TROJ_BAYROB.SM9
TrojanSpy:Win32/Nivdort.BI (Microsoft)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan drops the following copies of itself into the affected system and executes them:
- %System Root%\{random folder name}\{random filename 1}.exe
- %System Root%\{random folder name}\{random filename 2}.exe
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It drops the following files:
- %Windows%\{random folder name}\{random filename 3} - deleted after use
- %System Root%\{random folder name}\{random filename 3}
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It creates the following folders:
- %Windows%\{random folder name}
- %System Root%\{random folder name}
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Autostart Technique
This Trojan modifies the following registry entry(ies) to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Registrar Coordinator Adapter Software WLAN = "%System Root%\{random folder name}\{random filename 1}.exe"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{variable}.net/index.php?method&len
where {variable} is a combination of any two words from the following list:
- journey
- destroy
- against
- night
- within
- effort
- street
- better
- husband
- little
- doubt
- decide
- suffer
- through
- trade
- gather
- ridden
- chair
- large
- record
- forget
- would
- flier
- quiet
- belong
- those
- captain
- electric
- increase
- remember
- bread
- season
- degree
- answer
- think
- chief
- order
- leader
- rather
- strange
- forward
- glass
- present
- college
- require
- heaven
- morning
- history
- difficult
- pleasant
- often
- middle
- heavy
- various
- amount
- thick
- heard
- necessary
- alone
- twelve
- gentle
- return
- weather
- class
- movement
- building
- fresh
- gentleman
- fellow
- broken
- summer
- thought
- outside
- evening
- experience
- already
- double
- result
- crowd
- water
- store
- doctor
- follow
- begin
- prepare
- strength
- woman
- party
- might
- pretty
- member
- known
- desire
- still
- smoke
- fight
- expect
- person
- severa
- simple
- figure
- picture
- winter
- finish
- because
- machine
- laugh
- mother
- though
- cigarette
- subject
- leave
- sudden
- whether
- mountain
- perhaps
- children
- either
- sweet
- several
- foreign
- right
- possible
- window
- family
- english
- probably
- material
- shore
- welcome
- dollar
- proud
- should
- industry
- opinion
- contain
- character
- nature
- board
- enough
- supply
- settle
- office
- device
- beyond
- silver
- forever
- valley
- matter
- school
- together
- question
- flower
- bring
- special
- demand
- father
- hunger
- built
- storm
- written
- around
- realize
- complete
- short
- became
- promise
- basket
- ladder
- needle
- enter
- govern
- distance
- language
- arrive
- before
- being
- sister
- bottom
- labor
- spent
- while
- control
- therefore
- minute
- listen
- corner
- shout
- apple
- training
- carry
- thrown
- length
- laughter
- indeed
- consider
- almost
- attempt
- orderly
- neighbor
- clear
- smell
- include
- safety
- chance
- market
- twenty
- beauty
- clean
- ready
- course
- people
- understand
- succeed
- behind
- produce
- stream
- nation
- bottle
- please
- dried
- round
- angry
- likely
- notice
- fancy
- during
- friend
- reason
- square
- value
- spread
- general
- early
- north
- future
- meeting
- report
- understood
- garden
- paint
- brown
- women
- daughter
- broad
- between
- butter
- student
- nothing
- soldier
- divide
- condition
- fifteen
- glossary
- article
- worth
- except
- further
- bicycle
- become
- strong
- found
- president
- success
- wagon
- until
- kitchen
- shoulder
- continue
- airplane
- wonder
- guard
- advance
- station
- goodbye
- object
- measure
- choose
- afraid
- period
- escape
- space
- problem
- yellow
- wheat
- single
- always
- difference
- bridge
- cover
- whose
- company
- trouble
- spring
- caught
- banker
- without
- above
- probable
- finger
- master
- straight
- discover
- fence
- stranger
- third
- fortieth
- childhood
- dinner
- although
- circle
- however
- animal
- travel
- modern
- close
- anger
- charge
- forest
- every
- branch
- separate
- receive
- clothes
- borrow
- toward
- electricity
- million
- honor
- catch
- system
- public
- number
- heart
- strike
- mayor
- manner
- century
- business
- power
- mister
- method
- service
- direct
- instead
- surprise
- bright
- letter
- nearly
- speak
- shake
- write
- believe
- health
- quarter
- distant
- train
- pleasure
- delight
- white
- neither
- eearly
- trust
- dress
- position
- perfect
- partial
- battle
- another
- famous
- appear
- country
- suppose
- action
- river
- brought
- explain
- beside
- inside
- different
- happen
- niece
- share
- oclock
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Scan your computer with your Trend Micro product and note files detected as TROJ_BAYROB.SM9
Step 4
Restart in Safe Mode
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Registrar Coordinator Adapter Software WLAN = "%System Root%\{random folder name}\{random filename 1}.exe"
- Registrar Coordinator Adapter Software WLAN = "%System Root%\{random folder name}\{random filename 1}.exe"
Step 6
Search and delete these folders
- %Windows%\{random folder name}
- %System Root%\{random folder name}
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BAYROB.SM9. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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