Exemplo de Analise e Regra

Caros,

Estou postando aqui uma análise BEM básica mas acredito que seja um rascunho que podemos certamente melhorar .


File: Bradesco3.exe

Imagem Phishing: Quando recebe por email colocamos um screenshot aqui

Online Analysis:

http://anubis.iseclab.org/?action=result&task_id=1f292cd7c26bd99f4e1d6d24fb47ecf8a 
http://www.virustotal.com/analisis/abc8be44fddf6e2b22e760b5ea695182f8e4b9080201f47f7227be018b27f8be-1279631400

Part of TCP Traffic that rules were based
 
POST /banner_inc.php HTTP/1.1
Content-Length: 22
Host: www.shanhaiichiba.com
Accept: */*
Keep-Alive: 300
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
Content-Type: application/x-www-form-urlencoded
Connection: keep-alive

T=C&DADOS=PWD&NOME=pc2HTTP/1.1 200 OK
Date: Tue, 20 Jul 2010 13:02:02 GMT
Server: Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 mod_perl/2.0.4 Perl/v5.8.8
X-Powered-By: PHP/5.2.13
Content-Length: 0
Keep-Alive: timeout=30, max=100
Connection: Keep-Alive
Content-Type: text/html

Snort Rule
 
# Rule Created 20/07/2010
# Bradesco Plugin
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS  (msg:"Bradesco Malware Communication Detected (plugin.exe)"; flow:established; uricontent:"&DADOS=";http_client_body;content:"&NOME=";http_client_body; sid:100000000;rev:1; )

Simulation

07/20-10:02:03.221920  [**] [1:100000000:1] Bradesco Malware Communication Detected (plugin.exe) [**] [Priority: 0] {TCP} 192.168.0.2:1038 -> 74.81.93.227:80

07/20-10:02:03.221920 52:54:0:12:34:56 -> 92:27:FC:57:72:BB type:0x800 len:0x18A
192.168.0.2:1038 -> 74.81.93.227:80 TCP TTL:128 TOS:0x0 ID:1802 IpLen:20 DgmLen:380 DF
***AP*** Seq: 0xBA9DCDE7  Ack: 0xA208E838  Win: 0x4470  TcpLen: 20
50 4F 53 54 20 2F 62 61 6E 6E 65 72 5F 69 6E 63  POST /banner_inc
2E 70 68 70 20 48 54 54 50 2F 31 2E 31 0D 0A 43  .php HTTP/1.1..C
6F 6E 74 65 6E 74 2D 4C 65 6E 67 74 68 3A 20 32  ontent-Length: 2
32 0D 0A 48 6F 73 74 3A 20 77 77 77 2E 73 68 61  2..Host: www.sha
6E 68 61 69 69 63 68 69 62 61 2E 63 6F 6D 0D 0A  nhaiichiba.com..
41 63 63 65 70 74 3A 20 2A 2F 2A 0D 0A 4B 65 65  Accept: */*..Kee
70 2D 41 6C 69 76 65 3A 20 33 30 30 0D 0A 55 73  p-Alive: 300..Us
65 72 2D 41 67 65 6E 74 3A 20 4D 6F 7A 69 6C 6C  er-Agent: Mozill
61 2F 34 2E 30 20 28 63 6F 6D 70 61 74 69 62 6C  a/4.0 (compatibl
65 3B 20 4D 53 49 45 20 36 2E 30 3B 20 57 69 6E  e; MSIE 6.0; Win
64 6F 77 73 20 4E 54 20 35 2E 31 3B 20 53 56 31  dows NT 5.1; SV1
3B 20 2E 4E 45 54 20 43 4C 52 20 32 2E 30 2E 35  ; .NET CLR 2.0.5
30 37 32 37 3B 20 2E 4E 45 54 20 43 4C 52 20 33  0727; .NET CLR 3
2E 30 2E 30 34 35 30 36 2E 36 34 38 3B 20 2E 4E  .0.04506.648; .N
45 54 20 43 4C 52 20 33 2E 35 2E 32 31 30 32 32  ET CLR 3.5.21022
29 0D 0A 43 6F 6E 74 65 6E 74 2D 54 79 70 65 3A  )..Content-Type:
20 61 70 70 6C 69 63 61 74 69 6F 6E 2F 78 2D 77   application/x-w
77 77 2D 66 6F 72 6D 2D 75 72 6C 65 6E 63 6F 64  ww-form-urlencod
65 64 0D 0A 43 6F 6E 6E 65 63 74 69 6F 6E 3A 20  ed..Connection:
6B 65 65 70 2D 61 6C 69 76 65 0D 0A 0D 0A 54 3D  keep-alive....T=
43 26 44 41 44 4F 53 3D 50 57 44 26 4E 4F 4D 45  C&DADOS=PWD&NOME
3D 70 63 32                                      =pc2

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

Output performance (basic match using rule2alert) - in future 


Após isso podemos aguardar comentários e sugestões e depois adicionar ao malwares-br.rules .


O que acham ? O que podemos adicionar  ?


Happy Snorting!