TROJ_YAKES.GU
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It connects to certain websites to send and receive information. It deletes the initially executed copy of itself.
TECHNICAL DETAILS
50,688 bytes
EXE
Yes
21 Nov 2011
Connects to URLs/IPs
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This Trojan drops the following copies of itself into the affected system:
- %User Profile%\Application Data\csrss.exe
(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.)
It adds the following processes:
- svchost.exe
It injects itself into the following processes as part of its memory residency routine:
- svchost.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
{random} = "%User Profile%\Application Data\csrss.exe"
Other Details
This Trojan connects to the following website to send and receive information:
- http:/{BLOCKED}290.ru/ixo/index.php
It deletes the initially executed copy of itself
NOTES:
Below are samples of the spammed messages where this malware comes as an attachment:
SOLUTION
9.200
8.588.08
21 Nov 2011
8.589.00
22 Nov 2011
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
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
- {random} = "%User Profile%\Application Data\csrss.exe"
- {random} = "%User Profile%\Application Data\csrss.exe"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_YAKES.GU. 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 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_YAKES.GU. 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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