[Signature: MALWARE-OTHER HTTP POST request to a GIF file] Possible false positive

[Anshuman Anil Deshmukh <anshuman () cybage com>]

Hi,

We see lots of alerts with signature "MALWARE-OTHER HTTP POST" request to a GIF file. We believe this is possibly a 
false positive as all the requests are going to a legitimate website msn.com.

I am positing here the payload data for two of such alerts (One from a Windows system and other from a Linux system).

Kindly check.

Payload for Windows System:
0000000: 50 4f 53 54 20 2f 63 2e 67 69 66 3f 20   48 54 54 50 2f 31 2e 31 0d 0a 41 63 63  POST./c.gif?.HTTP/1.1..Acc
000001A: 65 70 74 3a 20 2a 2f 2a 0d 0a 43 6f 6e   74 65 6e 74 2d 54 79 70 65 3a 20 61 70  ept:.*/*..Content-Type:.ap
0000034: 70 6c 69 63 61 74 69 6f 6e 2f 6a 73 6f   6e 3b 20 63 68 61 72 73 65 74 3d 75 74  plication/json;.charset=ut
000004E: 66 2d 38 0d 0a 52 65 66 65 72 65 72 3a   20 68 74 74 70 3a 2f 2f 77 77 77 2e 6d  f-8..Referer:.http://www.m
0000068: 73 6e 2e 63 6f 6d 2f 65 6e 2d 69 6e 2f   3f 6f 63 69 64 3d 69 65 68 70 26 41 52  sn.com/en-in/?ocid=iehp&AR
0000082: 3d 34 0d 0a 41 63 63 65 70 74 2d 4c 61   6e 67 75 61 67 65 3a 20 65 6e 2d 55 53  =4..Accept-Language:.en-US
000009C: 2c 65 6e 3b 71 3d 30 2e 35 0d 0a 4f 72   69 67 69 6e 3a 20 68 74 74 70 3a 2f 2f  ,en;q=0.5..Origin:.http://
00000B6: 77 77 77 2e 6d 73 6e 2e 63 6f 6d 0d 0a   41 63 63 65 70 74 2d 45 6e 63 6f 64 69  www.msn.com..Accept-Encodi
00000D0: 6e 67 3a 20 67 7a 69 70 2c 20 64 65 66   6c 61 74 65 0d 0a 55 73 65 72 2d 41 67  ng:.gzip,.deflate..User-Ag
00000EA: 65 6e 74 3a 20 4d 6f 7a 69 6c 6c 61 2f   35 2e 30 20 28 57 69 6e 64 6f 77 73 20  ent:.Mozilla/5.0.(Windows.
0000104: 4e 54 20 36 2e 33 3b 20 57 4f 57 36 34   3b 20 54 72 69 64 65 6e 74 2f 37 2e 30  NT.6.3;.WOW64;.Trident/7.0
000011E: 3b 20 72 76 3a 31 31 2e 30 29 20 6c 69   6b 65 20 47 65 63 6b 6f 0d 0a 48 6f 73  ;.rv:11.0).like.Gecko..Hos
0000138: 74 3a 20 6f 74 66 2e 6d 73 6e 2e 63 6f   6d 0d 0a 43 6f 6e 74 65 6e 74 2d 4c 65  t:.otf.msn.com..Content-Le
0000152: 6e 67 74 68 3a 20 34 36 37 0d 0a 44 4e   54 3a 20 31 0d 0a 43 6f 6e 6e 65 63 74  ngth:.467..DNT:.1..Connect
000016C: 69 6f 6e 3a 20 4b 65 65 70 2d 41 6c 69   76 65 0d 0a 43 61 63 68 65 2d 43 6f 6e  ion:.Keep-Alive..Cache-Con
0000186: 74 72 6f 6c 3a 20 6e 6f 2d 63 61 63 68   65 0d 0a 0d 0a                          trol:.no-cache....

Payload for Linux System:

0000000: 50 4f 53 54 20 2f 63 2e 67 69 66 3f 20   48 54 54 50 2f 31 2e 31 0d 0a 48 6f 73  POST./c.gif?.HTTP/1.1..Hos

000001A: 74 3a 20 6f 74 66 2e 6d 73 6e 2e 63 6f   6d 0d 0a 43 6f 6e 6e 65 63 74 69 6f 6e  t:.otf.msn.com..Connection

0000034: 3a 20 6b 65 65 70 2d 61 6c 69 76 65 0d   0a 43 6f 6e 74 65 6e 74 2d 4c 65 6e 67  :.keep-alive..Content-Leng

000004E: 74 68 3a 20 35 30 36 36 0d 0a 4f 72 69   67 69 6e 3a 20 68 74 74 70 3a 2f 2f 77  th:.5066..Origin:.http://w

0000068: 77 77 2e 6d 73 6e 2e 63 6f 6d 0d 0a 55   73 65 72 2d 41 67 65 6e 74 3a 20 4d 6f  ww.msn.com..User-Agent:.Mo

0000082: 7a 69 6c 6c 61 2f 35 2e 30 20 28 58 31   31 3b 20 4c 69 6e 75 78 20 78 38 36 5f  zilla/5.0.(X11;.Linux.x86_

000009C: 36 34 29 20 41 70 70 6c 65 57 65 62 4b   69 74 2f 35 33 37 2e 33 36 20 28 4b 48  64).AppleWebKit/537.36.(KH

00000B6: 54 4d 4c 2c 20 6c 69 6b 65 20 47 65 63   6b 6f 29 20 43 68 72 6f 6d 65 2f 34 33  TML,.like.Gecko).Chrome/43

00000D0: 2e 30 2e 32 33 35 37 2e 31 33 30 20 53   61 66 61 72 69 2f 35 33 37 2e 33 36 0d  .0.2357.130.Safari/537.36.

00000EA: 0a 43 6f 6e 74 65 6e 74 2d 74 79 70 65   3a 20 61 70 70 6c 69 63 61 74 69 6f 6e  .Content-type:.application

0000104: 2f 6a 73 6f 6e 3b 20 63 68 61 72 73 65   74 3d 55 54 46 2d 38 0d 0a 41 63 63 65  /json;.charset=UTF-8..Acce

000011E: 70 74 3a 20 2a 2f 2a 0d 0a 52 65 66 65   72 65 72 3a 20 68 74 74 70 3a 2f 2f 77  pt:.*/*..Referer:.http://w

0000138: 77 77 2e 6d 73 6e 2e 63 6f 6d 2f 65 6e   2d 69 6e 2f 6e 65 77 73 2f 70 68 6f 74  ww.msn.com/en-in/news/phot

0000152: 6f 73 2f 70 69 63 74 75 72 65 73 2d 6f   66 2d 74 68 65 2d 77 65 65 6b 2d 6a 75  os/pictures-of-the-week-ju

000016C: 6c 79 2d 32 34 2d 32 30 31 35 2f 73 73   2d 41 41 64 70 44 66 33 0d 0a 41 63 63  ly-24-2015/ss-AAdpDf3..Acc

0000186: 65 70 74 2d 45 6e 63 6f 64 69 6e 67 3a   20 67 7a 69 70 2c 20 64 65 66 6c 61 74  ept-Encoding:.gzip,.deflat

00001A0: 65 0d 0a 41 63 63 65 70 74 2d 4c 61 6e   67 75 61 67 65 3a 20 65 6e 2d 55 53 2c  e..Accept-Language:.en-US,

00001BA: 65 6e 3b 71 3d 30 2e 38 0d 0a 0d 0a                                              en;q=0.8....


Regards,
Anshuman Anil Deshmukh | Sr. IS Analyst - Security
Cybage Software Pvt. Ltd. (An ISO 27001 company)
Phone : 91-20-66041700, 91-20-66044700 (Ext. 6114)
Fax: 91-20-66041701 & 66041702
Cell: 91-99230-51641




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