Worm.Win32.Grexon
Grexon is local area network (LAN) worm. In copies itself to logical drives (local and network), as well as encodes network resources where it copies itself. The worm file size is about 7KB.
When the worm is run it copies itself to the Windows temporary directory under the name "grex.exe" and registers this file in the system registry auto-run key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Grex = %TempDir%\grex.exe
While infecting drives (logical and network) the worm copies itself to them under the following names:
NOPE.EXE : to Windows Startup directory
(if exists)
REGEDIT.EXE : to Windows directory (if exists)
While infecting network drives the worm affects their following resources:
\C$
\D$
\IPC$
In case the victim resource is not open for full access the worm tries to connect to it with a password:
user name
the strings "123", "111", "12345", "00"
cached Windows passwords
strgins found in registry keys:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Network\LanMan
Payload
When this worm is run from the REGEDIT.EXE file it displays the
message:
LOADER ERROR
File corrupted !
Depending on a random counter the worm either:
exits Windows
displays the message:
ERROR
Kernel data corrupted !
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