blue-team-tools/rules/windows/process_access/sysmon_malware_verclsid_shellcode.yml

title: Malware Shellcode in Verclsid Target Process
id: b7967e22-3d7e-409b-9ed5-cdae3f9243a1
status: test
description: Detects a process access to verclsid.exe that injects shellcode from a Microsoft Office application / VBA macro
author: John Lambert (tech), Florian Roth (rule)
references:
  - https://twitter.com/JohnLaTwC/status/837743453039534080
date: 2017/03/04
modified: 2021/11/27
logsource:
  category: process_access
  product: windows
  definition: 'Use the following config to generate the necessary Event ID 10 Process Access events: <ProcessAccess onmatch="include"><CallTrace condition="contains">VBE7.DLL</CallTrace></ProcessAccess><ProcessAccess onmatch="exclude"><CallTrace condition="excludes">UNKNOWN</CallTrace></ProcessAccess>'
detection:
  selection:
    TargetImage|endswith: '\verclsid.exe'
    GrantedAccess: '0x1FFFFF'
  combination1:
    CallTrace|contains|all:
      - '|UNKNOWN('
      - 'VBE7.DLL'
  combination2:
    SourceImage|contains: '\Microsoft Office\'
    CallTrace|contains: '|UNKNOWN'
  condition: selection and 1 of combination*
falsepositives:
  - unknown
level: high
tags:
  - attack.defense_evasion
  - attack.privilege_escalation
  - attack.t1055