A3B7D,IMPHASH=BE482BE427FE212CFEF2CDA0E61F19AC", | ||
| "ParentProcessGuid": "34E9093F-57AD-696E-6E01-000000000300", | ||
| "ParentProcessId": 12188, | ||
| "ParentImage": "C:\\Windows\\System32\\cmd.exe", | ||
| "ParentCommandLine": "\"C:\\Windows\\system32\\cmd.exe\"", | ||
| "ParentUser": "DESKTOP-54JCEU5\\marco" | ||
| } | ||
| } | ||
| } |
13 changes: 13 additions & 0 deletions
13
...a/rules/windows/process_creation/proc_creation_win_reg_system_language_discovery/info.yml
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|---|---|---|
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| id: 70cc76fe-3470-48ad-b15f-5714ad17a5c6 | ||
| description: N/A | ||
| date: 2026-01-19 | ||
| author: Marco Pedrinazzi (@pedrinazziM) (InTheCyber) | ||
| rule_metadata: | ||
| - id: c43a5405-e8e1-4221-9ac9-dbe3fa14e886 | ||
| title: System Language Discovery via Reg.Exe | ||
| regression_tests_info: | ||
| - name: Positive Detection Test | ||
| type: evtx | ||
| provider: Microsoft-Windows-Sysmon | ||
| match_count: 1 | ||
| path: regression_data/rules/windows/process_creation/proc_creation_win_reg_system_language_discovery/c43a5405-e8e1-4221-9ac9-dbe3fa14e886.evtx |
35 changes: 35 additions & 0 deletions
35
rules/windows/process_creation/proc_creation_win_reg_system_language_discovery.yml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| title: System Language Discovery via Reg.Exe | ||
| id: c43a5405-e8e1-4221-9ac9-dbe3fa14e886 | ||
| status: experimental | ||
| description: | | ||
| Detects the usage of Reg.Exe to query system language settings. | ||
| Attackers may discover the system language to determine the geographic location of victims, customize payloads for specific regions, | ||
| or avoid targeting certain locales to evade detection. | ||
| references: | ||
| - https://scythe.io/threat-thursday/threatthursday-darkside-ransomware | ||
| author: Marco Pedrinazzi (@pedrinazziM) (InTheCyber) | ||
| date: 2026-01-09 | ||
| tags: | ||
| - attack.discovery | ||
| - attack.t1614.001 | ||
| logsource: | ||
| category: process_creation | ||
| product: windows | ||
| detection: | ||
| selection_img: | ||
| - Image|endswith: '\reg.exe' | ||
| - OriginalFileName: 'reg.exe' | ||
| selection_cli: | ||
| CommandLine|contains|all: | ||
| - 'query' | ||
| - 'Control\Nls\Language' | ||
| condition: all of selection_* | ||
| falsepositives: | ||
| - Unknown | ||
| level: medium | ||
| regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_reg_system_language_discovery/info.yml | ||
| simulation: | ||
| - type: atomic-red-team | ||
| name: Discover System Language by Registry Query | ||
| technique: T1614.001 | ||
| atomic_guid: 631d4cf1-42c9-4209-8fe9-6bd4de9421be | ||
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Note for myself to double check this before merge.