BKDR_SHIZ.SMA
PWS:Win32/Simda.G (Microsoft), Backdoor.Win32.Shiz.raj (Kaspersky), W32/Shiz.RAJ!tr (Fortinet), Backdoor.Win32.Shiz (Ikarus), Win32/Spy.Shiz.NBX trojan (Eset),
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This backdoor 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
231,424 bytes
EXE
Yes
14 Mar 2012
Arrival Details
This backdoor 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 backdoor drops the following copies of itself into the affected system:
- %Windows%\AppPatch\{random}.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Autostart Technique
This backdoor modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe, %Windows%\apppatch\{random}.exe,"
(Note: The default value data of the said registry entry is "%System%\userinit.exe,".)
Other System Modifications
This backdoor adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
b0b2d6e3 = "{characters}"
It creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path}\{malware name}.exe = "{malware path}\{malware name}.exe:*:Enabled:Windows Explorer"
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}.com/login.php
SOLUTION
9.300
8.837.00
15 Mar 2012
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
Identify and delete files detected as BKDR_SHIZ.SMA using either the Startup Disk or Recovery Console
Step 3
Restore this modified 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 NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe, %Windows%\apppatch\{random}.exe,"
To: Userinit = "%System%\userinit.exe,"
- From: Userinit = "%System%\userinit.exe, %Windows%\apppatch\{random}.exe,"
Step 4
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 NT\CurrentVersion\Winlogon
- b0b2d6e3 = "{characters}"
- b0b2d6e3 = "{characters}"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path}\{malware name}.exe = "{malware path}\{malware name}.exe:*:Enabled:Windows Explorer"
- {malware path}\{malware name}.exe = "{malware path}\{malware name}.exe:*:Enabled:Windows Explorer"
Step 5
Scan your computer with your Trend Micro product to delete files detected as BKDR_SHIZ.SMA. 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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