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Threat Encyclopedia

TROJ_SPAMBOT.B


ALIASES:

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)

PLATFORM:

Windows 2000, XP, Server 2003

OVERALL RISK RATING:
DAMAGE POTENTIAL:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:

  • 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

File Size:

24,548 bytes

File Type:

EXE

Initial Samples Received Date:

06 Oct 2011

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

Minimum Scan Engine:

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

Delete this registry key

[ Learn More ]

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

[ Learn More ]

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

[ Learn More ]

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

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %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

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %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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