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Examples of the Most Damaging Malware
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All malware is bad, but some types of malware do
more damage than others. That damage can range
from loss of files to total loss of security
even outright identity theft.
1.Overwriting Viruses 2.Ransomware
Trojans 3.Password Stealers
4.Keyloggers 5.Backdoors 6.Rootkits 7.Bootkits
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data from harmful malware. Activate your MacAfee
antivirus by going through with
mcfee.com/activate.
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1.Overwriting Viruses
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Some viruses deliver a payload that causes
certain types of files to be deleted sometimes
even the entire drive contents. But as bad as
that sounds, if you act quickly the odds are good
you'll recover the deleted files. Overwriting
viruses, however, write over the original file
with their own information. Because the file has
been modified or replaced, it can't be recovered.
Overwriting viruses tend to be rare their own
damage is responsible for their shorter lifespan.
Loveletter is one of the better-known examples of
malware that included an overwriting payload.?
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2.Ransomware Trojans
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Ransomware trojans encrypt data files on the
infected system, then demand money from the
victims in exchange for the decryption key. This
type of malware adds insult to injury not only
do you lose access to your own important files,
but you also become victim to extortion. Pgpcoder 
is perhaps the best-known example of a ransomware
trojan.
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3.Password Stealers
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Password-stealing Trojans harvest login
credentials for systems, networks, FTP accounts,
email, games, as well as banking and e-commerce
sites. Many password stealers can be repeatedly
custom-configured by attackers after they've
infected the system. For example, the same
password-stealing Trojan infection could first
harvest login details for email and FTP, then a
new con fig file sent to the system which causes
it to turn attention to harvesting login
credentials from online banking sites. Password
stealers that target online games are perhaps the
most commonly talked about, but by no means are
games the most common target.
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4.Keyloggers
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In its simplest form, a keylogger trojan monitors
your keystrokes, logging them to a file and
sending them off to remote attackers. Some
keyloggers are sold as commercial software the
type parents might use to record their children's
online activities or a suspicious spouse might
install to keep tabs on his or her
partner. Keyloggers may record all keystrokes,
or they may be sophisticated enough to monitor
for a specific activity like opening a web
browser pointing to your online banking site.
When the desired behavior is observed, the
keylogger goes into record mode, capturing your
login username and password.
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5.Backdoors
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Backdoor trojans provide remote, surreptitious
access to infected systems. Put another way, it's
the virtual equivalent of having the attacker
sitting at your keyboard. A backdoor trojan can
allow the attacker to take any action you, as the
logged-in user, would normally be able to take.
Using this backdoor, the attacker can also upload
and install additional malware, including
password stealers and keyloggers.
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6.Rootkits
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A rootkit gives attackers full access to the
system (hence the term root) and typically hides
the files, folders, registry edits, and other
components it uses. In addition to hiding itself,
a rootkit typically hides other files that it may
be bundled with. The Storm worm is one example of
rootkit-enabled malware.
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7.Bootkits
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While thought to be more theory than practice,
this form of hardware targeting malware is
perhaps the most concerning. Bootkits infect
flash BIOS, causing the malware to be loaded even
prior to the OS. Combined with rootkit
functionality, the hybrid bootkit can be near
impossible for the casual observer to detect,
much less to remove.
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The Best Defense
Routinely scan your computer for malware and
take appropriate steps to protect yourself,
including Using strong passwords that don't
repeat across sites Installing anti-malware
software and keeping it updated Regularly
installing security patches for your computer's
operating system Don't click suspicious links in
email or on websites
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