Nasreddine Bencherchali
2cb7375c6b
update: Cred Dump Tools Dropped Files - Add procdump.exe and procdump64a.exe update: File Download From Browser Process Via Inline URL - Enhance selection by splitting CLI markers for better matching update: Tor Client/Browser Execution - Add additional PE metadata markers update: System Information Discovery via Registry Queries - Enhance registry markers update: PUA - AdFind Suspicious Execution - Add -sc to dclist string for more accurate coverage. fix: Removal Of Index Value to Hide Schedule Task - Registry - Remove EventType condition that broke the rule. fix: Removal Of SD Value to Hide Schedule Task - Registry - Remove EventType condition that broke the rule. fix: Creation of a Local Hidden User Account by Registry - Fix the TargetObject value fix: Potential Persistence Via New AMSI Providers - Registry - Change logsource and fix the rule logic fix: Potential COM Object Hijacking Via TreatAs Subkey - Registry - Change logsource and fix the rule logic fix: Potential Persistence Via Logon Scripts - Registry - Fix incorrect logsource fix: PUA - Sysinternal Tool Execution - Registry - Fix incorrect logsource fix: Suspicious Execution Of Renamed Sysinternals Tools - Registry - Fix incorrect logsource fix: PUA - Sysinternals Tools Execution - Registry - Fix incorrect logsource chore: add CI script for regression chore: add regression data --------- Co-authored-by: swachchhanda000 <87493836+swachchhanda000@users.noreply.github.com> Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>
29 lines
1.3 KiB
YAML
29 lines
1.3 KiB
YAML
title: File Encoded To Base64 Via Certutil.EXE
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id: e62a9f0c-ca1e-46b2-85d5-a6da77f86d1a
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status: test
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description: Detects the execution of certutil with the "encode" flag to encode a file to base64. This can be abused by threat actors and attackers for data exfiltration
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references:
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- https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/certutil
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- https://unit42.paloaltonetworks.com/new-babyshark-malware-targets-u-s-national-security-think-tanks/
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- https://lolbas-project.github.io/lolbas/Binaries/Certutil/
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author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro, oscd.community, Nasreddine Bencherchali (Nextron Systems)
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date: 2019-02-24
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modified: 2024-03-05
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tags:
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- attack.defense-evasion
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- attack.t1027
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logsource:
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category: process_creation
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product: windows
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detection:
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selection_img:
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- Image|endswith: '\certutil.exe'
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- OriginalFileName: 'CertUtil.exe'
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selection_cli:
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CommandLine|contains|windash: '-encode'
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condition: all of selection_*
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falsepositives:
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- As this is a general purpose rule, legitimate usage of the encode functionality will trigger some false positives. Apply additional filters accordingly
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level: medium
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regression_tests_path: regression_data/windows/process_creation/proc_creation_win_certutil_encode/info.yml
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