BKDR_IRCBOT.CJC
Windows 2000, Windows, XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This backdoor 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 the initially executed copy of itself.
TECHNICAL DETAILS
620,544 bytes
EXE
Yes
09 Dec 2011
Arrival Details
This backdoor 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 backdoor drops the following copies of itself into the affected system:
- %Windows%\system\wmisvr.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It drops the following files:
- %System%\drivers\sysdrv32.sys
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Autostart Technique
This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_WMISRV\
0000
Service = "WMISRV"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WMISRV
ImagePath = "%Windows%\system\wmisvr.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WMISRV
DisplayName = "WMI Servicer"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_WMISRV
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_WMISRV\
0000
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WMISRV
Other Details
This backdoor connects to the following possibly malicious URL:
- sec.{BLOCKED}icofskorea.info
It deletes the initially executed copy of itself