TROJ_ALLAN.DUKKS
Trojan:Win32/Cryptrun.B (Microsoft); Generic Dropper!1gm (McAfee); Trojan.Gen (Symantec); Trojan-Dropper.Win32.Dapato.tfc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.7054766 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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.
It modifies files, disabling programs and applications from properly running.
It deletes itself after execution.
TECHNICAL DETAILS
156,672 bytes
EXE
No
27 Aug 2012
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.
Other System Modifications
This Trojan modifies the following files:
- %User Profile%\Application Data\Microsoft
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Dropping Routine
This Trojan drops the following files:
- %Application Data%\GoogleUpdate.exe
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}e.com/search?qu=
- http://www.{BLOCKED}e.comsearch5422?{random characters}
- http://www.{BLOCKED}e.comsearch5490?{random characters}
- http://www.{BLOCKED}e.comsearch5559?{random characters}
- http://www.{BLOCKED}e.comsearch5627?{random characters}
- http://www.{BLOCKED}e.comsearch5696?{random characters}
- http://www.{BLOCKED}e.comsearch5764?{random characters}
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.200
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Search and delete these files
- %Application Data%\GoogleUpdate.exe
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
Step 3
Scan your computer with your Trend Micro product to delete files detected as TROJ_ALLAN.DUKKS. 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 4
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.
- %User Profile%\Application Data\Microsoft
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