Created
July 26, 2018 16:41
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Deobfuscates Batch script in https://www.gdatasoftware.com/blog/2018/07/30924-g-data-analysis-discovers-dosfuscation-in-the-wild
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| import sys | |
| import re | |
| if len(sys.argv) <= 1: exit() | |
| scriptpath = sys.argv[1] | |
| with open(scriptpath, 'r') as scriptfile: | |
| script = scriptfile.read().replace('^', '') | |
| p = re.compile('\([Ss][Ee][Tt][^=]+=([^&]+)&&') | |
| s = p.search(script) | |
| if s != None: | |
| alphabet = s.group(1) | |
| script = re.sub(r'[,\+;]', '', script) | |
| p = re.compile('\(([0-9 ]+)\)') | |
| s = p.search(script) | |
| if s != None: | |
| indices = s.group(1).split() | |
| for i in indices: | |
| idx = int(i) | |
| if idx < len(alphabet): | |
| sys.stdout.write(alphabet[idx]) |
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Oh, my... I just found this today while looking for my own script by the same name. Here is my dynamic take on de-DOSfuscation, if you're interested :)
https://github.com/fireeye/flare-qdb/blob/master/flareqdb/scripts/deDOSfuscator.py
https://www.fireeye.com/blog/threat-research/2018/11/cmd-and-conquer-de-dosfuscation-with-flare-qdb.html