WORM_IRCBOT.WPHT
RDN/Sdbot.worm!cc (McAfee); Worm:Win32/Phorpiex.B (Microsoft); W32.IRCBot(Symantec)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It bypasses the Windows firewall. This allows the malware to perform its intended routine without being detected by an installed firewall.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
62,464 bytes
EXE
25 Mar 2013
Arrival Details
This Worm arrives via removable drives.
It 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 and executes them:
- %User Profile%\P-7-78-8964-9648-3874\wincrs.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It creates the following folders:
- %User Profile%\P-7-78-8964-9648-3874
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Autostart Technique
This Worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Windows System = "%User Profile%\P-7-78-8964-9648-3874\wincrs.exe"
Other System Modifications
This Worm modifies the following registry entries to disable the Windows Firewall settings:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List\%User Profile%\P-7-78-8964-9648-3874
wincrs.exe = "%User Profile%\P-7-78-8964-9648-3874\wincrs.exe:*:Enabled:Microsoft Windows System"
Propagation
This Worm creates the following folders in all removable drives:
- {removable drive letter}:\69482745
It drops the following copy(ies) of itself in all removable drives:
- {removable drive letter}:\69482745\_TOOLS.exe
- {removable drive letter}:\wincsa.exe
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
Dropping Routine
This Worm drops the following files:
- {removable drive letter}:\_TOOLS.lnk
Other Details
This Worm connects to the following possibly malicious URL:
- {BLOCKED}x.{BLOCKED}cnum.net
SOLUTION
9.850
13.560.04
28 Jul 2017
13.561.00
29 Jul 2017
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Terminate a malware/grayware process
*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.
- %User Profile%\P-7-78-8964-9648-3874\wincrs.exe
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\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%User Profile%\P-7-78-8964-9648-3874
- wincrs.exe = "%User Profile%\P-7-78-8964-9648-3874\wincrs.exe:*:Enabled:Microsoft Windows System"
- wincrs.exe = "%User Profile%\P-7-78-8964-9648-3874\wincrs.exe:*:Enabled:Microsoft Windows System"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Microsoft Windows System = "%User Profile%\P-7-78-8964-9648-3874\wincrs.exe"
- Microsoft Windows System = "%User Profile%\P-7-78-8964-9648-3874\wincrs.exe"
Step 5
Search and delete these folders
- %User Profile%\P-7-78-8964-9648-3874
- {removable drive letter}:\69482745
Step 6
Search and delete this file
- {removable drive letter}:\_TOOLS.lnk
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_IRCBOT.WPHT. 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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