TROJ_DROPPER.GNY
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
100,864 bytes
EXE
No
13 Dec 2013
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 creates the following folders:
- %User Temp%\7ot2bg1k3n
- %User Profile%\Network\Downloader
(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.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\8.tmp
- %User Temp%\58.tmp
- %User Temp%\73.tmp
- %User Temp%\94.tmp
- %User Temp%\99.tmp
- %User Temp%\9D.tmp
- %User Temp%\B9.tmp
- %User Temp%\BC.tmp
- %User Temp%\C0.tmp
- %User Temp%\C4.tmp
- %User Temp%\C7.tmp
- %User Temp%\CC.tmp
- %User Temp%\CF.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 keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\BITS
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\BITS\CtlGuid
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\BITS
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Command Processor
AutoRun = "regsvr32 /n /i /s %Application Data%\bufrx.bse"
HKEY_CURRENT_USER\Keyboard Layout\Toggle
Ec1Op4Gg3Ot2Hu = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\BITS
LogSessionName = "stdout"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\BITS
Active = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\BITS
ControlFlags = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\BITS\CtlGuid
Guid = "4a8aaa94-cfc4-46a7-8e4e-17bc45608f0a"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\BITS\CtlGuid
BitNames = "{random characters}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\BackupRestore\FilesNotToBackup
BITS_metadata = "%User Profile%\Downloader\*"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\BITS
StateIndex = "0"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\ichcqgh.azm
- %Common Startup%\ctfmon.lnk
- %Application Data%\bufrx.bse
- %User Temp%\7ot2bg1k3n\6svw6h2
- %User Temp%\7ot2bg1k3n\libcurl.dll
- %User Temp%\7ot2bg1k3n\libeay32.dll
- %User Temp%\7ot2bg1k3n\libidn-11.dll
- %User Temp%\7ot2bg1k3n\pthreadGC2.dll
- %User Temp%\7ot2bg1k3n\ssleay32.dll
- %User Temp%\7ot2bg1k3n\zlib1.dll
- %User Temp%\7ot2bg1k3n\9r3vde6
- %User Temp%\7ot2bg1k3n\2p2uac9
- %User Temp%\7ot2bg1k3n\0lz0ad1
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %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.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}vew58dv0td.com/?{random characters}
- http://{BLOCKED}vew58dv0td.com/?cgl=ynsmaik
- http://{BLOCKED}vew58dv0td.com/?iv=yfumrbm
- http://{BLOCKED}vew58dv0td.com/?n=qsqydx
- http://{BLOCKED}vew58dv0td.com/?xedak=otgvami
This report is generated via an automated analysis system.
SOLUTION
9.300
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\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft
- BITS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\BITS
- CtlGuid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
- BITS
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\Microsoft\Command Processor
- AutoRun = "regsvr32 /n /i /s %Application Data%\bufrx.bse"
- In HKEY_CURRENT_USER\Keyboard Layout\Toggle
- Ec1Op4Gg3Ot2Hu = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\BITS
- LogSessionName = "stdout"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\BITS
- Active = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\BITS
- ControlFlags = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\BITS\CtlGuid
- Guid = "4a8aaa94-cfc4-46a7-8e4e-17bc45608f0a"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\BITS\CtlGuid
- BitNames = "{random characters}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\BackupRestore\FilesNotToBackup
- BITS_metadata = "%User Profile%\Downloader\*"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\BITS
- StateIndex = "0"
Step 4
Search and delete these components
- %User Profile%\Application Data\ichcqgh.azm
- %Common Startup%\ctfmon.lnk
- %Application Data%\bufrx.bse
- %User Temp%\7ot2bg1k3n\6svw6h2
- %User Temp%\7ot2bg1k3n\libcurl.dll
- %User Temp%\7ot2bg1k3n\libeay32.dll
- %User Temp%\7ot2bg1k3n\libidn-11.dll
- %User Temp%\7ot2bg1k3n\pthreadGC2.dll
- %User Temp%\7ot2bg1k3n\ssleay32.dll
- %User Temp%\7ot2bg1k3n\zlib1.dll
- %User Temp%\7ot2bg1k3n\9r3vde6
- %User Temp%\7ot2bg1k3n\2p2uac9
- %User Temp%\7ot2bg1k3n\0lz0ad1
Step 5
Search and delete these folders
- %User Temp%\7ot2bg1k3n
- %User Profile%\Network\Downloader
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.GNY. 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%\8.tmp
- %User Temp%\58.tmp
- %User Temp%\73.tmp
- %User Temp%\94.tmp
- %User Temp%\99.tmp
- %User Temp%\9D.tmp
- %User Temp%\B9.tmp
- %User Temp%\BC.tmp
- %User Temp%\C0.tmp
- %User Temp%\C4.tmp
- %User Temp%\C7.tmp
- %User Temp%\CC.tmp
- %User Temp%\CF.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
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