TROJ_SPAMBOT.B
TrojanSpy:Win32/Ursnif.G (Microsoft); Spy-Agent.bg (McAfee); Hacktool.Rootkit (Symantec); PAK:PE_Patch, PAK:UPack, Trojan-PSW.Win32.Papras.w (Kaspersky); Trojan.Win32.Packer.Upack0.3.9 (ep) (Sunbelt); Trojan.Generic.3139055 (FSecure)
Windows 2000, XP, 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
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:
- %Windows%\9129837.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It creates the following folders:
- %User Profile%\Application Data\VMware
- %User Profile%\Microsoft\Dr Watson
- %Windows%\SoftwareDistribution
- %Windows%\SoftwareDistribution\DataStore\Logs\
- %Windows%\SoftwareDistribution\DataStore
(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.. %Windows% is the Windows folder, which is usually C:\Windows.)
Other System Modifications
This Trojan deletes the following files:
- {malware path and file name}
- %System Root%\a.bat
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
InetData
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
InetData
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
InetData
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
InetData
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
InetData
k1 = 23785df6
HKEY_CURRENT_USER\Software\Microsoft\
InetData
k2 = 468779a
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ttool = "%Windows%\9129837.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ttool = "%Windows%\9129837.exe"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DrWatson
NumberOfCrashes = 1
(Note: The default value data of the said registry entry is 0.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
PCHealth\ErrorReporting\DW
Dropping Routine
This Trojan drops the following files:
- %System Root%\a.bat
- %Windows%\hide_evr2.sys
- %User Profile%\Dr Watson\drwtsn32.log
- %User Profile%\Dr Watson\user.dmp
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows.. %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 Details
This Trojan connects to the following possibly malicious URL:
- /cgi-bin/pstore.cgi
- /cgi-bin/cert.cgi
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_CURRENT_USER\Software\Microsoft
- InetData
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft
- InetData
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft
- InetData
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft
- InetData
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\InetData
- k1=23785df6
- In HKEY_CURRENT_USER\Software\Microsoft\InetData
- k2=468779a
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- ttool="%Windows%\9129837.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- ttool="%Windows%\9129837.exe"
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\DrWatson
- From: NumberOfCrashes=1
To: NumberOfCrashes=0
- From: NumberOfCrashes=1
Step 5
Search and delete these folders
- %User Profile%\Application Data\VMware
- %User Profile%\Microsoft\Dr Watson
- %Windows%\SoftwareDistribution
- %Windows%\SoftwareDistribution\DataStore\Logs\
- %Windows%\SoftwareDistribution\DataStore
Step 6
Search and delete these components
- %System Root%\a.bat
- %Windows%\hide_evr2.sys
- %User Profile%\Dr Watson\drwtsn32.log
- %User Profile%\Dr Watson\user.dmp
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_SPAMBOT.B. 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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