TROJ_KRYPTIK.MFV
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.
It deletes itself after execution.
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 creates the following folders:
- %User Profile%\Application Data\529C50B4000DF75B69AD74AD2830AC72
(Note: %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.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Version = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Name = "{malware file name}"
HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Id = "{malware file name}4fcfce780005e000"
HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
MostRecentStart = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Name = "529C50B4000DF75B69AD74AD2830AC72.EXE"
HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Id = "529C50B4000DF75B69AD74AD2830AC72.EXE4FCFCE780005E000"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\529C50B4000DF75B69AD74AD2830AC72\529C50B4000DF75B69AD74AD2830AC72
- %User Profile%\529C50B4000DF75B69AD74AD2830AC72\529C50B4000DF75B69AD74AD2830AC72.exe
(Note: %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.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}.173.15:65243/api/urls/?ts=c5b988be&affid=56300
- http://{BLOCKED}.173.15:65243/api/stats/install/?{random characters}
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
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
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\Microsoft\DirectInput\MostRecentApplication
- Version = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
- Name = "{malware file name}"
- In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
- Id = "{malware file name}4fcfce780005e000"
- In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
- MostRecentStart = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
- Name = "529C50B4000DF75B69AD74AD2830AC72.EXE"
- In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
- Id = "529C50B4000DF75B69AD74AD2830AC72.EXE4FCFCE780005E000"
Step 3
Search and delete these files
- %User Profile%\529C50B4000DF75B69AD74AD2830AC72\529C50B4000DF75B69AD74AD2830AC72
- %User Profile%\529C50B4000DF75B69AD74AD2830AC72\529C50B4000DF75B69AD74AD2830AC72.exe
Step 4
Search and delete this folder
- %User Profile%\Application Data\529C50B4000DF75B69AD74AD2830AC72
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_KRYPTIK.MFV. 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.
Did this description help? Tell us how we did.