Worm.Win32.DOWNAD.PIDB
Worm:Win32/Conficker.C (MICROSOFT)
Windows
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Propagates via software vulnerabilities
This Worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It takes advantage of certain vulnerabilities.
TECHNICAL DETAILS
168,096 bytes
DLL
Yes
Connects to URLs/IPs
Arrival Details
This Worm 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 Worm drops the following files:
- {Drive}\autorun.inf
It drops the following copies of itself into the affected system:
- {Drive}\RECYCLER\{Generated string}\{Random characters}.{Random extension}
- \\{Server host name}\ADMIN$\System32\{Random characters}.{Random extension}
- %Application Data%\{Random characters}.dll
- %Program Files%\Internet Explorer\{Random characters}.dll
- %Program Files%\Movie Maker\{Random characters}.dll
- %System%\{Random characters}.dll
- %System%\{Random characters}.tmp
- %Temp%\{Random characters}.dll
- %Temp%\{Random characters}.tmp
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)
It adds the following processes:
- netsh interface tcp set global autotuning=disabled (Disables TCP/IP auto-tuning if the sample is running on Windows Vista)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- {Random characters}
- Global\{Random characters based on computer name}-7
It injects codes into the following process(es):
- svchost.exe
- explorer.exe
- services.exe (If the sample is running on Windows 2000)
Autostart Technique
This Worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\{Random characters}
DisplayName = {Random string}
HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\{Random characters}
Start = 2
HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\{Random characters}
ImagePath = %SystemRoot%\system32\svchost.exe -k netsvcs
HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\{Random characters}\Parameters
ServiceDll = %System%\{Random characters}.dll
HKEY_CURRENT_USERSoftware\Microsoft\Windows\
CurrentVersion\Run
{Random characters} = rundll32.exe {Malware file name and path}, {Parameter}
Other System Modifications
This Worm adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Applets
dl = 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Applets
ds = 0
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets
dl = 0
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets
ds = 0
It modifies the following registry entries to hide files with Hidden attributes:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = 0
Other Details
This Worm adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\{Random characters}
It connects to the following URL(s) to get the affected system's IP address:
- http://www.getmyip.org
- http://www.whatsmyipaddress.com
- http://www.whatismyip.org
- http://checkip.dyndns.org
It connects to the following time servers to determine the current date:
- ask.com
- yahoo.com
- google.com
- baidu.com
- myspace.com
- msn.com
- ebay.com
- cnn.com
- aol.com
It takes advantage of the following vulnerabilities:
NOTES:
It does the following:
- It patches %System%\drivers\tcpip.sys after loading it in the memory to spread more rapidly across a network.
- It generates a set of domains based on the returned system time. If a domain is active among the generated domains, it formats its response to http://{Address}/search?q={Number} to download files.
- It creates an HTTP server with the format http://{IP address}:{Random port} to propagate over the Internet.
- It deletes all system restore points to disable user from reverting back to a previous system restore point.
- It hooks the following API to avoid the exploitation of the used vulnerability:
- NetpwPathCanonicalize
- It hooks the following API to block user access to certain sites:
- DNS_Query_A
- DNS_Query_UTF8
- DNS_Query_W
- Query_Main
- sendto
- It modifies the following registry entries to execute its copy:
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Svchost
- netsvcs={Old data}, {Appended created malicious service registry entry}
- It adds the following registry entries to spread more rapidly across a network:
- HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
- TcpNumConnections=0x00fffffe
- It creates a scheduled task with the following command on a remote server with brute-forced credentials to execute its copy:
- rundll32.exe {Random characters}.{Random extension}, {Parameter}
- It creates the following named pipe to allow external hosts or local processes to connect and upload a binary:
- \\.\pipe\System_{Computer name}7
- It blocks infected systems from visiting certain sites containing the following strings:
- ccert
- sans
- bit9
- vet
- avg
- avp
- ca
- nai
- windowsupdate
- wilderssecurity
- threatexpert
- castlecops
- spamhaus
- cpsecure
- arcabit
- emsisoft
- sunbelt
- securecomputing
- rising
- prevx
- pctools
- norman
- k7computing
- ikarus
- hauri
- hacksoft
- gdata
- fortinet
- ewido
- clamav
- comodo
- quickheal
- avira
- avast
- esafe
- ahnlab
- centralcommand
- drweb
- grisoft
- eset
- nod32
- f-prot
- jotti
- kaspersky
- f-secure
- computerassociates
- networkassociates
- etrust
- panda
- sophos
- trendmicro
- mcafee
- norton
- symantec
- microsoft
- defender
- rootkit
- malware
- spyware
- virus
- Boot
- Center
- Config
- Driver
- Helper
- Image
- Installer
- Manager
- Microsoft
- Monitor
- Network
- Security
- Server
- Shell
- Support
- System
- Task
- Time
- Universal
- Update
- Windows
- It uses the following credentials to brute-force vulnerable systems:
- 99999999
- 9999999
- 999999
- 99999
- 9999
- 999
- 99
- 9
- 88888888
- 8888888
- 888888
- 88888
- 8888
- 888
- 88
- 8
- 77777777
- 7777777
- 777777
- 77777
- 7777
- 777
- 77
- 7
- 66666666
- 6666666
- 666666
- 66666
- 6666
- 666
- 66
- 6
- 55555555
- 5555555
- 555555
- 55555
- 5555
- 555
- 55
- 5
- 44444444
- 4444444
- 444444
- 44444
- 4444
- 444
- 44
- 4
- 33333333
- 3333333
- 333333
- 33333
- 3333
- 333
- 33
- 3
- 22222222
- 2222222
- 222222
- 22222
- 2222
- 222
- 22
- 2
- 11111111
- 1111111
- 111111
- 11111
- 1111
- 111
- 11
- 1
- 00000000
- 0000000
- 00000
- 0000
- 000
- 00
- 0987654321
- 987654321
- 87654321
- 7654321
- 654321
- 54321
- 4321
- 321
- 21
- 12
- fuck
- zzzzz
- zzzz
- zzz
- xxxxx
- xxxx
- xxx
- qqqqq
- qqqq
- qqq
- aaaaa
- aaaa
- aaa
- sql
- file
- web
- foo
- job
- home
- work
- intranet
- controller
- killer
- games
- private
- market
- coffee
- cookie
- forever
- freedom
- student
- account
- academia
- files
- windows
- monitor
- unknown
- anything
- letitbe
- letmein
- domain
- access
- money
- campus
- explorer
- exchange
- customer
- cluster
- nobody
- codeword
- codename
- changeme
- desktop
- security
- secure
- public
- system
- shadow
- office
- supervisor
- superuser
- share
- super
- secret
- server
- computer
- owner
- backup
- database
- lotus
- oracle
- business
- manager
- temporary
- ihavenopass
- nothing
- nopassword
- nopass
- Internet
- internet
- example
- sample
- love123
- boss123
- work123
- home123
- mypc123
- temp123
- test123
- qwe123
- abc123
- pw123
- root123
- pass123
- pass12
- pass1
- admin123
- admin12
- admin1
- password123
- password12
- password1
- default
- foobar
- foofoo
- temptemp
- temp
- testtest
- test
- rootroot
- root
- adminadmin
- mypassword
- mypass
- pass
- Login
- login
- Password
- password
- passwd
- zxcvbn
- zxcvb
- zxccxz
- zxcxz
- qazwsxedc
- qazwsx
- q1w2e3
- qweasdzxc
- asdfgh
- asdzxc
- asddsa
- asdsa
- qweasd
- qwerty
- qweewq
- qwewq
- nimda
- administrator
- Admin
- admin
- a1b2c3
- 1q2w3e
- 1234qwer
- 1234abcd
- 123asd
- 123qwe
- 123abc
- 123321
- 12321
- 123123
- 1234567890
- 123456789
- 12345678
- 1234567
- 123456
- 12345
- 1234
- 123
SOLUTION
9.800
16.964.02
13 Sep 2021
16.965.00
14 Sep 2021
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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
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\CurrentControlSet\Services\Tcpip\Parameters
- TcpNumConnections=0x00fffffe
- TcpNumConnections=0x00fffffe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Applets
- dl=0
- ds=0
- dl=0
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets
- dl=0
- ds=0
- dl=0
- In HKEY_CURRENT_USERSoftware\Microsoft\Windows\CurrentVersion\Run
- {Random characters}=rundll32.exe {Malware file name and path}, {Parameter}
- {Random characters}=rundll32.exe {Malware file name and path}, {Parameter}
Step 5
Delete this registry key
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\services
- {Random characters}
- {Random characters}
Step 6
Restore this modified 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\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- CheckedValue=0 (Change to 1)
- CheckedValue=0 (Change to 1)
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Svchost
- netsvcs={Old data}, {Appended created malicious service registry entry} (Change to {Old data})
- netsvcs={Old data}, {Appended created malicious service registry entry} (Change to {Old data})
Step 7
Search and delete these files
- {Drive}\autorun.inf
- {Drive}\RECYCLER\{Generated string}\{Random characters}.{Random extension}
- \\{Server host name}\ADMIN$\System32\{Random characters}.{Random extension}
- %Application Data%\{Random characters}.dll
- %Program Files%\Internet Explorer\{Random characters}.dll
- %Program Files%\Movie Maker\{Random characters}.dll
- %System%\{Random characters}.dll
- %System%\{Random characters}.tmp
- %Temp%\{Random characters}.dll
- %Temp%\{Random characters}.tmp
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.Win32.DOWNAD.PIDB. 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.
Step 9
Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.
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