HackTool - CobaltStrike BOF Injection Pattern

Severity: high
Author: Christian Burkard (Nextron Systems)
Source: upstream

Detects a typical pattern of a CobaltStrike BOF which inject into other processes

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1106` Native API
Defense Evasion	`T1562.001` Impair Defenses: Disable or Modify Tools

Event coverage

Provider	Event ID	Title
Sysmon	10	ProcessAccess

Stages and Predicates

Stage 1: `selection`

GrantedAccess: [0x1028, 0x1fffff]
CallTrace|re: '^C:\\Windows\\SYSTEM32\\ntdll\.dll\+[a-z0-9]{4,6}\|C:\\Windows\\System32\\KERNELBASE\.dll\+[a-z0-9]{4,6}\|UNKNOWN\([A-Z0-9]{16}\)$'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.