Nasreddine Bencherchali
95793d73bd
chore: update workflows and add quality of life updates and automation to the repository --------- Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>
32 lines
1.1 KiB
YAML
32 lines
1.1 KiB
YAML
title: Binary Padding - MacOS
|
|
id: 95361ce5-c891-4b0a-87ca-e24607884a96
|
|
status: test
|
|
description: Adversaries may use binary padding to add junk data and change the on-disk representation of malware. This rule detect using dd and truncate to add a junk data to file.
|
|
references:
|
|
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1027.001/T1027.001.md
|
|
- https://linux.die.net/man/1/truncate
|
|
- https://linux.die.net/man/1/dd
|
|
author: 'Igor Fits, Mikhail Larin, oscd.community'
|
|
date: 2020/10/19
|
|
modified: 2023/02/17
|
|
tags:
|
|
- attack.defense_evasion
|
|
- attack.t1027.001
|
|
logsource:
|
|
product: macos
|
|
category: process_creation
|
|
detection:
|
|
selection_truncate:
|
|
Image|endswith: '/truncate'
|
|
CommandLine|contains: '-s +'
|
|
selection_dd:
|
|
Image|endswith: '/dd'
|
|
CommandLine|contains:
|
|
- 'if=/dev/zero' # if input is not /dev/zero, then there is no null padding
|
|
- 'if=/dev/random' # high-quality random data
|
|
- 'if=/dev/urandom' # low-quality random data
|
|
condition: 1 of selection_*
|
|
falsepositives:
|
|
- Legitimate script work
|
|
level: high
|