TROJ_INJECTOR.NP
VirTool:Win32/DelfInject.gen!X (Microsoft); Generic.dx!bcwt (McAfee); Backdoor.Graybird (Symantec); PAK:UPX (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Delf.Inject.Z (FSecure)
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.
TECHNICAL DETAILS
242,688 bytes
EXE
Yes
31 May 2012
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 drops the following copies of itself into the affected system:
- %System Root%\ProgramData\TuvjywK\CtlouiB\ElsxjvO.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following folders:
- %System Root%\ProgramData
- %System Root%\ProgramData\TuvjywK
- %System Root%\ProgramData\TuvjywK\OncfoyP
- %System Root%\ProgramData\TuvjywK\CtlouiB
- %System Root%\ProgramData\TuvjywK\RyunogB
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ElsxjvO = "%System Root%\ProgramData\TuvjywK\CtlouiB\ElsxjvO.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\sistemanet
It adds the following registry entries:
HKEY_CURRENT_USER\Software\sistemanet
direct = "jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjhdjaagjaahjaofjabajaaijge)"
HKEY_CURRENT_USER\Software\sistemanet
name1 = "jfijaohjaaejabojaofjaahjgi)"
HKEY_CURRENT_USER\Software\sistemanet
lugarjpg = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
dir2 = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
dir = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
l001 = "jaaf)"
HKEY_CURRENT_USER\Software\sistemanet
aviso = "jaaejaoejaoi)"
HKEY_CURRENT_USER\Software\sistemanet
data = "jdhjec)"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\CA\Certificates\
FE622EA7B33CA46519AB39736A66B8F6E41FF157
Blob = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "notepad.exe"
(Note: The default value data of the said registry entry is iexplore.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "4117cc3"
(Note: The default value data of the said registry entry is 41107b81.)
Dropping Routine
This Trojan drops the following files:
- %System Root%\ProgramData\TuvjywK\RyunogB\md9.bmp
- %System Root%\ProgramData\TuvjywK\RyunogB\mdb-11-md9
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Restart in Safe Mode
Step 3
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
- sistemanet
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- ElsxjvO = "%System Root%\ProgramData\TuvjywK\CtlouiB\ElsxjvO.exe"
- In HKEY_CURRENT_USER\Software\sistemanet
- direct = "jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjhdjaagjaahjaofjabajaaijge)"
- In HKEY_CURRENT_USER\Software\sistemanet
- name1 = "jfijaohjaaejabojaofjaahjgi)"
- In HKEY_CURRENT_USER\Software\sistemanet
- lugarjpg = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- dir2 = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- dir = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- l001 = "jaaf)"
- In HKEY_CURRENT_USER\Software\sistemanet
- aviso = "jaaejaoejaoi)"
- In HKEY_CURRENT_USER\Software\sistemanet
- data = "jdhjec)"
Step 5
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\SystemCertificates\CA\Certificates\FE622EA7B33CA46519AB39736A66B8F6E41FF157
- From: Blob = "{random values}"
To: Blob = ""{random values}""
- From: Blob = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: Name = "notepad.exe"
To: Name = ""iexplore.exe""
- From: Name = "notepad.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: ID = "4117cc3"
To: ID = ""41107b81""
- From: ID = "4117cc3"
Step 6
Search and delete these files
- %System Root%\ProgramData\TuvjywK\RyunogB\md9.bmp
- %System Root%\ProgramData\TuvjywK\RyunogB\mdb-11-md9
Step 7
Search and delete these folders
- %System Root%\ProgramData
- %System Root%\ProgramData\TuvjywK
- %System Root%\ProgramData\TuvjywK\OncfoyP
- %System Root%\ProgramData\TuvjywK\CtlouiB
- %System Root%\ProgramData\TuvjywK\RyunogB
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_INJECTOR.NP. 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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