TSPY_BANKER.YOUR

August 07, 2014
 ALIASES:

Trojan-Ransom.Win32.Cryptodef.ql (Kaspersky); Win32.Malware!Drop (Sunbelt)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware 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 itself after execution.

  TECHNICAL DETAILS

File Size:

142,848 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

07 Aug 2014

Arrival Details

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

This spyware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
785a01 = "%System Root%\785a019\785a019.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
785a019 = "%User Profile%\Application Data\785a019.exe"

Other System Modifications

This spyware modifies the following file(s):

  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD
  • %User Profile%\Templates\excel.xls
  • %User Profile%\Templates\excel4.xls
  • %User Profile%\Templates\powerpnt.ppt
  • %User Profile%\Templates\quattro.wb2
  • %User Profile%\Templates\sndrec.wav
  • %User Profile%\Templates\winword.doc
  • %User Profile%\Templates\winword2.doc
  • %User Profile%\Templates\wordpfct.wpd

(Note: %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 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.)

It deletes the following files:

  • %System Root%\785a019

(Note: %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_CURRENT_USER\software\785A019AC2520437E6A2639A52718427

HKEY_CURRENT_USER\software\785A019AC2520437E6A2639A52718427\
1222345667789AAE

It adds the following registry entries:

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427
8a = "{random values}"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427
5b = "{random characters}"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427
ac = "{random characters}"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427
0d = "{random characters}"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Internet Explorer\brndlog.bak = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Internet Explorer\brndlog.txt = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Templates\excel.xls = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Templates\excel4.xls = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Templates\powerpnt.ppt = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Templates\quattro.wb2 = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Templates\sndrec.wav = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Templates\winword.doc = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Templates\winword2.doc = "68adfd"

HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\
1222345667789AAE
%User Profile%\Templates\wordpfct.wpd = "68adfd"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = "1"

Dropping Routine

This spyware drops the following files:

  • %System Root%\785a019\785a019.exe
  • %User Profile%\Application Data\785a019.exe
  • %User Startup%\785a019.exe
  • A:\DECRYPT_INSTRUCTION.TXT
  • A:\DECRYPT_INSTRUCTION.HTML
  • A:\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Internet Explorer\brndlog.bak.3uc
  • %User Profile%\Internet Explorer\brndlog.bak
  • %User Profile%\Internet Explorer\brndlog.txt.g26
  • %User Profile%\Internet Explorer\brndlog.txt
  • %User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Microsoft\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Microsoft\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Microsoft\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Application Data\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Application Data\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Application Data\DECRYPT_INSTRUCTION.URL
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.s3m
  • %Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.TXT
  • %Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.HTML
  • %Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.URL
  • %Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.TXT
  • %Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.HTML
  • %Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.URL
  • %Application Data%\Microsoft\DECRYPT_INSTRUCTION.TXT
  • %Application Data%\Microsoft\DECRYPT_INSTRUCTION.HTML
  • %Application Data%\Microsoft\DECRYPT_INSTRUCTION.URL
  • %Application Data%\DECRYPT_INSTRUCTION.TXT
  • %Application Data%\DECRYPT_INSTRUCTION.HTML
  • %Application Data%\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Local Settings\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Local Settings\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Local Settings\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Templates\excel.xls.s2f
  • %User Profile%\Templates\excel4.xls.e91
  • %User Profile%\Templates\powerpnt.ppt.fh9
  • %User Profile%\Templates\quattro.wb2.5jd
  • %User Profile%\Templates\sndrec.wav.zl9
  • %User Profile%\Templates\winword.doc.tz5
  • %User Profile%\Templates\winword2.doc.j2e
  • %User Profile%\Templates\wordpfct.wpd.u5z
  • %User Profile%\Templates\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Templates\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Templates\DECRYPT_INSTRUCTION.URL
  • %User Profile%\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Internet Explorer\brndlog.bak.my3
  • %User Profile%\Internet Explorer\brndlog.txt.7l8
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.s6v
  • %User Profile%\Templates\excel.xls.oy1
  • %User Profile%\Templates\excel4.xls.2gt
  • %User Profile%\Templates\powerpnt.ppt.xd4
  • %User Profile%\Templates\quattro.wb2.h13
  • %User Profile%\Templates\sndrec.wav.9rm
  • %User Profile%\Templates\winword.doc.r4r
  • %User Profile%\Templates\winword2.doc.5hu
  • %User Profile%\Templates\wordpfct.wpd.6rs
  • %System Root%\Documents and Settings\DECRYPT_INSTRUCTION.TXT
  • %System Root%\Documents and Settings\DECRYPT_INSTRUCTION.HTML
  • %System Root%\Documents and Settings\DECRYPT_INSTRUCTION.URL
  • %System Root%\DECRYPT_INSTRUCTION.TXT
  • %System Root%\DECRYPT_INSTRUCTION.HTML
  • %System Root%\DECRYPT_INSTRUCTION.URL
  • %Desktop%\DECRYPT_INSTRUCTION.TXT
  • %Desktop%\DECRYPT_INSTRUCTION.HTML
  • %Desktop%\DECRYPT_INSTRUCTION.URL
  • %User Startup%\DECRYPT_INSTRUCTION.TXT
  • %User Startup%\DECRYPT_INSTRUCTION.HTML
  • %User Startup%\DECRYPT_INSTRUCTION.URL

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %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.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.)

Other Details

This spyware connects to the following possibly malicious URL:

  • http://{BLOCKED}aultppc.com
  • {BLOCKED}.101.96
  • {BLOCKED}0.1
  • {BLOCKED}.77.26

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.700

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

Restart in Safe Mode

[ Learn More ]

Step 3

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
    • 785A019AC2520437E6A2639A52718427
  • In HKEY_CURRENT_USER\software\785A019AC2520437E6A2639A52718427
    • 1222345667789AAE

Step 4

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\Windows\CurrentVersion\Run
    • 785a01 = "%System Root%\785a019\785a019.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • 785a019 = "%User Profile%\Application Data\785a019.exe"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427
    • 8a = "{random values}"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427
    • 5b = "{random characters}"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427
    • ac = "{random characters}"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427
    • 0d = "{random characters}"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Internet Explorer\brndlog.bak = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Internet Explorer\brndlog.txt = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Templates\excel.xls = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Templates\excel4.xls = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Templates\powerpnt.ppt = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Templates\quattro.wb2 = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Templates\sndrec.wav = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Templates\winword.doc = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Templates\winword2.doc = "68adfd"
  • In HKEY_CURRENT_USER\Software\785A019AC2520437E6A2639A52718427\1222345667789AAE
    • %User Profile%\Templates\wordpfct.wpd = "68adfd"

Step 5

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\Windows NT\CurrentVersion\SystemRestore
    • DisableSR = "1"

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%\785a019\785a019.exe
  • %User Profile%\Application Data\785a019.exe
  • %User Startup%\785a019.exe
  • A:\DECRYPT_INSTRUCTION.TXT
  • A:\DECRYPT_INSTRUCTION.HTML
  • A:\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Internet Explorer\brndlog.bak.3uc
  • %User Profile%\Internet Explorer\brndlog.bak
  • %User Profile%\Internet Explorer\brndlog.txt.g26
  • %User Profile%\Internet Explorer\brndlog.txt
  • %User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Microsoft\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Microsoft\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Microsoft\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Application Data\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Application Data\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Application Data\DECRYPT_INSTRUCTION.URL
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.s3m
  • %Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.TXT
  • %Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.HTML
  • %Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.URL
  • %Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.TXT
  • %Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.HTML
  • %Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.URL
  • %Application Data%\Microsoft\DECRYPT_INSTRUCTION.TXT
  • %Application Data%\Microsoft\DECRYPT_INSTRUCTION.HTML
  • %Application Data%\Microsoft\DECRYPT_INSTRUCTION.URL
  • %Application Data%\DECRYPT_INSTRUCTION.TXT
  • %Application Data%\DECRYPT_INSTRUCTION.HTML
  • %Application Data%\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Local Settings\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Local Settings\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Local Settings\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Templates\excel.xls.s2f
  • %User Profile%\Templates\excel4.xls.e91
  • %User Profile%\Templates\powerpnt.ppt.fh9
  • %User Profile%\Templates\quattro.wb2.5jd
  • %User Profile%\Templates\sndrec.wav.zl9
  • %User Profile%\Templates\winword.doc.tz5
  • %User Profile%\Templates\winword2.doc.j2e
  • %User Profile%\Templates\wordpfct.wpd.u5z
  • %User Profile%\Templates\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\Templates\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\Templates\DECRYPT_INSTRUCTION.URL
  • %User Profile%\DECRYPT_INSTRUCTION.TXT
  • %User Profile%\DECRYPT_INSTRUCTION.HTML
  • %User Profile%\DECRYPT_INSTRUCTION.URL
  • %User Profile%\Internet Explorer\brndlog.bak.my3
  • %User Profile%\Internet Explorer\brndlog.txt.7l8
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.s6v
  • %User Profile%\Templates\excel.xls.oy1
  • %User Profile%\Templates\excel4.xls.2gt
  • %User Profile%\Templates\powerpnt.ppt.xd4
  • %User Profile%\Templates\quattro.wb2.h13
  • %User Profile%\Templates\sndrec.wav.9rm
  • %User Profile%\Templates\winword.doc.r4r
  • %User Profile%\Templates\winword2.doc.5hu
  • %User Profile%\Templates\wordpfct.wpd.6rs
  • %System Root%\Documents and Settings\DECRYPT_INSTRUCTION.TXT
  • %System Root%\Documents and Settings\DECRYPT_INSTRUCTION.HTML
  • %System Root%\Documents and Settings\DECRYPT_INSTRUCTION.URL
  • %System Root%\DECRYPT_INSTRUCTION.TXT
  • %System Root%\DECRYPT_INSTRUCTION.HTML
  • %System Root%\DECRYPT_INSTRUCTION.URL
  • %Desktop%\DECRYPT_INSTRUCTION.TXT
  • %Desktop%\DECRYPT_INSTRUCTION.HTML
  • %Desktop%\DECRYPT_INSTRUCTION.URL
  • %User Startup%\DECRYPT_INSTRUCTION.TXT
  • %User Startup%\DECRYPT_INSTRUCTION.HTML
  • %User Startup%\DECRYPT_INSTRUCTION.URL

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_BANKER.YOUR. 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 deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD
    • %User Profile%\Templates\excel.xls
    • %User Profile%\Templates\excel4.xls
    • %User Profile%\Templates\powerpnt.ppt
    • %User Profile%\Templates\quattro.wb2
    • %User Profile%\Templates\sndrec.wav
    • %User Profile%\Templates\winword.doc
    • %User Profile%\Templates\winword2.doc
    • %User Profile%\Templates\wordpfct.wpd

Step 9

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 Root%\785a019


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