| id | WIN-190725024610 |
| author | Roberto Rodriguez @Cyb3rWard0g |
| creation date | 2019/07/25 |
| platform | Windows |
| playbook link | WIN-190625024610 |
Every computer that runs Windows has its own local domain; that is, it has an account database for accounts that are specific to that computer. Conceptually,this is an account database like any other with accounts, groups, SIDs, and so on. These are referred to as local accounts, local groups, and so on. Because computers typically do not trust each other for account information, these identities stay local to the computer on which they were created. Adversaries might use tools like Mimikatz with lsadump::sam commands or scripts such as Invoke-PowerDump to get the SysKey to decrypt Security Account Mannager (SAM) database entries (from registry or hive) and get NTLM, and sometimes LM hashes of local accounts passwords.
In addition, adversaries can use the built-in Reg.exe utility to dump the SAM hive in order to crack it offline.
Additional reading
In [ ]:
from openhunt.mordorutils import *
spark = get_spark()
In [ ]:
mordor_file = "https://raw.githubusercontent.com/hunters-forge/mordor/master/small_datasets/windows/credential_access/credential_dumping_T1003/credentials_from_registry/empire_mimikatz_lsadump_sam.tar.gz"
registerMordorSQLTable(spark, mordor_file, "mordorTable")
| FP Rate | Log Channel | Description |
|---|---|---|
| Medium | ['Security'] | Monitor for any handle requested for the SAM registry hive |
In [ ]:
df = spark.sql(
'''
SELECT `@timestamp`, computer_name, SubjectUserName, ProcessName, ObjectName, AccessMask
FROM mordorTable
WHERE channel = "Security"
AND event_id = 4656
AND ObjectType = "Key"
AND lower(ObjectName) LIKE "%sam"
'''
)
df.show(1,False)
| Category | Type | Name |
|---|---|---|
| signature | SIGMA | win_sam_registry_hive_handle_request |
| signature | SIGMA | win_sam_registry_hive_dump_via_reg_utility |