A remote administration utility which bypasses normal security mechanisms to secretly control a program, computer or network.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
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Hupigon variants are backdoor programs, which provide an attacker with access to, and control of, an infected machine. There are a large number of variants in the Hupigon family.
The backdoor's file is a PE executable. The file may be packed with UPX. Unpacked, the code size is 710kB. It is very rare for a Hupigon variant to be smaller than 299kB.
Hupigons are written with Borland Delphi.
The following text strings can typically be found in a Hupigon variant:
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 uses the following processes to make itself to look like a valid Windows program:
It also makes a number of additions to the registry.
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
Hupigon doesn't have any automatic mechanisms to spread itself. 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.
Creating Hupigon Variants
Hupigon variants are created using kit software. The kit 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 adding a URL to target for a Distributed Denial of Service (DDoS) attack:
The kit as default settings to create mutexes. Many Hupigon variants therefore create mutexes in the following format:
The "xxx" being a variable, for example: Hacker.com.cn_MUTEX
Creates these keys:
- HKLM\System\CurrentControlSet\Services\system32 ImagePath = C:\WINDOWS\Hacker.com.cn.exe