|
| 1 | +""" |
| 2 | + Time-Dependent DGA of Tempedreve |
| 3 | + -------------------------------- |
| 4 | + sample: https://www.virustotal.com/en/file/6d0f7460569993ffeedfb67514f50e1d93b7124e132f0de6bb3f57d00d779c9d/analysis/1493892364/ |
| 5 | + md5: a1310a8d9a6a51be4a6600a2be7ddab2 |
| 6 | +
|
| 7 | +
|
| 8 | + This DGA is very similar to the time-independent one described |
| 9 | + by Anubis Networks, see |
| 10 | + https://www.anubisnetworks.com/tempedreve-botnet-report |
| 11 | +""" |
| 12 | + |
| 13 | +import string |
| 14 | +import argparse |
| 15 | +from datetime import datetime, timedelta |
| 16 | + |
| 17 | +def rand(r): |
| 18 | + r = (16843009 * r) & 0xFFFFFFFF |
| 19 | + r = (r + 65805) & 0xFFFFFFFF |
| 20 | + return r |
| 21 | + |
| 22 | +def shuffle(letters, seed): |
| 23 | + r = seed; |
| 24 | + for j in range(len(letters)): |
| 25 | + i = r % len(letters) |
| 26 | + r = rand(r) |
| 27 | + letters[j], letters[i] = letters[i], letters[j] |
| 28 | + return letters |
| 29 | + |
| 30 | +def dga(d): |
| 31 | + enddate = datetime.strptime("2015-03-23", "%Y-%m-%d") |
| 32 | + while d >= enddate: |
| 33 | + days = days_since_unix_epoch(d) |
| 34 | + seed = (((1664525*days) & 0xFFFFFFFF) + 1013904223) & 0xFFFFFFFF |
| 35 | + tlds = ['.com', '.net', '.org', '.info'] |
| 36 | + letters = list(string.ascii_lowercase) |
| 37 | + letters = shuffle(letters, seed) |
| 38 | + length = seed % 5 + 7 |
| 39 | + domain = "" |
| 40 | + r = seed |
| 41 | + for i in range(length): |
| 42 | + domain += letters[r % len(letters)] |
| 43 | + r = rand(r) |
| 44 | + tld = tlds[seed & 3] |
| 45 | + domain += tld |
| 46 | + d -= timedelta(days=1) |
| 47 | + yield domain |
| 48 | + |
| 49 | +def days_since_unix_epoch(dt): |
| 50 | + return (dt - datetime(1970,1,1)).days |
| 51 | + |
| 52 | +if __name__=="__main__": |
| 53 | + parser = argparse.ArgumentParser() |
| 54 | + parser.add_argument("-d", "--date", help="date for which to generate domains") |
| 55 | + args = parser.parse_args() |
| 56 | + if args.date: |
| 57 | + d = datetime.strptime(args.date, "%Y-%m-%d") |
| 58 | + else: |
| 59 | + d = datetime.now() |
| 60 | + for domain in dga(d): |
| 61 | + print(domain) |
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