I-Worm.Mydoom.g spreads via the Internet as an attachment to infected messages. The worm itself is a Windows PE EXE file of 32256 bytes, packed using UPX.

I-Worm.Mydoom.g will be launched only if the user opens the archive and executes the infected file. The worm will then install itself to the system and start propagating.

The worm includes a backdoor function, and is also coded to conduct a DoS attack on www.symantec.com and symantec.com

Once the file has been unpacked, the following text string is visible:

to netsky's creator(s): imho, skynet is a decentralized peer-to-peer neural network. we have seen P2P in Slapper in Sinit only. they may be called skynets, but not your shitty app.

Once the worm is launched, it may open Windows Notepad, which will display a random selection of characters.

When installing, the worm copies itself under a random name, with the extension .exe or .scr to the Windows system directory. It registers this file in the system registry to ensure that the worm is launched each time Windows is started:

[HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
 "<random characters>"="%System%\<name of file>"

The worm creates a file with a random name and a .dll extension in the Windows system directory. This is the backdoor component. This file is also registered in the system registry:

[HKCR\CLSID\{E6FB5E20-DE35-11CF-9C87-00AA005127ED}\InProcServer32]
 "<random characters>"="%System%\<name of file.dll>"

This ensures that the DLL is launched as an Explorer.exe child process.

To flag its presence in the system, the worm creates a mutex <name of computer>theta,. This ensures that only one copy of the worm can be launched at once.

The worm copies itself to all accessible hard disks under a random name; it also creates copies of itself in ZIP archives.

It searches all accessible hard drives for files with the extensions listed below. It then creates copies of itself under these file names, adding either an .exe or a .pif extension.

avi
doc
jpg
mp3
mp4
wav
wma
xls

The mass mailing function is similar to the other versions of Mydoom, with a few insignificant differences.

The worm opens TCP ports 80 and 1080 to receive commands. The backdoor component can act as a proxy server, and also download and launch files.

The worm is coded to detect and terminate the following processes in memory:

adaware.exe
alevir.exe
arr.exe
au.exe
avpupd
avwupd
backweb.exe
bargains.exe
beagle
belt.exe
blss.exe
bootconf.exe
bpc.exe
brasil.exe
bundle.exe
bvt.exe
cfd.exe
click
cmd32.exe
cmesys.exe
d3du
datemanager.exe
dcomx.exe
divx.exe
dllcache.exe
dllreg.exe
dpps2.exe
dssagent.exe
emsw.exe
explore.exe
fsg_4104.exe
fuck
gator.exe
gmt.exe
hbinst.exe
hbsrv.exe
hotactio
hotfix.exe
hotpatch.exe
htpatch.exe
hxdl.exe
hxiul.exe

idle.exe
iedll.exe
iedriver.exe
iexplorer.exe
inetlnfo.exe
infus.exe
infwin.exe
init.exe
intdel.exe
intren
isass.exe
istsvc.exe
jdbgmrg.exe
kazza.exe
keenvalue.exe
kernel32.exe
launcher.exe
lnetinfo.exe
loader.exe
mapisvc32.exe
md.exe
mfin32.exe
mmod.exe
mostat.exe
msapp.exe
msbb.exe
msblast.exe
mscache.exe
msccn32.exe
mscman.exe
msdm.exe
msdos.exe
msiexec16.exe
mslaugh.exe
msmgt.exe
msmsgri32.exe
msrexe.exe
mssys.exe
msvxd.exe
netd32.exe
nssys32.exe
nstask32.exe

nsupdate.exe
onsrvr.exe
optimize.exe
patch.exe
penis
pgmonitr.exe
porn
powerscan.exe
prizesurfer.exe
prmt.exe
prmvr.exe
pussy
ray.exe
rb32.exe
rcsync.exe
reged
run32dll.exe
rundll.exe
rundll16.exe
ruxdll32.exe
sahagent.exe
save.exe
savenow.exe
sc.exe
scam32.exe
scrsvr.exe
scvhost.exe
service.exe
servlce.exe
servlces.exe
showbehind.exe
sms.exe
smss32.exe
soap.exe
sperm
spoler.exe
spoolcv.exe
spoolsv32.exe
srng.exe
ssgrate.exe
start.exe
stcloader.exe

support.exe
svc.exe
svchostc.exe
svchosts.exe
svshost.exe
system.exe
system32.exe
sysupd.exe
taskmg
taskmo
teekids.exe
trickler.exe
tsadbot.exe
tvmd.exe
tvtmd.exe
updat
upgrad
utpost.
webdav.exe
win32.exe
win32us.exe
winactive.exe
win-bugsfix.exe
window.exe
windows.exe
wininetd.exe
wininit.exe
wininitx.exe
winlogin.exe
winmain.exe
winnet.exe
winppr32.exe
winservn.exe
winssk32.exe
winstart.exe
winstart001.exe
wintsk32.exe
winupdate.exe
wkufind
wnad.exe
wupdater.exe
wupdt.exe

The worm searches the victim machine for the file C:\Feedlist. If it detects this file, it will attempt to conduct a DoS attack on www.symantec.com and symantec.com by sending looped multiple GET requests.

I-Worm.Mydoom.g