TROJ_CRYPTIC.BK
Windows 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan accesses websites to download files. This action allows this malware to possibly add other malware on the affected computer. It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
It deletes itself after execution.
TECHNICAL DETAILS
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Printers\Connections
affid = "396"
HKEY_CURRENT_USER\Printers\Connections
subid = "landing"
HKEY_CURRENT_USER\Printers\Connections
time = 1
Dropping Routine
This Trojan drops the following files:
- %System Root%\Documents and Settings\All Users\Favorites\_favdata.dat
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Download Routine
This Trojan accesses websites to download the following files:
- http://www.{BLOCKED}utomatic.org/a/ad
Trend Micro detects the dowloaded file as:
- TROJ_FAKEAV.DFR
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}ullviv.com/a/ad
It deletes itself after execution.
SOLUTION
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
Remove malware files dropped/downloaded by TROJ_CRYPTIC.BK
- TROJ_FAKEAV.DFR
Step 3
Delete this registry value
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\Printers\Connections
- affid=396
- affid=396
- In HKEY_CURRENT_USER\Printers\Connections
- subid=landing
- subid=landing
- In HKEY_CURRENT_USER\Printers\Connections
- time=1
- time=1
Step 4
Search and delete this file
- %System Root%\Documents and Settings\All Users\Favorites\_favdata.dat
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_CRYPTIC.BK. 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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