1. Symantec-Broadcom-Horizontal/
  2. Security Response/
  3. Attack Signatures/
  4. HTTP Gammima Communication

HTTP Gammima Communication

Severity: High

This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.


This signature detects activities of Security Risk W32.Gammima.AG.

Additional Information

When the worm executes, it creates the following files:

* %System%\kavo.exe
* %System%\kavo0.dll

The file kavo0.dll is then injected into all running processes.

It also creates the following file, which is a copy of Hacktool.Rootkit:

The worm then copies itself to all drives from C through Z as the following file:
[DRIVE LETTER]:\ntdelect.com

It also creates the following file so that it executes whenever the drive is accessed:
[DRIVE LETTER]:\autorun.inf

Next, the worm creates the following registry entry so that it executes whenever Windows starts:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"kava" = "%System%\kavo.exe"

It then modifies the following registry entries:

* HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL\"CheckedValue" = "0"
* HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"Hidden" = "2"
* HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"ShowSuperHidden" = "0"
* HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Pocilies\Explorer\"NoDriveTypeAutoRun" = "0x91"

The worm checks if it has been injected into any of the following processes:

* zhengtu.dat
* elementclient.exe
* dekaron.exe
* hyo.exe
* wsm.exe and ybclient.exe
* fairlyclient.exe
* so3d.exe
* maplestory.exe
* r2client.exe
* InphaseNXD.EXE

It then attempts to steal sensitive information for the following online games:

* ZhengTu
* Wanmi Shijie or Perfect World
* Dekaron Siwan Mojie
* HuangYi Online
* Rexue Jianghu
* Seal Online
* Maple Story
* R2 (Reign of Revolution)
* Talesweaver

The worm ends the Matrix Password process if it finds a dialog box with the following characteristics:
Title: MatrixPasswordDlg
Message: Warning! (In Chinese characters)

The harvested information is then sent to the remote attacker via HTTP.


  • Windows 98
  • Windows 95
  • Windows XP
  • Windows Me
  • Windows NT
  • Windows Server 2003
  • Windows 2000


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

1. Disable System Restore (Windows Me/XP).
2. Update the virus definitions.
3. Run a full system scan.
4. Delete any values added to the registry.
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