Fake Canada Post Spam campaign leads to Trojan (Jan 20, 2012)

The Sonicwall UTM research team received reports of a new Spam compaign purported to come from Canada Post Corporation. The Trojan spreads by using an email that attempts to trick the user into downloading a delivery status PDF file.

Below is a screenshot of the email:

The email provides fake canada post URLs, one of which leads to the download of the Trojan www.magya{removed}.net/trkEE710410485CN.pif

Once downloaded and run, the Trojan injects code into C:WINDOWSSystem32wuauclt.exe and runs it.

The Trojan adds the following files to the filesystem:

C:Documents and SettingsAll UsersLocal SettingsTempeldf1dff000f1071.exe
C:Documents and Settings{USER}Local SettingsTemp0114714.tmp

The Trojan adds the following key to the windows registry to enable startup after reboot:

HKEY_LOCAL_MACHINEsoftwaremicrosoftwindowscurrentversionpoliciesexplorerrun "C:Documents and SettingsAll UsersLocal SettingsTempeldf1dff000f1071.exe"

The Trojan makes the following DNS requests:

www.goo{removed}n.net
www.poli{removed}

The Trojan was observed posting potentially sensitive encrypted system information to a remote web server:

The Trojan was also observed making the following request to download additional malware from a remote web server:

The downloaded file mYhY8A9.exe is saved as: C:Documents and Settings{USER}Local SettingsTemp0114714.tmp

SonicWALL Gateway AntiVirus provides protection against this threat via the following signatures:

GAV: Injector.NDP (Trojan)
GAV: Injector.NDP_2 (Trojan)
GAV: Injector.NDP_3 (Trojan)
GAV: Injector.NDP_4 (Trojan)
GAV: Injector.NDP_6 (Trojan)
GAV: Injector.KLH (Trojan)

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The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.