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mukul975
757f1c8eae
- implementing-vulnerability-management-with-greenbone: python-gvm GMP API, scan task creation, XML report parsing - detecting-email-account-compromise: Microsoft Graph inbox rules, impossible travel detection, OAuth grant analysis - performing-threat-intelligence-sharing-with-misp: PyMISP event creation, attribute management, sharing validation - analyzing-cobaltstrike-malleable-c2-profiles: dissect.cobaltstrike C2Profile parsing, Suricata rule generation - hunting-for-registry-run-key-persistence: Sysmon Event 13 analysis, T1547.001 detection, Sigma rule generation
99 lines
2.7 KiB
Markdown
99 lines
2.7 KiB
Markdown
# Credential Dumping Detection API Reference
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## Sysmon Event ID 10 - ProcessAccess
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### Key Fields
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```
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SourceImage - Process accessing LSASS
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SourceProcessId - PID of accessing process
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TargetImage - Should be C:\Windows\System32\lsass.exe
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GrantedAccess - Access rights bitmask
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CallTrace - DLL call stack of the access
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```
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### Suspicious GrantedAccess Values
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| Value | Meaning | Tool Association |
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|-------|---------|-----------------|
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| 0x1010 | VM_READ + QUERY_LIMITED | Mimikatz |
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| 0x1410 | VM_READ + QUERY_INFO | ProcDump |
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| 0x1FFFFF | PROCESS_ALL_ACCESS | Various dumpers |
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| 0x1438 | VM_READ + QUERY + DUP_HANDLE | Cobalt Strike |
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| 0x40 | DUP_HANDLE only | Handle duplication |
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## Sysmon Event ID 1 - Process Creation
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### Command Line Patterns for Credential Theft
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```
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# SAM hive export
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reg save hklm\sam C:\temp\sam.hiv
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reg save hklm\security C:\temp\security.hiv
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reg save hklm\system C:\temp\system.hiv
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# comsvcs.dll LSASS dump
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rundll32.exe C:\Windows\System32\comsvcs.dll, MiniDump <lsass_pid> dump.bin full
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# NTDS.dit extraction
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ntdsutil "activate instance ntds" ifm "create full C:\temp"
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vssadmin create shadow /for=C:
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```
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## Splunk SPL Queries
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### LSASS Access Detection
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```spl
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index=sysmon EventCode=10 TargetImage="*\\lsass.exe"
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GrantedAccess IN ("0x1010","0x1FFFFF","0x1410","0x1438")
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SourceImage!="*\\csrss.exe" SourceImage!="*\\svchost.exe"
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| stats count by SourceImage, GrantedAccess, Computer, User
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| sort -count
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```
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### comsvcs.dll MiniDump Detection
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```spl
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index=sysmon EventCode=1
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(CommandLine="*comsvcs*MiniDump*" OR CommandLine="*comsvcs*#24*")
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| table _time, Computer, User, ParentImage, CommandLine
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```
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### SAM/SECURITY Hive Export
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```spl
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index=sysmon EventCode=1 Image="*\\reg.exe"
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(CommandLine="*save*hklm\\sam*" OR CommandLine="*save*hklm\\security*")
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| table _time, Computer, User, CommandLine
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```
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## Elastic / KQL Queries
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### LSASS Access in Elastic
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```kql
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event.code: "10" AND
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winlog.event_data.TargetImage: *lsass.exe AND
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winlog.event_data.GrantedAccess: ("0x1010" OR "0x1FFFFF")
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```
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### Process Creation with Credential Theft Commands
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```kql
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event.code: "1" AND
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(process.command_line: *comsvcs*MiniDump* OR
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process.command_line: *reg*save*hklm\\sam*)
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```
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## MITRE ATT&CK Mapping
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| Sub-technique | ID | Detection Method |
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|---|---|---|
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| LSASS Memory | T1003.001 | Sysmon EID 10 GrantedAccess |
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| Security Account Manager | T1003.002 | reg.exe save commands |
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| NTDS | T1003.003 | ntdsutil / vssadmin commands |
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| DCSync | T1003.006 | Event ID 4662 with replication GUIDs |
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## CLI Usage
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```bash
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# Analyze Sysmon XML export
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python agent.py --sysmon-xml sysmon_events.xml --output cred_report.json
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# Print Splunk detection queries
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python agent.py --show-splunk
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```
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