Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: Blackhole targeting Java vulnerability via fake Microsoft Services Agreement email phish - SANS Internet Storm Center SANS ISC InfoSec Forums


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Blackhole targeting Java vulnerability via fake Microsoft Services Agreement email phish

Thanks to Susan Bradley for reporting this to ISC.

We're receiving multiple reports of a phishing campaign using the template from a legitimate Microsoft email regarding Important Changes to Microsoft Services Agreement and Communication Preferences.

The legitimate version of this email is specific to a services agreement seen here, per a change to Microsoft services as of 27 AUG.

The evil version of this email will subject victim to a hyperlink that will send them to a Blackhole-compromised website, which will in turn deliver a fresh Zeus variant.

I'll walk you though the full sample set I analyzed. Susan sent us an email including the following header snippet:

Received: from [101.5.162.236] ([101.5.162.236])    by
 inbound94.exchangedefender.com (8.13.8/8.13.1) with ESMTP id q7VFDPjO029166

A legitimate header snippet:

Received: from smtpi.msn.com ([65.55.52.232]) by COL0-MC3-F43.Col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900)

101.5.162.236 is in China, 65.55.52.232 is Microsoft.

The legitimate email will include a hyperlink for http://email.microsoft.com/Key-9850301.C.DLs15.C.KK.DlNkNK, which points to the above mentioned services agreement.

Obfuscated to protect the innocent: The phishing mail will instead include a hyperlink to the likes of allseasons****.us, radiothat****.com, and likely a plethora of others. I assessed radiothat****.com and was redirected to 209.x.y.14 which is running the very latest Blackhole evil as described on 28 AUG by Websense in this post.

Source code review of the web page served included <applet/code="ndshesa.ndshesf"/archive="Leh.jar"><param/nam=123 name=uid value="N013:011:011:04:037:061:061:047:034:076:074:0102:076:074:047:047:047:074:067:053:061:04:074:04:013:04:075:054:071:034:067:053:034:034:02:065:071:034"/></applet>

The VirusTotal link for Leh.jar is here, and the VirusTotal link for the Zeus variant offered is here.

Recommendations:

  1. Hover over hyperlinks and ensure they are directing you to legitimate sites before clicking. Be cautious even thereafter.
  2. Contemplate disabling Java until the next update is released.
  3. Review email headers if in doubt for messages you receive that seem suspicious.
  4. Keep your antimalware signatures up to date. While limited at the moment, detection for both the Java exploit and the Zeus variant is increasing.

Ping us with questions or comments, as well as anything you'd like to share regarding similarly received emails from this phishing campaign.

Russ McRee | @holisticinfosec

 

 

 

 

 

Russ McRee

179 Posts
ISC Handler
Symantec Endpoint Protection is detecting this as Trojan.Maljava!Gen23. We've already seen the e-mail and had detections.
Alan

57 Posts
Saw two other instances in our proxy, still available:

303723b3cb0be491bf01d5fc48102b1a Leh.jar
d52a84424f07bd5b9604090c456049c0 Leh.jar.1
Jens

42 Posts
Two more checksums, still active;

100e28cd9412d2ebc6a57009ae910e72 Leh.jar.3
597a088fc59a0dfcce7a9305b8fc6adf Leh.jar.4
Jens

42 Posts

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