WORM_RENOCIDE.YY
Worm:Win32/Renocide.gen!G (Microsoft); Trojan.Win32.Autoit.aip (Kaspersky); W32/Sohana-DL (Sophos)
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: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes itself after execution.
TECHNICAL DETAILS
658,944 bytes
EXE
Yes
06 Jun 2014
Arrival Details
This worm 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 worm drops the following copies of itself into the affected system:
- %System%\csrcs.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This worm modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe csrcs.exe"
(Note: The default value data of the said registry entry is Explorer.exe.)
Other System Modifications
This worm adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
DRM\amty
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
ilop = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
csrcs = "%System%\csrcs.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
fix1 = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
exp1 = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
dreg = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
regexp = "0.0839594367418485"
Dropping Routine
This worm drops the following files:
- %User Temp%\~ip.tmp
(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 worm connects to the following possibly malicious URL:
- http://iozisu.{BLOCKED}p.jp:8536/po.php
- http://www.{BLOCKED}myip.com/automation/n09230945.asp
- http://checkip.{BLOCKED}s.org/?{random characters}
- http://iozisu.{BLOCKED}p.jp:8536/limp.gif
- http://vnyiu.{BLOCKED}e.hm:49872/limp.gif
- http://rttr.{BLOCKED}atama.com:88/limp.gif
- {BLOCKED}7.19.236
- {BLOCKED}1.120.14
- {BLOCKED}6.39.70
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.700
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
Identify and delete files detected as WORM_RENOCIDE.YY using either the Startup Disk or Recovery Console
Step 3
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\Microsoft\DRM
- amty
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\policies\Explorer
- Run
Step 4
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\DRM\amty
- ilop = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- csrcs = "%System%\csrcs.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- fix1 = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- exp1 = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- dreg = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM\amty
- regexp = "0.0839594367418485"
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Shell = "Explorer.exe csrcs.exe"
To: Shell = ""Explorer.exe""
- From: Shell = "Explorer.exe csrcs.exe"
Step 6
Search and delete this file
- %User Temp%\~ip.tmp
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_RENOCIDE.YY. 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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