RTKT_AVKILL.SM
Trojan:Win32/Killav.AO (Microsoft); [00000cf0.EXE]:ProcKill-EM (McAfee); Trojan.Dropper (Symantec); Trojan-Dropper.Win32.Small.edr (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan.KillAV.PZ (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 itself after execution.
TECHNICAL DETAILS
30,888 bytes
EXE
No
04 Nov 2012
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 creates the following folders:
- ¹¹¹¹eðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeÏiìiÝàA
Other System Modifications
This Trojan deletes the following files:
- ¹¹¹¹eðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeÏiìiÝàA\_CHAR(0x17)__CHAR(0x17)__CHAR(0x17)__CHAR(0x17)_èmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèm¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\6to4\Parameters
ServiceDll = "{random characters}"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\dll203.dll
- %System%\drivers\MgicRc.sys
- ¹¹¹¹eðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeÏiìiÝàA\_CHAR(0x17)__CHAR(0x17)__CHAR(0x17)__CHAR(0x17)_èmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèm¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other Details
This Trojan deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.300
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
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\6to4\Parameters
- From: ServiceDll = "{random characters}"
To: ServiceDll = ""{random values}""
- From: ServiceDll = "{random characters}"
Step 3
Search and delete these components
- %User Temp%\dll203.dll
- %System%\drivers\MgicRc.sys
- ¹¹¹¹eðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeÏiìiÝàA\_CHAR(0x17)__CHAR(0x17)__CHAR(0x17)__CHAR(0x17)_èmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèm¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹
Step 4
Search and delete this folder
- ¹¹¹¹eðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeÏiìiÝàA
Step 5
Scan your computer with your Trend Micro product to delete files detected as RTKT_AVKILL.SM. 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.
Step 6
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- ¹¹¹¹eðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeðeÏiìiÝàA\_CHAR(0x17)__CHAR(0x17)__CHAR(0x17)__CHAR(0x17)_èmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèmèm¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹¹
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
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