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F-Secure Malware Information Pages: Backdoor:W32/Hupigon
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Summary
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| Backdoor:W32/Hupigon is a family of backdoor trojans. It allows a remote user access to the computer. |
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Detailed Description
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The backdoor's file is a PE executable. It is very rare if the variant is smaller than 299kB. The kit used to make this family of malware has default settings to pack the code as UPX. Unpacked the code size is 710kB. Hupigons are written with Borland Delphi.
When the backdoor's file is started, it copies itself as a file named something similar to "Hacker.com.cn.exe" in the Windows System folder and then creates the following startup key value in the Registry:
- HKLM\System\CurrentControlSet\Services\system32
ImagePath = C:\WINDOWS\Hacker.com.cn.exe
And it creates these keys:
- HKLM\System\CurrentControlSet\Services\system32
- HKLM\System\CurrentControlSet\Services\system32\Security
Overall, Hupigon variants have several different types of features. The following list is an example of some:
- It allows others to access the computer
- Allows for recording with the user's webcam
- Can make the user's computer to attack various servers
- Send victim's computer messages
- Has rootkit functionality so it has a stealth component that hides files
- Create logs from keystrokes, steals passwords, and sends this information to remote servers.
Typically, Hupigon clones itself to some installation path such as system32 and uses the following processes to make itself to look like a valid Windows program:
- calc.exe
- cmd.exe
- mmc.exe
- mspaint.exe
- mstsc.exe
- notepad.exe
- osk.exe
- sndrec.exe
- sndvol32.exe
- svchost.exe
- winchat.exe
The kit that creates Hupigon variants has default settings to create mutexes. So many Hupigons have created mutexes which are in the following format:
The "xxx" being a variable. Example: Hacker.com.cn_MUTEX
The following strings can typically be found in a Hupigon variant:
- 6600.org
- BEI_ZHU
- GrayPigeon
- Hacker.com.cn.exe
- huaihuaitudou
- Rejoice2007
- woainisisi
Hupigon doesn't have any automatic mechanisms to spread itself, so it must be sent by its author via e-mail, through a website, or even via Instant Messengers (IM) such as Yahoo, MSN, ICQ, and Skype.
Hupigon Kit
As noted above, Hupigon variants are created using a kit. This kit software is maintained in a very professional fashion with a highly developed User Interface (UI).
The main UI of the kit can be seen below:
Many options can be set. The "Fast Configuration" shown below enable the following options:
- Service name is rejoice44.exe
- Installation path is Msinfo…
- Password is 1234
- Icon is taken from MS Media Player
- Uses Internet Explorer to bypass firewall
- Create mutex and remove installer from installer folder
- Pack code by using UPX
- Self/auto-clone protected installation path is "system32"
- Executable is calc.exe
There is also a "rootkit" option available.
Other options including URL to DDoS:
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F-Secure Corporation |
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Last Modified: January 02, 2008
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