TROJ_DLOADR.JCS
RDN/Generic Downloader.x!kl (McAfee); HEUR:Trojan.Win32.Generic (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Found Win32/DH.FF8200A4{gRI0LoET} (AVG)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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 creates the following folders:
- %User Temp%/72a34d4d
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/content
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf
(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.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Update\ClientState\{8A69D345-D564-463C-AFF1-A69D9E530F96}
HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Update\ClientState\{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Update\ClientState\{8A69D345-D564-463C-AFF1-A69D9E530F96}
ap = "2.0-dev-multi-chrome"
HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Update\ClientState\{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}
ap = "-dev-multi-chrome"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\pl6db1039a.fyt
- %User Temp%\294823_.exe
- %User Temp%/72a34d4d/WT7oBxg.dat
- %User Temp%/72a34d4d/WT7oBxg.exe
- %User Temp%/72a34d4d/HQKeZR.x64.dll
- %User Temp%/72a34d4d/HQKeZR.tlb
- %User Temp%/72a34d4d/HQKeZR.dll
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/content/bg.js
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/install.rdf
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/chrome.manifest
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/bootstrap.js
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/lsdb.js
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/content.js
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/manifest.json
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/background.html
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/I2gOf31j.js
(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.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://download.{BLOCKED}n.info/?{random characters}
- {BLOCKED}2.196.211
- {BLOCKED}1.117.97
This report is generated via an automated analysis system.
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
Delete this registry key
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\Google\Update\ClientState
- {8A69D345-D564-463C-AFF1-A69D9E530F96}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Google\Update\ClientState
- {4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}
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\Google\Update\ClientState\{8A69D345-D564-463C-AFF1-A69D9E530F96}
- ap = "2.0-dev-multi-chrome"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Google\Update\ClientState\{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}
- ap = "-dev-multi-chrome"
Step 4
Search and delete these components
- %User Temp%\pl6db1039a.fyt
- %User Temp%\294823_.exe
- %User Temp%/72a34d4d/WT7oBxg.dat
- %User Temp%/72a34d4d/WT7oBxg.exe
- %User Temp%/72a34d4d/HQKeZR.x64.dll
- %User Temp%/72a34d4d/HQKeZR.tlb
- %User Temp%/72a34d4d/HQKeZR.dll
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/content/bg.js
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/install.rdf
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/chrome.manifest
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/bootstrap.js
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/lsdb.js
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/content.js
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/manifest.json
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/background.html
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf/I2gOf31j.js
Step 5
Search and delete these folders
- %User Temp%/72a34d4d
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org
- %User Temp%/72a34d4d/yop-h@vzcu-wwko.org/content
- %User Temp%/72a34d4d/ilnipmkbghiicfdpkmkooeacoapigmhf
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.JCS. 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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