TROJ_KRYPTIK.SM7
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.
It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.
TECHNICAL DETAILS
Varies
UPX
Yes
17 Mar 2011
Arrival Details
This Trojan may be downloaded by other malware/grayware/spyware from remote sites.
It may be dropped by other malware.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This Trojan drops the following files:
- %Windows%\Tasks\{62C40AA6-4406-467a-A5A5-DFDF1B559B7A}.job
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It drops the following copies of itself into the affected system:
- %Windows%\Cgowua.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Global\{C814BC71-BD20-47f7-8107-9BCB142C6F1C}
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\2SPI9KEA4C
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\2SPI9KEA4C
CfiD = dword:00000005
HKEY_CURRENT_USER\Software\2SPI9KEA4C
Cfi3 = dword:01cbe836
HKEY_CURRENT_USER\Software\2SPI9KEA4C
CfiE = dword:b43f5ac0
HKEY_CURRENT_USER\Software\2SPI9KEA4C
Cku2 = {encrypted data}
HKEY_CURRENT_USER\Software\2SPI9KEA4C
CfiK = dword:00000679
HKEY_CURRENT_USER\Software\2SPI9KEA4C
Cfi2 = dword:00000001
HKEY_CURRENT_USER\Software\2SPI9KEA4C
CfiE3 = dword:00000001
HKEY_CURRENT_USER\Software\2SPI9KEA4C
CfiE3 = dword:00000001
HKEY_CURRENT_USER\Software\2SPI9KEA4C
Cku9 = {encrypted data}
HKEY_CURRENT_USER\Software\2SPI9KEA4C
Cku4 = {encrypted data}
SOLUTION
8.900
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
Terminate a process file/s detected as TROJ_KRYPTIK.SM7
*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.
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\2SPI9KEA4C
- CfiD = dword:00000005
- CfiD = dword:00000005
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- Cfi3 = dword:01cbe836
- Cfi3 = dword:01cbe836
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- CfiE = dword:b43f5ac0
- CfiE = dword:b43f5ac0
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- Cku2 = {encrypted data}
- Cku2 = {encrypted data}
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- CfiK = dword:00000679
- CfiK = dword:00000679
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- Cfi2 = dword:00000001
- Cfi2 = dword:00000001
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- CfiE3 = dword:00000001
- CfiE3 = dword:00000001
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- CfiE3 = dword:00000001
- CfiE3 = dword:00000001
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- Cku9 = {encrypted data}
- Cku9 = {encrypted data}
- In HKEY_CURRENT_USER\Software\2SPI9KEA4C
- Cku4 = {encrypted data}
- Cku4 = {encrypted data}
Step 4
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\
- 2SPI9KEA4C
- 2SPI9KEA4C
Step 5
Search and delete this file
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_KRYPTIK.SM7. 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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