Parcim Trojan steals sensitive system information (March 6, 2014)

The Dell Sonicwall Threats Research team have discovered an info stealer Trojan that is dropped onto unpatched machines as part of a drive-by-attack. The attack uses the CVE-2014-0502 vulnerability which has been covered recently in a previous SonicAlert.

Infection Cycle:

The Trojan adds the following files to the filesystem:

• %TEMP%chrome_frame_helper.dll [Detected as GAV: Parcim.A (Trojan)]
• %TEMP%chrome_frame_helper.exe
• %TEMP%chrome_frame_info.dll
• %TEMP%MSMAPI.OCX [Detected as GAV: Parcim.A_2 (Trojan)]
• %TEMP%YahooCache.ini
• %USERPROFILE%Local SettingsTemp$NtUninstallKB942388$ (contains stolen system information)

The Trojan adds the following key to the Windows registry:

• HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun chrome_update “%TEMP%chrome_frame_helper.exe”

The Trojan makes the following DNS query:

YahooCache.ini contains the following data:

The Trojan downloads an additional malicious file and saves it as MSMAPI.OCX [Detected as GAV: Parcim.A_2 (Trojan)]:

It runs MSMAPI.OCX using the following commandline:

rundll32 %TEMP%MSMAPI.OCX,RunProcGoa

The Trojan runs the following commands to gather system information:

cmd.exe /C ipconfig /all
cmd.exe /A /C rundll32 %TEMP%MSMAPI.OCX,RunProcGoA
cmd.exe /C net start
cmd.exe /C tasklist
cmd.exe /C systeminfo
cmd.exe /C netstat -an
cmd.exe /C net view
cmd.exe /C dir "%userprofile%recent"

$NtUninstallKB942388$ contains the following data derived from the commands above:

• Windows IP Configuration
• Data on configured network adaptors
• A list of running services
• Tasklist
• Output from netstat
• Number of processors
• Recently run .lnk files
• System info (OS version, processors, service pack, physical RAM etc.)

The stolen system information was observed being sent to a remote C&C server:

The Trojan periodically contacts the C&C server to announce its presence. It sends its internal IP address as the value for “&ClientId” and obtains its external IP address from the server:

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

• GAV: Parcim.A (Trojan)
• GAV: Parcim.A_2 (Trojan)

Security News

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.