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ADW_URYLINK

September 05, 2014
 Analysis by: Jaime Benigno Reyes
 ALIASES:

AdWare.Linkury (Ikarus); Adware.Linkury (fs) (Vipre)

 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:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This adware may be manually installed by a user.

  TECHNICAL DETAILS

File Size:

23,160 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Sep 2014

Arrival Details

This adware may be manually installed by a user.

Installation

This adware drops the following files:

  • %Application Data%\Microsoft\CLR Security Config\v2.0.50727.312\security.config.cch (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\62B5AF9BE9ADC1085C3C56EC07A82BF6 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\7B8944BA8AD0EFDF0E01A43EF62BECD0_FB7A7E5BCB0A8A0CBEDCE7E447921E38 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\7D266D9E1E69FA1EEFB9699B009B34C8_0A9BFDD75B598C2110CBF610C078E6E6 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\8DFDF057024880D7A081AFBF6D26B92F (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\62B5AF9BE9ADC1085C3C56EC07A82BF6 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\7B8944BA8AD0EFDF0E01A43EF62BECD0_FB7A7E5BCB0A8A0CBEDCE7E447921E38 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\7D266D9E1E69FA1EEFB9699B009B34C8_0A9BFDD75B598C2110CBF610C078E6E6 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\8DFDF057024880D7A081AFBF6D26B92F (Windows Vista and higher versions)
  • %Application Data%\Microsoft\CLR Security Config\v2.0.50727.42\security.config.cch (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CLR Security Config\v2.0.50727.42\security.config.cch.{4 digits}.{7 digits} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\62B5AF9BE9ADC1085C3C56EC07A82BF6 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\8DFDF057024880D7A081AFBF6D26B92F (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\62B5AF9BE9ADC1085C3C56EC07A82BF6 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\8DFDF057024880D7A081AFBF6D26B92F (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015 (Versions lower than Windows Vista)

(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.. %AppDataLocalLow% is the LocalLow Application Data folder, which is usually C:\Users\{user name}\AppData\LocalLow on Windows Vista and 7.)

It creates the following folders:

  • %User Temp%\MSI{random}.tmp- (Windows Vista and higher versions)
  • %Windows%\Installer\MSI{random}.tmp- (Versions lower than Windows Vista)

(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.)

Other System Modifications

This adware adds the following registry keys:

HKEY_CURRENT_USER\Software\SmartbarLog

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4EB6D578499B1CCF5F581EAD56BE3D9B6744A5E5

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4EB6D578499B1CCF5F581EAD56BE3D9B6744A5E5
Blob = "{hex value}

Other Details

This adware connects to the following possibly malicious URL:

  • http://www.download.{BLOCKED}supdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt
  • http://www.download.{BLOCKED}update.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab
  • http://www.download.{BLOCKED}supdate.com/msdownload/update/v3/static/trustedr/en/4EB6D578499B1CCF5F581EAD56BE3D9B6744A5E5.crt
  • http://crl.{BLOCKED}gn.com/pca3-g5.crl
  • http://csc3-2010-crl.{BLOCKED}ign.com/CSC3-2010.crl
  • http://cloud-search.{BLOCKED}y.com/MaxMind.asmx/GetGeoInfo
  • http://svc-stats.{BLOCKED}y.com/StateStatisticsService.svc/V1/SOAP
  • http://linkurytest-privateinvestigation-westeurope.{BLOCKED}pp.net:8080/PrivateInvestigationService.svc/ws
  • http://linkurytest-privateinvestigation-westeurope.{BLOCKED}pp.net:8080/PrivateInvestigationService.svc/ws
  • http://svc-stats.{BLOCKED}y.com/StatisticsService.svc/V1/SOAP
  • http://svc-stats.{BLOCKED}y.com/StatisticsService.svc/V1/SOAP
  • http://svc-stats.{BLOCKED}y.com/StatisticsService.svc/V1/SOAP

  SOLUTION

Minimum Scan Engine:

9.700

SSAPI PATTERN File:

1.538.14

SSAPI PATTERN Date:

22 Aug 2014

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

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\SmartbarLog
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4EB6D578499B1CCF5F581EAD56BE3D9B6744A5E5

Step 4

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 Temp%\MSI{random}.tmp- (Windows Vista and higher versions)
  • %Windows%\Installer\MSI{random}.tmp- (Versions lower than Windows Vista)

Step 5

Search and delete this file

[ Learn More ]
There may be some files 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.
  • %Application Data%\Microsoft\CLR Security Config\v2.0.50727.312\security.config.cch (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\62B5AF9BE9ADC1085C3C56EC07A82BF6 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\7B8944BA8AD0EFDF0E01A43EF62BECD0_FB7A7E5BCB0A8A0CBEDCE7E447921E38 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\7D266D9E1E69FA1EEFB9699B009B34C8_0A9BFDD75B598C2110CBF610C078E6E6 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\8DFDF057024880D7A081AFBF6D26B92F (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\62B5AF9BE9ADC1085C3C56EC07A82BF6 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\7B8944BA8AD0EFDF0E01A43EF62BECD0_FB7A7E5BCB0A8A0CBEDCE7E447921E38 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\7D266D9E1E69FA1EEFB9699B009B34C8_0A9BFDD75B598C2110CBF610C078E6E6 (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\8DFDF057024880D7A081AFBF6D26B92F (Windows Vista and higher versions)
  • %Application Data%\Microsoft\CLR Security Config\v2.0.50727.42\security.config.cch (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CLR Security Config\v2.0.50727.42\security.config.cch.{4 digits}.{7 digits} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\62B5AF9BE9ADC1085C3C56EC07A82BF6 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\8DFDF057024880D7A081AFBF6D26B92F (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\62B5AF9BE9ADC1085C3C56EC07A82BF6 (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\8DFDF057024880D7A081AFBF6D26B92F (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015 (Versions lower than Windows Vista)

Step 6

Scan your computer with your Trend Micro product to delete files detected as ADW_URYLINK. 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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