PE_SNOW.A
Virus:Win32/Snow.A (Microsoft); W32/Snow.a (McAfee); W32.Snow.A (Symantec); Trojan-Dropper.Win32.Agent.ajy (Kaspersky); Trojan.Generic.7392555 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: File infector
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
733,184 bytes
EXE
No
25 Apr 2012
Arrival Details
This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Other System Modifications
This file infector adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
A = "%Program Files%\VMware\VMware Tools\vmacthlp.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
B = "%Program Files%\Messenger\msmsgs.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
C = "{malware path and file name}"
HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
D = "%Program Files%\VMware\VMware Tools\vmtoolsd.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
E = "%Program Files%\VMware\VMware Tools\VMUpgradeHelper.exe"
Dropping Routine
This file infector drops the following files:
- %System%\drivers\npf.sys
- %Windows%\pthreadvc.dll
- %Windows%\packet.dll
- %Windows%\wpcap.dll
- %Windows%\CTFMON.EXE
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
This report is generated via an automated analysis system.
SOLUTION
9.200
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE
- SNOW
Step 3
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
- A = "%Program Files%\VMware\VMware Tools\vmacthlp.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
- B = "%Program Files%\Messenger\msmsgs.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
- C = "{malware path and file name}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
- D = "%Program Files%\VMware\VMware Tools\vmtoolsd.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\SNOW
- E = "%Program Files%\VMware\VMware Tools\VMUpgradeHelper.exe"
Step 4
Search and delete these files
- %System%\drivers\npf.sys
- %Windows%\pthreadvc.dll
- %Windows%\packet.dll
- %Windows%\wpcap.dll
- %Windows%\CTFMON.EXE
Step 5
Scan your computer with your Trend Micro product to clean files detected as PE_SNOW.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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