TROJ_MEGYA.A
Trojan:Win32/Sinis.C, HackTool:Win32/Keygen (Microsoft); [2.nsis]:Generic BackDoor.ti, [4.nsis]:Generic KeyGen. (McAfee); Trojan.ADH (Symantec); ARC:NSIS, ARC:[data0002]:NSIS, [data0002/data0001]:Trojan-Dropper.Win32.NSIS.ve, PAK:[data0002/data0 (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Dropped:Trojan.Generic.5598591 (FSecure)
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
770,954 bytes
EXE
Yes
07 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.
Installation
This Trojan creates the following folders:
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %Program Files%\Common Files
- %Program Files%\Common Files\Microsoft Shared
- %Program Files%\Common Files\Microsoft Shared\Web Components
- %User Temp%\nsv3.tmp
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
jkss.exe = "%Program Files%\Common Files\Microsoft Shared\Web Components\jkss.exe"
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsd1.tmp
- %User Temp%\nsa2.tmp
- %User Temp%\nsv3.tmp
(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.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\svchost.exe
- %User Temp%\hosts
- %User Temp%\AAC2010_Keygen-64bits.exe
- %Program Files%\jkss.exe
- %User Temp%\nsv3.tmp\NSISArray.dll
- %User Temp%\nsv3.tmp\NSISdl.dll
- %User Temp%\Microsoft Visual C++ 2010 Redistributable Package.txt
- %User Temp%\nsv3.tmp\blowfish.dll
- %Program Files%\setup01.cab
- %Program Files%\bfw.exe
- %Program Files%\setup_.cab
(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}yltd.net/html/license_43EC922A3D0E1F403834E5456BAC1A12683D6F6CE3D7CF5C5B42E32E9B504B752F1741098BD8D605E4C1D8B64990528D3E21F4805B031E3609A4E5815B41D93262C32829119C74593BB07584AE629155AFAAD023EDF983A90F585277BA50F3F89B5A36DE2ED589C16E04B906E24EDB1DA66119B6089B65E6CE
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 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\CurrentVersion\Run
- jkss.exe="%Program Files%\Common Files\Microsoft Shared\Web Components\jkss.exe"
Step 4
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %Program Files%\Common Files
- %Program Files%\Common Files\Microsoft Shared
- %Program Files%\Common Files\Microsoft Shared\Web Components
- %User Temp%\nsv3.tmp
Step 5
Search and delete these files
- %User Temp%\svchost.exe
- %User Temp%\hosts
- %User Temp%\AAC2010_Keygen-64bits.exe
- %Program Files%\jkss.exe
- %User Temp%\nsv3.tmp\NSISArray.dll
- %User Temp%\nsv3.tmp\NSISdl.dll
- %User Temp%\Microsoft Visual C++ 2010 Redistributable Package.txt
- %User Temp%\nsv3.tmp\blowfish.dll
- %Program Files%\setup01.cab
- %Program Files%\bfw.exe
- %Program Files%\setup_.cab
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_MEGYA.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.
Step 7
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.
- %User Temp%\nsd1.tmp
- %User Temp%\nsa2.tmp
- %User Temp%\nsv3.tmp
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