BKDR_INJECT.SMP
VirTool:Win32/Injector.gen!BQ (Microsoft); Generic Malware.bb!ats (McAfee); Backdoor.Win32.Shiz.raj (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Gen:Variant.Kazy.34430 (FSecure)
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Backdoor
Destructiveness: No
Encrypted:
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
235,600 bytes
EXE
Yes
17 Apr 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\fsamyx.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\fsamyx.exe,"
(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)
Other System Modifications
This backdoor deletes the following files:
- %User Temp%\1.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.)
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
f0bdff95 = "{random characters}"
It deletes the following registry keys:
_CHAR(0x10)_??????????_CHAR(0x10)__CHAR(0x12)__CHAR(0x12)_????????_CHAR(0x10)_??_CHAR(0x12)_???_CHAR(0x12)_???????_CHAR(0x10)_???????_CHAR(0x12)_?_CHAR(0x02)_?????
Dropping Routine
This backdoor drops the following files:
- %Windows%\apppatch\fsamyx.exe
- %Temp%\7.tmp
- %Temp%\3.tmp
- %Temp%\4.tmp
- %Temp%\6.tmp
- %Temp%\C.tmp
- %Temp%\10.tmp
- %Temp%\11.tmp
- %Temp%\15.tmp
- %Temp%\16.tmp
- %Temp%\19.tmp
- %Temp%\1A.tmp
- %Temp%\1B.tmp
- %Temp%\1C.tmp
- %Temp%\21.tmp
- %Temp%\1F.tmp
- %Temp%\D.tmp
(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}r.com/login.php
- http://{BLOCKED}m.com/login.php
- http://{BLOCKED}s.com/login.php
- http://{BLOCKED}l.com/login.php
- http://{BLOCKED}b.com/login.php
- http://{BLOCKED}x.com/login.php
- http://{BLOCKED}g.com/login.php
- http://{BLOCKED}p.com/login.php
- http://{BLOCKED}c.com/login.php
- http://{BLOCKED}f.com/login.php
- http://{BLOCKED}j.com/login.php
- http://{BLOCKED}w.com/login.php
- http://{BLOCKED}h.com/login.php
- http://{BLOCKED}z.com/login.php
- http://{BLOCKED}v.com/login.php
This report is generated via an automated analysis system.
SOLUTION
9.200
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_INJECT.SMP using either the Startup Disk or Recovery Console
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 NT\CurrentVersion\Winlogon
- f0bdff95 = "{random characters}"
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out 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\fsamyx.exe,"
To: userinit = ""%Windows%\system32\userinit.exe,""
- From: userinit = "%System%\userinit.exe,%Windows%\apppatch\fsamyx.exe,"
Step 5
Search and delete these components
- %Windows%\apppatch\fsamyx.exe
- %Temp%\7.tmp
- %Temp%\3.tmp
- %Temp%\4.tmp
- %Temp%\6.tmp
- %Temp%\C.tmp
- %Temp%\10.tmp
- %Temp%\11.tmp
- %Temp%\15.tmp
- %Temp%\16.tmp
- %Temp%\19.tmp
- %Temp%\1A.tmp
- %Temp%\1B.tmp
- %Temp%\1C.tmp
- %Temp%\21.tmp
- %Temp%\1F.tmp
- %Temp%\D.tmp
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_INJECT.SMP. 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%\1.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
Step 8
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In
- _CHAR(0x10)_??????????_CHAR(0x10)__CHAR(0x12)__CHAR(0x12)_????????_CHAR(0x10)_??_CHAR(0x12)_???_CHAR(0x12)_???????_CHAR(0x10)_???????_CHAR(0x12)_?_CHAR(0x02)_?????
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