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January 8, 2020 03:51
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SANS Holiday Hack 2019 Objective 5 - Determine Compromised System
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#!/use/bin/env python3 | |
# SANS Holiday Hack 2019 Objective 5 - Determine Compromised System | |
import dateutil.parser | |
from datetime import timedelta, datetime | |
from os import listdir | |
from os.path import isfile, join | |
import pprint | |
# target_time = dateutil.parser.parse('2019-11-19T12:21:35.327998') | |
# ten_mins_after = target_time + timedelta(minutes=10) | |
# ten_mins_prior = target_time + timedelta(minutes=-10) | |
tgt_dir = 'elfu-zeeklogs' | |
log_files = [ | |
f for f in listdir(tgt_dir) | |
if isfile(join(tgt_dir, f)) | |
and f.startswith('conn') | |
# and ten_mins_after > dateutil.parser.parse(f.split('_')[1][:-4]) > ten_mins_prior | |
] | |
parsed_logs = list() | |
for log in log_files: | |
with open(join(tgt_dir, log)) as f: | |
data = f.read().split('\n') | |
data = [d for d in data if '\t' in d and '#' not in d] | |
for row in data: | |
field_names = [ | |
'ts', 'uid', 'id.orig_h', 'id.orig_p', 'id.resp_h', 'id.resp_p', 'proto', 'service', 'duration', 'orig_bytes','conn_state', | |
'local_orig', 'local_resp', 'missed_bytes', 'history', 'orig_pkts', 'orig_ip_bytes', 'resp_pkts', 'resp_ip_bytes', 'tunnel_parents' | |
] | |
#types: time string addr port addr port enum string interval count count | |
# string bool bool count string count count count count set[string] | |
parsed_logs.append(dict(zip(field_names, row.split('\t')))) | |
focus = [l for l in parsed_logs if int(l['id.orig_p']) == 4444 or int(l['id.resp_p']) == 4444] | |
output = list() | |
for i in focus: | |
i['ts'] = datetime.utcfromtimestamp(int(i['ts'].split('.')[0])).isoformat() | |
output.append({k: v for (k,v) in i.items() if k in ['duration', 'id.orig_h', 'id.orig_p', 'id.resp_h', 'id.resp_p', 'ts']}) | |
output.sort(key=lambda x: x['duration']) | |
pprint.pprint(output) |
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Example output:
This was based on a hunch because I saw port 4444 earlier in Sysmon.
Unfortunately this didn't help me find the solution, but was fun nonetheless.