TROJ_DYNAMER.LF
Trojan:Win32/Dynamer!ac (Microsoft); RDN/Downloader.a!qr (McAfee); Backdoor.Trojan (Symantec); Mal/PdfExDr-B (Sophos); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan horse SHeur4.BTQL (AVG)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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
32,768 bytes
EXE
Yes
23 May 2014
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 copies of itself into the affected system:
- %Program Files%\Windows NT\Yiwgggc.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It creates the following folders:
- %Program Files%\AppPatch
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Autostart Technique
This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wsaqqy kasocuck
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Wsaqqy kasocuck
DeleteFiles = "{malware path and file name}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Wsaqqy kasocuck
ConnectGroup = "ĬÈÏ·Ö×é"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Wsaqqy kasocuck
Description = "¼à²âºÍ¼àÊÓÐÂÓ²¼þÉ豸²¢×Ô¶¯¸üÐÂÉ豸Çý¶¯¡£"
Dropping Routine
This Trojan drops the following files:
- %Program Files%\AppPatch\NetSyst64.dll
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
This report is generated via an automated analysis system.
SOLUTION
9.700
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
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\SYSTEM\CurrentControlSet\Services
- Wsaqqy kasocuck
Step 4
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\SYSTEM\ControlSet001\Services\Wsaqqy kasocuck
- DeleteFiles = "{malware path and file name}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Wsaqqy kasocuck
- ConnectGroup = "ĬÈÏ·Ö×é"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Wsaqqy kasocuck
- Description = "¼à²âºÍ¼àÊÓÐÂÓ²¼þÉ豸²¢×Ô¶¯¸üÐÂÉ豸Çý¶¯¡£"
Step 5
Search and delete this file
- %Program Files%\AppPatch\NetSyst64.dll
Step 6
Search and delete this folder
- %Program Files%\AppPatch
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DYNAMER.LF. 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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