LSASS Access From Potentially White-Listed Processes

calendar Dec 4, 2023 · attack.credential_access attack.t1003.001 attack.s0002  ·
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Detects a possible process memory dump that uses a white-listed filename like TrolleyExpress.exe as a way to dump the LSASS process memory without Microsoft Defender interference

Sigma rule (View on GitHub)

 1title: LSASS Access From Potentially White-Listed Processes
 2id: 4be8b654-0c01-4c9d-a10c-6b28467fc651
 3status: test
 4description: |
 5        Detects a possible process memory dump that uses a white-listed filename like TrolleyExpress.exe as a way to dump the LSASS process memory without Microsoft Defender interference
 6references:
 7    - https://twitter.com/_xpn_/status/1491557187168178176
 8    - https://www.ired.team/offensive-security/credential-access-and-credential-dumping/dump-credentials-from-lsass-process-without-mimikatz
 9    - https://twitter.com/mrd0x/status/1460597833917251595
10author: Florian Roth (Nextron Systems)
11date: 2022/02/10
12modified: 2023/11/29
13tags:
14    - attack.credential_access
15    - attack.t1003.001
16    - attack.s0002
17logsource:
18    category: process_access
19    product: windows
20detection:
21    selection:
22        TargetImage|endswith: '\lsass.exe'
23        SourceImage|endswith:
24            - '\TrolleyExpress.exe'  # Citrix
25            - '\ProcessDump.exe'     # Cisco Jabber
26            - '\dump64.exe'          # Visual Studio
27        GrantedAccess|endswith:
28            - '10'
29            - '30'
30            - '50'
31            - '70'
32            - '90'
33            - 'B0'
34            - 'D0'
35            - 'F0'
36            - '18'
37            - '38'
38            - '58'
39            - '78'
40            - '98'
41            - 'B8'
42            - 'D8'
43            - 'F8'
44            - '1A'
45            - '3A'
46            - '5A'
47            - '7A'
48            - '9A'
49            - 'BA'
50            - 'DA'
51            - 'FA'
52            - '0x14C2'  # https://github.com/b4rtik/ATPMiniDump/blob/76304f93b390af3bb66e4f451ca16562a479bdc9/ATPMiniDump/ATPMiniDump.c
53            - 'FF'
54    condition: selection
55falsepositives:
56    - Unknown
57level: high

References

  • Something went wrong, but don’t fret — let’s give it another shot.


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  • Dumping Lsass Without Mimikatz | Red Team Notes

    Dumping Lsass Without Mimikatz MiniDumpWriteDump API See my notes about writing a simple custom process dumper using MiniDumpWriteDump API: pageDumping Lsass without Mimikatz with MiniDumpWriteDump...


    Read More

  • Something went wrong, but don’t fret — let’s give it another shot.


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