TROJ_BAYROB.VTL
TrojanSpy:Win32/Nivdort.DI (Microsoft), Mal/Bayrob-C (Sophos), Trojan.Win32.Bayrob (Ikarus), W32/Bayrob.AT!tr (Fortinet)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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.
It does not have any propagation routine.
It does not have any backdoor routine.
As of this writing, the said sites are inaccessible.
It does not have any information-stealing capability.
TECHNICAL DETAILS
385,536 bytes
EXE
Yes
20 Jan 2016
Connects to URLs/IPs, Displays message/message boxes
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 string1}\{random string2}.exe
- %System Root%\{random string1}\{random string3}.exe
- %System Root%\{random string1}\{random string4}.exe <- Deleted afterwards
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It drops the following files:
- %System Root%\{random string1}\{random string5}
- %Windows%\{random string1\{random string5}
- %System Root%\{random string1}\{random string6}
- %System Root%\{random string1}\{random string7}
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It creates the following folders:
- %System Root%\{random string1}
- %Windows%\{random string1}
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It displays the following fake error messages:
Autostart Technique
This Trojan adds and runs the following services:
- Service Name: Upgrade Parental Adaptive Registrar
Display Name: Upgrade Parental Adaptive Registrar
Start Type: SERVICE_AUTO_START
Binary Pathname: %System Root%\{random string1}\{random string2}.exe
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Other System Modifications
This Trojan modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\TrustedInstaller
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\TrustedInstaller
Start = "3"
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Download Routine
This Trojan accesses the following websites to download files:
- http://{hostname}.net/index.php
As of this writing, the said sites are inaccessible.
Information Theft
This Trojan does not have any information-stealing capability.
NOTES:
The {hostname} is generated through concatenating two strings 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
9.800
12.284.05
20 Jan 2016
12.285.00
21 Jan 2016
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
Restart in Safe Mode
Step 4
Disable this malware service
- Upgrade Parental Adaptive Registrar
Step 5
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\TrustedInstaller
- Start = "2"
- Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\TrustedInstaller
- Start = "3"
- Start = "3"
Step 6
Search and delete these folders
- %System Root%\{random string1}
- %Windows%\{random string1}
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BAYROB.VTL. 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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