TROJ_INJECT.YYKR
Mal/Behav-160 (Sophos) ,W32/Agent.KNJV!tr (Fortinet) ,Trojan-Downloader.Win32.Tandfuy (Ikarus) ,Trojan-Dropper.Win32.Agent.knjv (Kaspersky) ,TrojanDownloader:Win32/Tandfuy.B, TrojanDownloader:Win32/Tandfuy.B (Microsoft) ,Win32/Bipamid.A trojan (Eset) ,Suspicious file (Panda) ,Trojan.Win32.Generic!BT (Sunbelt)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
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.
TECHNICAL DETAILS
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.
Installation
This Trojan drops the following files:
- %System Root%\a.dat
- %System%\midimapbits.dll
- %Windows%\Temp\version361.dat
- %Windows%\Temp\98768515.txt
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
v3configure = "rundll32.exe %Windows%\Temp\98768515.txt,A"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}data.com/eng/test/jp1.php?m={value}&os={OS Version}&ie={IE Version}
SOLUTION
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
Restart in Safe Mode
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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- v3configure = "rundll32.exe %Windows%\Temp\98768515.txt,A"
- v3configure = "rundll32.exe %Windows%\Temp\98768515.txt,A"
Step 4
Search and delete these files
- %System Root%\a.dat
- %System%\midimapbits.dll
- %Windows%\Temp\version361.dat
- %Windows%\Temp\98768515.txt
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_INJECT.YYKR. 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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