BKDR_FARFLI.SMIA
Backdoor:Win32/Farfli.O (Microsoft); [000016b0.EXE]:BackDoor-CKB.gen.q (McAfee); Trojan.Farfli (Symantec); Backdoor.Win32.Agent.bhin (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); MemScan:Backdoor.Generic.613493 (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.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
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 creates the following folders:
- %Program Files%\Vqal
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Other System Modifications
This backdoor deletes the following files:
- %System%\syslog.dat
- %Program Files%\Vqal\Ammijgfjv.bmp
- %System Root%\Net-Temp.ini
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\326607845
HKEY_LOCAL_MACHINE\SOFTWARE\326607845\
Parameters
HKEY_LOCAL_MACHINE\SOFTWARE\123398766
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\326607845\
Parameters
ServiceDll = "%Program Files%\Vqal\Ammijgfjv.bmp"
HKEY_LOCAL_MACHINE\SOFTWARE\123398766
imgsvc = ""StiSvc,Eqpjuj Ejkmkedf Gqg""
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RouterManagers\
Ip
DLLPath = "%System Root%\2056900.dll"
(Note: The default value data of the said registry entry is %SystemRoot%\System32\iprtrmgr.dll.)
Dropping Routine
This backdoor drops the following files:
- %System Root%\2056900.dll
- %System Root%\NT_Path.jpg
- %Program Files%\Vqal\Ammijgfjv.bmp
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Other Details
This backdoor deletes the initially executed copy of itself
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_LOCAL_MACHINE\SOFTWARE
- 326607845
- In HKEY_LOCAL_MACHINE\SOFTWARE\326607845
- Parameters
- In HKEY_LOCAL_MACHINE\SOFTWARE
- 123398766
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\326607845\Parameters
- ServiceDll="%Program Files%\Vqal\Ammijgfjv.bmp"
- In HKEY_LOCAL_MACHINE\SOFTWARE\123398766
- imgsvc=""StiSvc,Eqpjuj Ejkmkedf Gqg""
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\SYSTEM\ControlSet001\Services\RemoteAccess\RouterManagers\Ip
- From: DLLPath="%System Root%\2056900.dll"
To: DLLPath=%SystemRoot%\System32\iprtrmgr.dll
- From: DLLPath="%System Root%\2056900.dll"
Step 5
Search and delete this folder
Step 6
Search and delete these components
- %System Root%\2056900.dll
- %System Root%\NT_Path.jpg
- %Program Files%\Vqal\Ammijgfjv.bmp
Step 7
Scan your computer with your Trend Micro product to delete files detected as BKDR_FARFLI.SMIA. 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 8
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.
- %System%\syslog.dat
- %Program Files%\Vqal\Ammijgfjv.bmp
- %System Root%\Net-Temp.ini
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