HELOAG
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Downloaded from the Internet
HELOAG is a family of backdoors. Spotted in 2010, HELOAG comes as a downloaded file from two specific sites.
HELOAG connects to a server and performs commands issued from the server. It connects to different IP addresses, depending on what the IP address the server feeds HELOAG.
TECHNICAL DETAILS
Yes
Connects to URLs/IPs
Installation
This backdoor drops the following copies of itself into the affected system:
- %Windows%\ThunderUpdate.exe
- %Windows%\csrse.exe
- %Windows%\conme.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
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_SSDT_TOOL\
0000
Service = "SSDT_TOOL"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SSDT_TOOL
ImagePath = "\??\{malware path}\SSDT_TOOL.sys"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SSDT_TOOL
DisplayName = "SSDT_TOOL"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SSDT_TOOL\Security
Security = "{hex values}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SSDT_TOOL\Enum
0 = "Root\LEGACY_SSDT_TOOL\0000"
It 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 %Windows%\ThunderUpdate.exe"
(Note: The default value data of the said registry entry is Explorer.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe %Windows%\csrse.exe"
(Note: The default value data of the said registry entry is Explorer.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe %Windows%\conme.exe asds"
(Note: The default value data of the said registry entry is Explorer.exe.)
Other System Modifications
This backdoor adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden
UncheckedValue = "0"
(Note: The default value data of the said registry entry is 1.)
Other Details
This backdoor connects to the following possibly malicious URL:
- cnc{BLOCKED}e.ln.cn
- {BLOCKED}.{BLOCKED}.130.247
- http://www.{BLOCKED}m.com/reques0.asp?kind=020&mac={data}&key={random}