info_macho_control_flow
YARA-2023-0210
Low
general
Active
Identify macho's that have irregular control flow with initializers or terminators using the macho-module
info_macho_control_flow.yar
Valid Syntax
import "macho"
rule info_macho_control_flow
{
meta:
description = "Identify macho's that have irregular control flow with initializers or terminators using the macho-module"
author = "@shellcromancer"
version = "1.0"
date = "2023.01.27"
sample = "af7c395426649c57e44eac0bb6c6a109ac649763065ff5b2b23db71839bac655"
reference = "https://github.com/aidansteele/osx-abi-macho-file-format-reference#table-2-the-sections-of-a__datasegment"
reference = "https://twitter.com/greglesnewich/status/1618758795743866881"
DaysofYARA = "27/100"
condition:
for any seg in macho.segments : (
seg.segname == "__DATA" and
for any sect in seg.sections : (
(
sect.sectname == "__mod_init_func" or
sect.sectname == "__mod_term_func"
)
)
)
}
Rule Metadata
description
Identify macho's that have irregular control flow with initializers or terminators using the macho-module
author
@shellcromancer
version
1.0
date
2023.01.27
sample
af7c395426649c57e44eac0bb6c6a109ac649763065ff5b2b23db71839bac655
reference
https://twitter.com/greglesnewich/status/1618758795743866881
DaysofYARA
27/100
Threat Analysis
This YARA rule is designed to detect general threats.
Severity Level: Low
The rule uses pattern matching to identify specific byte sequences, strings, or behavioral patterns associated with malicious activity.
Detection Capabilities
- File-based detection for executables and documents
- Memory scanning for running processes
- Network traffic analysis support
Command Line Usage
# Scan a single file yara info_macho_control_flow.yar /path/to/suspicious/file # Scan a directory recursively yara -r info_macho_control_flow.yar /path/to/directory/ # Scan with metadata output yara -m info_macho_control_flow.yar target_file # Scan process memory (Linux) yara info_macho_control_flow.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='info_macho_control_flow.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=info_macho_control_flow.yar /path/to/scan
Rule Information
YARA ID
YARA-2023-0210
Author
Repository
Created
August 19, 2025
Last Updated
August 19, 2025
Last Imported
Never
Threat Intelligence
Risk Level
Low
Category
general
Detection Confidence
Analysis Pending
False Positive Rate
Not Available
Last Seen in Wild
No Data
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