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TSPY_RANBYUS.A

July 14, 2014
 ALIASES:

TrojanSpy:Win32/Ranbyus.G (Microsoft); RDN/Generic.bfr!hk (McAfee); Trojan.Smoaler (Symantec); Trojan-Banker.Win32.Fibbit.pmc (Kaspersky); Mal/Generic-L (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic_s.DRF (AVG)

 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 disables Task Manager, Registry Editor, and Folder Options.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

160,768 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

14 Jul 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.

Installation

This spyware drops the following copies of itself into the affected system:

  • %System%\machineupper32.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This spyware deletes the following files:

  • %User Profile%\Cookies\index.dat
  • %User Profile%\Cookies\wilbert@atdmt[2].txt
  • %User Profile%\Cookies\wilbert@bing[2].txt
  • %User Profile%\Cookies\wilbert@c.atdmt[2].txt
  • %User Profile%\Cookies\wilbert@c.msn[2].txt
  • %User Profile%\Cookies\wilbert@doubleclick[1].txt
  • %User Profile%\Cookies\wilbert@microsoft[1].txt
  • %User Profile%\Cookies\wilbert@msnportal.112.2o7[1].txt
  • %User Profile%\Cookies\wilbert@msn[2].txt
  • %User Profile%\Cookies\wilbert@scorecardresearch[2].txt
  • %User Profile%\Cookies\wilbert@www.bing[2].txt
  • %User Profile%\Cookies\wilbert@www.msn[1].txt

It adds the following registry keys:

HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\
Microsoft\Windows\CurrentVersion\
policies\Explorer\Run

HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\
BIFIT

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
SysDebug32 = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\svchost.exe = "%System%\svchost.exe:*:Enabled:Windows Debugger 32"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
Windows Debugger 32 = "ffffffff"

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
Windows Debugger 32 = "%System%\machineupper32.exe"

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows NT\CurrentVersion\SystemRestore

Other Details

This spyware connects to the following possibly malicious URL:

  • http://www.{BLOCKED}e.biz/consulting/index.php?{random characters}
  • {BLOCKED}.202.66

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

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

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_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\Microsoft\Windows\CurrentVersion\policies\Explorer
    • Run
  • In HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software
    • BIFIT

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 NT\CurrentVersion\Winlogon
    • SysDebug32 = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\svchost.exe = "%System%\svchost.exe:*:Enabled:Windows Debugger 32"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • Windows Debugger 32 = "ffffffff"

Step 5

Scan your computer with your Trend Micro product to delete files detected as TSPY_RANBYUS.A. 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 6

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 Profile%\Cookies\index.dat
  • %User Profile%\Cookies\wilbert@atdmt[2].txt
  • %User Profile%\Cookies\wilbert@bing[2].txt
  • %User Profile%\Cookies\wilbert@c.atdmt[2].txt
  • %User Profile%\Cookies\wilbert@c.msn[2].txt
  • %User Profile%\Cookies\wilbert@doubleclick[1].txt
  • %User Profile%\Cookies\wilbert@microsoft[1].txt
  • %User Profile%\Cookies\wilbert@msnportal.112.2o7[1].txt
  • %User Profile%\Cookies\wilbert@msn[2].txt
  • %User Profile%\Cookies\wilbert@scorecardresearch[2].txt
  • %User Profile%\Cookies\wilbert@www.bing[2].txt
  • %User Profile%\Cookies\wilbert@www.msn[1].txt

Step 7

Restore these deleted registry keys/values from backup

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

  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion
    • SystemRestore


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