A small feature in this new version: start the -E option value with # to count and group.
Example:
C:\Demo>zipdump.py -E “#%HEADASCII%;%HEADHEX%” Book1.xlsm
1: –…………..;d0cf11e0a1b11ae10000000000000000
1: <xml xmlns:v=”ur;3c786d6c20786d6c6e733a763d227572
12: <?xml version=”1;3c3f786d6c2076657273696f6e3d2231
zipdump_v0_0_5.zip (https)
MD5: 5F49895D3EA97A870ECB1E262A738A04
SHA256: E16CE5A426840D2804E5EF544CF334715F501D0892496D02B6C5000B18CE10BA
When I got this popup while moving a file from a Dropbox folder, I immediately thought Alternate Data Stream:
I ran my filescanner on the file, and found an ADS with name com.dropbox.attributes:
From the Magic HEX value, we can see that the content of the stream (frozen-sea-foam.mp4:com.dropbox.attributes) starts with 0x78 (and the streamsize is 83 bytes). 0x78 hints at zlib deflated data.
If you are not that familiar with magic values, you can use my file-magic tool:
Trying to decompress the ADS with translate.py gives us JSON data {“dropbox_fileid_local”: {“machineid_attr”: {“data”: “aa4xliox7z5n0qewxOlT3Q==”}}}:
The data field looks like BASE64, so let’s try to decode it with base64dump.py:
It decodes with BASE64 to data that looks random. From the names in the JSON data, we can deduce that this is probably a machine ID.
Remark 1: as it could well be my unique machine ID, I altered the value of the ID.
Remark 2: my file-magic.py tool is beta.
Remark 3: if you wonder what the video frozen-sea-foam is, I have it on Instragram.
I released this new version of FileScanner at the end of 2015, but forgot to announce it here on my blog.
This new version also scans Alternate Data Streams.
FileScanner_V0_0_0_4.zip (https)
MD5: 4BB8F475328B9EB214E6B9405F84816E
SHA256: 5D3B1408C5D2BD17C0441D0D9D0DA565E8D690DE792971092956F4CA10D5A071
This new version of byte-stats.py adds statistics for hexadecimal and base64 characters:
$byte-stats.py all.bin
Byte ASCII Count Pct
0x00 1 0.39%
0x01 1 0.39%
0x02 1 0.39%
0x03 1 0.39%
0x04 1 0.39%
...
0xfb 1 0.39%
0xfc 1 0.39%
0xfd 1 0.39%
0xfe 1 0.39%
0xff 1 0.39%
Size: 256
File(s)
Entropy: 8.000000
Unique bytes: 256 100.00%
NULL bytes: 1 0.39%
Control bytes: 27 10.55%
Whitespace bytes: 6 2.34%
Printable bytes: 94 36.72%
High bytes: 128 50.00%
Hexadecimal bytes: 22 8.59%
BASE64 bytes: 65 25.39%
byte-stats_V0_0_5.zip (https)
MD5: B79C6DF0964C9BA676D88E2085ACF037
SHA256: B9112274BD757FB3311883B0CF179ABDEC149C421EFEB335D70AF972495A5C20
Here is an overview of content I published in December:
Blog posts:
YouTube videos:
Videoblog posts:
SANS ISC Diary entries:
NVISO Labs blog posts:
Didier Stevens 