TROJ_MDROP.ZYN
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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
479,232 bytes
PPS
24 Jan 2011
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan drops the following files:
- %User Profile%\UpBackup\UpdateOffice.exe
- %User Profile%\Application Data\Microsoft\Office\PowerP11.pip
- %User Profile%\PrintHood\UpdateOffice.exe
- %User Profile%\PrintHood\xdat.dll
- %User Profile%\PrintHood\{random characters}.PRI
- %User Profile%\PrintHood\{random characters}.dll
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
It creates the following folders:
- %User Profile%\UpBackup
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Common\
Internet
UseRWHlinkNavigation = "{malware path and filename}"
SOLUTION
9.200
7.790.12
24 Jan 2011
7.791.00
25 Jan 2011
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
Scan your computer with your Trend Micro product and note files detected as TROJ_MDROP.ZYN
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_CURRENT_USER\Software\Microsoft\Office\11.0\Common\Internet
- UseRWHlinkNavigation = "{malware path and filename}"
- UseRWHlinkNavigation = "{malware path and filename}"
Step 4
Search and delete these files
- %User Profile%\Application Data\Microsoft\Office\PowerP11.pip
- %User Profile%\PrintHood\UpdateOffice.exe
- %User Profile%\PrintHood\xdat.dll
- %User Profile%\PrintHood\{random characters}.PRI
- %User Profile%\PrintHood\{random characters}.dll
Step 5
Search and delete this folder
- %User Profile%\UpBackup
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROP.ZYN. 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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