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ADW_SOLIMBA.GA

July 31, 2014
 Analysis by: Jaime Benigno Reyes
 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 arrives as a component bundled with malware/grayware packages. It may be manually installed by a user.

  TECHNICAL DETAILS

File Size:

293,208 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

23 Jul 2014

Arrival Details

This adware arrives as a component bundled with malware/grayware packages.

It may be manually installed by a user.

Installation

This adware drops the following files:

  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 1} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 2} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 3} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 1} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 2} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 3} (Windows Vista and higher versions)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 1} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 2} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 3} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 1} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 2} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 3} (Versions lower than Windows Vista)

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

Other System Modifications

This adware adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
91C6D6EE3E8AC86384E548C299295C756C817B81

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
91C6D6EE3E8AC86384E548C299295C756C817B81
Blob = "{hex value}"

Other Details

This adware connects to the following possibly malicious URL:

  • http://www.download.{BLOCKED}supdate.com/{BLOCKED}ownload/update/v3/static/trustedr/en/authrootseq.txt
  • http://www.download.{BLOCKED}supdate.com/{BLOCKED}ownload/update/v3/static/trustedr/en/authrootstl.cab
  • http://www.download.{BLOCKED}supdate.com/{BLOCKED}ownload/update/v3/static/trustedr/en/91C6D6EE3E8AC86384E548C299295C756C817B81.crt
  • http://crl.{BLOCKED}wte.com/ThawtePCA.crl
  • http://cs-{BLOCKED}rl.{BLOCKED}wte.com/ThawteCSG2.crl

  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

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_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates
    • 91C6D6EE3E8AC86384E548C299295C756C817B81

Step 4

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.
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 1} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 2} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 3} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 1} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 2} (Windows Vista and higher versions)
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 3} (Windows Vista and higher versions)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 1} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 2} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\{alphanumeric characters 3} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 1} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 2} (Versions lower than Windows Vista)
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\{alphanumeric characters 3} (Versions lower than Windows Vista)

Step 5

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