TROJ_REDOSRU.DRP
Trojan:Win32/Redosdru.D (Microsoft); BackDoor-EMQ (McAfee); Trojan Horse (Symantec); Backdoor.Win32.ZZSlash.cer (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.2477660 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
458,184 bytes
EXE
Yes
10 Nov 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.
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\.Net CLR\Parameters
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
.Net CLR = "".Net CLR,_CHAR(0x14)_?_CHAR(0x12)_2088763392,???208876334194304,?????_CHAR(0x12)_""
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\.Net CLR\Parameters
ServiceDll = "%System%\96c1.dll"
Dropping Routine
This Trojan drops the following files:
- %System%\96c1.dll
(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.)
Other Details
This Trojan deletes the initially executed copy of itself
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
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\.Net CLR
- Parameters
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\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
- .Net CLR="".Net CLR,_CHAR(0x14)_?_CHAR(0x12)_2088763392,???208876334194304,?????_CHAR(0x12)_""
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\.Net CLR\Parameters
- ServiceDll="%System%\96c1.dll"
Step 5
Search and delete this file
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_REDOSRU.DRP. 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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