Win32/Trustezeb [Threat Name] go to Threat

Win32/Trustezeb.K [Threat Variant Name]

Category trojan
Size 179712 B
Detection created Nov 27, 2014
Detection database version 10789
Aliases Backdoor.Win32.Matsnu.amx (Kaspersky)
Short description

The trojan serves as a backdoor. It can be controlled remotely.

Installation

When executed, the trojan copies itself in some of the the following locations:

  • %temp%\­%variable1%-%variable3%\­%variable1%-%variable4%
  • %appdata%\­%variable1%-%variable3%\­%variable1%-%variable4%
  • %localappdata%\­%variable1%-%variable3%\­%variable1%-%variable4%

In order to be executed on every system start, the trojan sets the following Registry entries:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "%variable1%-%variable2%" = "%installfolder%\­%variable1%-%variable3%\­%variable1%-%variable4%"
  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­RunOnce]
    • "%variable1%-%variable2%" = "%malwarefilepath%"

The %variable1% is one of the following strings:

  • abuse
  • accept
  • access
  • according
  • account
  • accuse
  • achieve
  • acquire
  • act
  • adapt
  • add
  • address
  • adjust
  • admire
  • admit
  • adopt
  • advance
  • advanced
  • advantage
  • affect
  • afford
  • age
  • agree
  • air
  • alarm
  • allow
  • amazing
  • amount
  • anger
  • angle
  • announce
  • answer
  • anticipate
  • apologize
  • appeal
  • appear
  • apply
  • appreciate
  • approach
  • appropriate
  • approve
  • are
  • argue
  • arise
  • arm
  • arrive
  • ask
  • assist
  • associate
  • assume
  • assure
  • attach
  • attack
  • attempt
  • attend
  • attract
  • author
  • average
  • avoid
  • award
  • baby
  • bag
  • bake
  • balance
  • ball
  • band
  • bank
  • bar
  • base
  • bat
  • bath
  • battle
  • be
  • beach
  • bear
  • beat
  • become
  • bed
  • been
  • begin
  • behave
  • being
  • believe
  • bell
  • belong
  • belt
  • bench
  • bend
  • benefit
  • bet
  • bicycle
  • bid
  • bike
  • bill
  • birth
  • bit
  • bite
  • black
  • blame
  • blank
  • blind
  • block
  • blow
  • blue
  • board
  • boat
  • body
  • bone
  • book
  • boot
  • border
  • born
  • borrow
  • boss
  • bother
  • bottle
  • bottom
  • bowl
  • box
  • brain
  • branch
  • break
  • breakfast
  • breast
  • brick
  • bridge
  • bring
  • brush
  • buddy
  • bug
  • build
  • building
  • bunch
  • burn
  • bus
  • busy
  • button
  • buy
  • cable
  • cake
  • calculate
  • calendar
  • call
  • camp
  • campaign
  • cancel
  • candidate
  • candle
  • candy
  • cap
  • card
  • care
  • career
  • carpet
  • carry
  • case
  • cash
  • cat
  • catch
  • cause
  • celebrate
  • chain
  • chair
  • challenge
  • champion
  • change
  • channel
  • charge
  • chart
  • check
  • chip
  • choose
  • claim
  • class
  • clerk
  • click
  • clock
  • closed
  • closet
  • cloud
  • club
  • clue
  • coach
  • coast
  • coat
  • code
  • collar
  • collect
  • combine
  • come
  • comfort
  • command
  • comment
  • commission
  • commit
  • communicate
  • company
  • compare
  • compete
  • complain
  • complete
  • complicated
  • concentrate
  • concern
  • concerned
  • concert
  • condition
  • conference
  • confirm
  • conflict
  • connect
  • consider
  • consist
  • consult
  • contact
  • contain
  • content
  • contest
  • continue
  • contribute
  • convert
  • convince
  • cook
  • copy
  • correct
  • cost
  • count
  • counter
  • couple
  • course
  • court
  • cover
  • cow
  • crack
  • craft
  • crash
  • cream
  • create
  • credit
  • crew
  • criticize
  • cross
  • cry
  • culture
  • cup
  • curve
  • cut
  • cycle
  • damage
  • dance
  • dare
  • date
  • deal
  • decide
  • delay
  • deliver
  • demand
  • depend
  • deposit
  • describe
  • deserve
  • design
  • desire
  • destroy
  • detail
  • detailed
  • determine
  • develop
  • devil
  • die
  • diet
  • differ
  • dig
  • dimension
  • dirty
  • disagree
  • disappointed
  • discipline
  • discount
  • discover
  • discuss
  • dish
  • display
  • distance
  • distribute
  • district
  • divide
  • doctor
  • document
  • does
  • dog
  • dot
  • doubt
  • draft
  • drag
  • draw
  • dream
  • drink
  • drive
  • drop
  • dry
  • dump
  • dust
  • earn
  • earth
  • ease
  • eat
  • edge
  • effect
  • egg
  • emphasize
  • employ
  • empty
  • enable
  • encourage
  • encouraging
  • end
  • engage
  • engineer
  • enhance
  • enjoy
  • ensure
  • enter
  • entrance
  • escape
  • essay
  • establish
  • estimate
  • even
  • evidence
  • exact
  • examine
  • example
  • exchange
  • excuse
  • exercise
  • exist
  • exit
  • expand
  • expect
  • experience
  • experienced
  • explain
  • explore
  • expose
  • express
  • extend
  • eye
  • face
  • factor
  • fail
  • fall
  • fan
  • farm
  • father
  • fault
  • fear
  • feature
  • fee
  • feed
  • feel
  • field
  • fight
  • figure
  • file
  • fill
  • film
  • finance
  • find
  • finger
  • finish
  • fire
  • firm
  • fish
  • fit
  • fix
  • fixed
  • floor
  • flow
  • flower
  • fly
  • focus
  • fold
  • follow
  • foot
  • force
  • forget
  • form
  • frame
  • frequent
  • friend
  • fruit
  • fuel
  • function
  • gain
  • gap
  • garage
  • garden
  • gas
  • gather
  • gear
  • generate
  • get
  • gift
  • give
  • glove
  • go
  • golf
  • grab
  • grade
  • grandfather
  • grass
  • ground
  • group
  • grow
  • guarantee
  • guard
  • guess
  • guide
  • guy
  • habit
  • hand
  • handle
  • hang
  • happen
  • harm
  • has
  • hate
  • have
  • hear
  • heat
  • help
  • hesitate
  • hide
  • highlight
  • hire
  • hit
  • hold
  • hole
  • hook
  • hope
  • horse
  • host
  • hunt
  • hurry
  • hurt
  • husband
  • ice
  • identify
  • ignore
  • illustrate
  • image
  • imagine
  • impact
  • implement
  • imply
  • impress
  • improve
  • include
  • incorporate
  • increase
  • indicate
  • influence
  • inform
  • insist
  • install
  • intend
  • interest
  • interested
  • interview
  • introduce
  • invest
  • investigate
  • invite
  • involve
  • involved
  • iron
  • is
  • island
  • isp
  • israel
  • israeli
  • issn
  • issue
  • issued
  • issues
  • ist
  • istanbul
  • it
  • italia
  • italian
  • italiano
  • italic
  • italy
  • item
  • items
  • its
  • itsa
  • itself
  • itunes
  • iv
  • ivory
  • ix
  • j
  • ja
  • jack
  • jacket
  • jackets
  • jackie
  • jackson
  • jacksonville
  • jacob
  • jade
  • jaguar
  • jail
  • jake
  • jam
  • jamaica
  • james
  • jamie
  • jan
  • jane
  • janet
  • january
  • japan
  • japanese
  • jar
  • jason
  • java
  • javascript
  • jay
  • jazz
  • jc
  • jd
  • je
  • jean
  • jeans
  • jeep
  • jeff
  • jefferson
  • jeffrey
  • jelsoft
  • jennifer
  • jenny
  • jeremy
  • jerry
  • jersey
  • jerusalem
  • jesse
  • jessica
  • jesus
  • jet
  • jets
  • jewel
  • jewellery
  • jewelry
  • jewish
  • jews
  • jill
  • jim
  • jimmy
  • jj
  • jm
  • jo
  • joan
  • job
  • jobs
  • joe
  • joel
  • john
  • johnny
  • johns
  • johnson
  • johnston
  • join
  • joined
  • joining
  • joins
  • joint
  • joke
  • jokes
  • jon
  • jonathan
  • jones
  • jordan
  • jose
  • joseph
  • josh
  • joshua
  • journal
  • journalism
  • journalist
  • journalists
  • journals
  • journey
  • joy
  • joyce
  • jp
  • jpeg
  • jpg
  • jr
  • js
  • juan
  • judge
  • judges
  • judgment
  • judicial
  • judy
  • juice
  • jul
  • julia
  • julian
  • julie
  • july
  • jump
  • jumping
  • jun
  • junction
  • june
  • jungle
  • junior
  • junk
  • jurisdiction
  • jury
  • just
  • justice
  • justify
  • justin
  • juvenile
  • jvc
  • k
  • ka
  • kai
  • kansas
  • karaoke
  • karen
  • karl
  • karma
  • kate
  • kathy
  • katie
  • katrina
  • kay
  • kazakhstan
  • kb
  • kde
  • keen
  • keep
  • keeping
  • keeps
  • keith
  • kelkoo
  • kelly
  • ken
  • kennedy
  • kenneth
  • kenny
  • keno
  • kent
  • kentucky
  • kenya
  • kept
  • kernel
  • kerry
  • kevin
  • key
  • keyboard
  • keyboards
  • keys
  • keyword
  • keywords
  • kg
  • kick
  • kid
  • kidney
  • kids
  • kijiji
  • kill
  • killed
  • killer
  • killing
  • kills
  • kilometers
  • kim
  • kinase
  • kind
  • kinda
  • kinds
  • king
  • kingdom
  • kings
  • kingston
  • kirk
  • kiss
  • kissing
  • kit
  • kitchen
  • kits
  • kitty
  • klein
  • km
  • knee
  • knew
  • knife
  • knight
  • knights
  • knit
  • knitting
  • knives
  • knock
  • know
  • knowing
  • knowledge
  • knowledgestorm
  • known
  • knows
  • ko
  • kodak
  • kong
  • korea
  • korean
  • kruger
  • ks
  • kurt
  • kuwait
  • kw
  • ky
  • kyle
  • l
  • la
  • lab
  • label
  • labeled
  • labels
  • labor
  • laboratories
  • laboratory
  • labour
  • labs
  • lace
  • lack
  • ladder
  • laden
  • ladies
  • lady
  • lafayette
  • laid
  • lake
  • lakes
  • lamb
  • lambda
  • lamp
  • lamps
  • lan
  • lancaster
  • lance
  • land
  • landing
  • lands
  • landscape
  • landscapes
  • lane
  • lanes
  • lang
  • language
  • languages
  • lanka
  • lap
  • laptop
  • laptops
  • large
  • largely
  • larger
  • largest
  • larry
  • las
  • laser
  • last
  • lasting
  • lat
  • late
  • lately
  • later
  • latest
  • latex
  • latin
  • latina
  • latinas
  • latino
  • latitude
  • latter
  • latvia
  • lauderdale
  • laugh
  • laughing
  • launch
  • launched
  • launches
  • laundry
  • laura
  • lauren
  • law
  • lawn
  • lawrence
  • laws
  • lawsuit
  • lawyer
  • lawyers
  • lay
  • layer
  • layers
  • layout
  • lazy
  • lb
  • lbs
  • lc
  • lcd
  • ld
  • le
  • lead
  • leader
  • leaders
  • leadership
  • leading
  • leads
  • leaf
  • league
  • lean
  • learn
  • learned
  • learners
  • learning
  • lease
  • leasing
  • least
  • leather
  • leave
  • leaves
  • leaving
  • lebanon
  • lecture
  • lectures
  • led
  • lee
  • leeds
  • left
  • leg
  • legacy
  • legal
  • legally
  • legend
  • legendary
  • legends
  • legislation
  • legislative
  • legislature
  • legitimate
  • legs
  • leisure
  • lemon
  • len
  • lender
  • lenders
  • lending
  • length
  • lens
  • lenses
  • leo
  • leon
  • leonard
  • leone
  • les
  • lesbian
  • lesbians
  • leslie
  • less
  • lesser
  • lesson
  • lessons
  • let
  • lets
  • letter
  • letters
  • letting
  • leu
  • level
  • levels
  • levitra
  • levy
  • lewis
  • lexington
  • lexmark
  • lexus
  • lf
  • lg
  • li
  • liabilities
  • liability
  • liable
  • lib
  • liberal
  • liberia
  • liberty
  • librarian
  • libraries
  • library
  • libs
  • licence
  • license
  • licensed
  • licenses
  • licensing
  • licking
  • lid
  • lie
  • liechtenstein
  • lies
  • life
  • lifestyle
  • lifetime
  • lift
  • light
  • lighter
  • lighting
  • lightning
  • lights
  • lightweight
  • like
  • liked
  • likelihood
  • likely
  • likes
  • likewise
  • lil
  • lime
  • limit
  • limitation
  • limitations
  • limited
  • limiting
  • limits
  • limousines
  • lincoln
  • linda
  • lindsay
  • line
  • linear
  • lined
  • lines
  • lingerie
  • link
  • linked
  • linking
  • links
  • linux
  • lion
  • lions
  • lip
  • lips
  • liquid
  • lisa
  • list
  • listed
  • listen
  • listening
  • listing
  • listings
  • listprice
  • lists
  • lit
  • lite
  • literacy
  • literally
  • literary
  • literature
  • lithuania
  • litigation
  • little
  • live
  • livecam
  • lived
  • liver
  • liverpool
  • lives
  • livesex
  • livestock
  • living
  • liz
  • ll
  • llc
  • lloyd
  • llp
  • lm
  • ln
  • lo
  • load
  • loaded
  • loading
  • loads
  • loan
  • loans
  • lobby
  • loc
  • local
  • locale
  • locally
  • locate
  • located
  • location
  • locations
  • locator
  • lock
  • locked
  • locking
  • locks
  • lodge
  • lodging
  • log
  • logan
  • logged
  • logging
  • logic
  • logical
  • login
  • logistics
  • logitech
  • logo
  • logos
  • logs
  • lol
  • lolita
  • london
  • lone
  • lonely
  • long
  • longer
  • longest
  • longitude
  • look
  • looked
  • looking
  • looks
  • looksmart
  • lookup
  • loop
  • loops
  • loose
  • lopez
  • lord
  • los
  • lose
  • losing
  • loss
  • losses
  • lost
  • lot
  • lots
  • lottery
  • lotus
  • lou
  • loud
  • louis
  • louise
  • louisiana
  • louisville
  • lounge
  • love
  • loved
  • lovely
  • lover
  • lovers
  • loves
  • loving
  • low
  • lower
  • lowest
  • lows
  • lp
  • ls
  • lt
  • ltd
  • lu
  • lucas
  • lucia
  • luck
  • lucky
  • lucy
  • luggage
  • luis
  • luke
  • lunch
  • lung
  • luther
  • luxembourg
  • luxury
  • lycos
  • lying
  • lynn
  • lyric
  • lyrics
  • m
  • ma
  • mac
  • macedonia
  • machine
  • machinery
  • machines
  • macintosh
  • macro
  • macromedia
  • mad
  • madagascar
  • made
  • madison
  • madness
  • madonna
  • madrid
  • mae
  • mag
  • magazine
  • magazines
  • magic
  • magical
  • magnet
  • magnetic
  • magnificent
  • magnitude
  • mai
  • maiden
  • mail
  • mailed
  • mailing
  • mailman
  • mails
  • mailto
  • main
  • maine
  • mainland
  • mainly
  • mainstream
  • maintain
  • maintained
  • maintaining
  • maintains
  • maintenance
  • major
  • majority
  • make
  • maker
  • makers
  • makes
  • makeup
  • making
  • malawi
  • malaysia
  • maldives
  • male
  • males
  • mali
  • mall
  • malpractice
  • malta
  • mambo
  • man
  • manage
  • managed
  • management
  • manager
  • managers
  • managing
  • manchester
  • mandate
  • mandatory
  • manga
  • manhattan
  • manitoba
  • manner
  • manor
  • manual
  • manually
  • manuals
  • manufacture
  • manufactured
  • manufacturer
  • manufacturers
  • manufacturing
  • many
  • map
  • maple
  • mapping
  • maps
  • mar
  • marathon
  • marble
  • marc
  • march
  • marco
  • marcus
  • mardi
  • margaret
  • margin
  • maria
  • mariah
  • marie
  • marijuana
  • marilyn
  • marina
  • marine
  • mario
  • marion
  • maritime
  • mark
  • marked
  • marker
  • markers
  • market
  • marketing
  • marketplace
  • markets
  • marking
  • marks
  • marriage
  • married
  • marriott
  • marry
  • mars
  • marshall
  • mart
  • martha
  • martial
  • martin
  • marvel
  • mary
  • maryland
  • mas
  • mask
  • mason
  • mass
  • massachusetts
  • massage
  • massive
  • master
  • mastercard
  • masters
  • masturbating
  • masturbation
  • mat
  • match
  • matched
  • matches
  • matching
  • mate
  • material
  • materials
  • maternity
  • math
  • mathematical
  • mathematics
  • mating
  • matrix
  • mats
  • matt
  • matter
  • matters
  • matthew
  • mattress
  • mature
  • maui
  • mauritius
  • max
  • maximize
  • maximum
  • may
  • maybe
  • mayor
  • mazda
  • mb
  • mba
  • mc
  • mcdonald
  • mean
  • meet
  • mention
  • mess
  • metal
  • milk
  • mind
  • mirror
  • miss
  • mistake
  • mix
  • mixed
  • model
  • monitor
  • months
  • montreal
  • mood
  • moon
  • moore
  • moral
  • more
  • moreover
  • morgan
  • morning
  • morocco
  • morris
  • morrison
  • mortality
  • mortgage
  • mortgages
  • moscow
  • moses
  • moss
  • most
  • mostly
  • motel
  • motels
  • mother
  • motherboard
  • mothers
  • motion
  • motivated
  • motivation
  • motor
  • motorcycle
  • motorcycles
  • motorola
  • motors
  • mount
  • mountain
  • mountains
  • mounted
  • mounting
  • mounts
  • mouse
  • mouth
  • move
  • moved
  • movement
  • movements
  • movers
  • moves
  • movie
  • movies
  • moving
  • mozambique
  • mozilla
  • mp
  • mpeg
  • mpegs
  • mpg
  • mph
  • mr
  • mrna
  • mrs
  • ms
  • msg
  • msgid
  • msgstr
  • msie
  • msn
  • mt
  • mtv
  • mu
  • much
  • mud
  • mug
  • multi
  • multimedia
  • multiple
  • mumbai
  • munich
  • municipal
  • municipality
  • murder
  • murphy
  • murray
  • muscle
  • muscles
  • museum
  • museums
  • music
  • musical
  • musician
  • musicians
  • muslim
  • muslims
  • must
  • mustang
  • mutual
  • muze
  • mv
  • mw
  • mx
  • my
  • myanmar
  • myers
  • myrtle
  • myself
  • mysimon
  • myspace
  • mysql
  • mysterious
  • mystery
  • myth
  • n
  • na
  • nail
  • nails
  • naked
  • nam
  • name
  • named
  • namely
  • names
  • namespace
  • namibia
  • nancy
  • nano
  • naples
  • narrative
  • narrow
  • nasa
  • nascar
  • nasdaq
  • nashville
  • nasty
  • nat
  • nathan
  • nation
  • national
  • nationally
  • nations
  • nationwide
  • native
  • nato
  • natural
  • naturally
  • naturals
  • nature
  • naughty
  • nav
  • naval
  • navigate
  • navigation
  • navigator
  • navy
  • nb
  • nba
  • nbc
  • nc
  • ncaa
  • nd
  • ne
  • near
  • nearby
  • nearest
  • nearly
  • nebraska
  • nec
  • necessarily
  • necessary
  • necessity
  • neck
  • necklace
  • need
  • needed
  • needle
  • needs
  • negative
  • negotiate
  • negotiation
  • negotiations
  • neighbor
  • neighborhood
  • neighbors
  • neil
  • neither
  • nelson
  • neo
  • neon
  • nepal
  • nerve
  • nervous
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The %variable2-4% is one of the following strings:

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  • restaurant
  • result
  • review
  • revolution
  • reward
  • rice
  • risk
  • river
  • rock
  • room
  • routine
  • row
  • ruin
  • rule
  • safety
  • salad
  • salary
  • sale
  • salt
  • sand
  • sandwich
  • satisfaction
  • saving
  • scale
  • schedule

The trojan launches the following processes:

  • utilman.exe
  • dwwin.exe
  • grpconv.exe
  • w32tm.exe
  • gpupdate.exe
  • eventcreate.exe

The trojan creates and runs a new thread with its own code within these running processes.


After the installation is complete, the trojan deletes the original executable file.

Information stealing

The trojan collects the following information:

  • user name
  • computer name
  • video controller type
  • operating system version
  • language settings
  • CPU information
  • list of disk devices and their type
  • installed antivirus software
  • information about the operating system and system settings

The trojan attempts to send gathered information to a remote machine.

Other information

The trojan acquires data and commands from a remote computer or the Internet.


The trojan generates various URL addresses. The HTTP protocol is used.


It can execute the following operations:

  • download files from a remote computer and/or the Internet
  • run executable files
  • update itself to a newer version
  • shut down/restart the computer
  • send the list of running processes to a remote computer
  • send the list of files on a specific drive to a remote computer

The trojan displays a fake error message:

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