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February 12, 2023

New Amazon Linux Triage Detection

by John Lukach

Likelihood

MMI detects if a sha256 hash, full path, or filename commonly occurs if found on five or more Amazon Machine Images (AMIs) for Amazon Linux. It helps identify files that potentially allow the opportunity to hide in plain sight. The common.bloom file contains 1,057,452 of 5,369481 total values.

https://github.com/jblukach/mmi

The mmi.bloom file contains 1,941,059 values that only occur on a single AMI used when determining the quantity to qualify the likelihood.

Self-Service

Having all the data in the world doesn’t do any good if there isn’t a way to use it. I have provided an API available for FREE to use in your incident response automation by providing the last updated timestamp with a filename containing the SHA256 hash to verify the downloaded zip file’s integrity from the returned access link.

https://store.lukach.io


import requests

key = ''
url = 'https://sha256.lukach.io/unique' # https://sha256.lukach.io/hashes

headers = {'x-api-key': key}

r = requests.get(url, headers = headers)

output = r.json()

d = requests.get(output['link'])

if d.status_code == 200:
    with open(output['filename'], 'wb') as f:
        f.write(d.content)

tags: Amazon - AWS - Linux - Meta - SHA256