TROJ_KRYPTIK.SM5
TrojanDownloader:Win32/Renos.PG (Microsoft); Downloader-CEW.ak (McAfee); Trojan.Gen (Symantec); PAK:UPX (Kaspersky); Trojan.FakeAlert (Sunbelt); Trojan-Downloader:W32/Renos.GTR (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
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:
- {malware path and file name}.exe
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\_CHAR(0x03)_
HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Health\{8BF99520-548B-4AEB-BE1A-1F32A4A5C923}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
Vlu5 = 1cc9ba
HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
VluF = c1437d
HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
Vpa1 = "eYxK2YU091U0HrpsjvSIjxvXB02vD1zqtMMayT430jqjaaR30ZM5lXzmyQwo1BS9zX3f2jaiaA=="
HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
VluE = 1cc9ad8
HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
VluA = 49aa1b
Dropping Routine
This Trojan drops the following files:
- %Windows%\Tasks\{BBAEAEAF-1275-40e2-BD6C-BC8F88BD114A}.job
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
This report is generated via an automated analysis system.
SOLUTION
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
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_CURRENT_USER\Software
- NtWqIVLZEWZU
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones
- _CHAR(0x03)_
- In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Health
- {8BF99520-548B-4AEB-BE1A-1F32A4A5C923}
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\NtWqIVLZEWZU
- Vlu5=1cc9ba
- In HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
- VluF=c1437d
- In HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
- Vpa1="eYxK2YU091U0HrpsjvSIjxvXB02vD1zqtMMayT430jqjaaR30ZM5lXzmyQwo1BS9zX3f2jaiaA=="
- In HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
- VluE=1cc9ad8
- In HKEY_CURRENT_USER\Software\NtWqIVLZEWZU
- VluA=49aa1b
Step 4
Search and delete this file
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_KRYPTIK.SM5. 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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