WORM_WCRY.H
Trojan-Ransom.Win32.Wanna.y (Kaspersky)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
Arrival Details
This Worm may arrive via network shares.
It 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 and executes the following files:
- %Windows%\lsasvs.exe <- detected as TROJ_WCRY.H, installs and executes the Tor client (lsass.bin) and encryptor module (taskhcst.exe)
Autostart Technique
This Worm adds and runs the following services:
- ServiceName: shcservice
DisplayName: Windows SHC Service.
ImagePath: cmd.exe /c “net share C$=C:\”. <- This makes the C drive of the remote machine shared - ServiceName: WUpdator
DisplayName: Windows Updator
ImagePath: C:\Windows\svchost.exe -> This will execute its copy in the remote machine
Propagation
This Worm uses the following file names for the copies it drops into shared networks:
- %Windows%\svchost.exe
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It uses the following user name and password to gain access to password-protected shares:
- administrador
- admin
- Administrator
- abcd
- cowboy
- sparky
- asdfgh
- secret
- bigdog
- yellow
- diamond
- richard
- patrick
- chelsea
- martin
- cheese
- golfer
- matthew
- merlin
- austin
- fucker
- taylor
- corvette
- summer
- hammer
- heather
- ginger
- nicole
- thunder
- sexy
- computer
- freedom
- biteme
- orange
- amanda
- hello
- ashley
- yankees
- dallas
- william
- silver
- maggie
- joshua
- access
- daniel
- pepper
- asshole
- jessica
- sunshine
- love
- michelle
- andrew
- charlie
- george
- hockey
- killer
- batman
- fuck
- soccer
- robert
- tigger
- thomas
- buster
- ranger
- trustno1
- fuckyou
- hunter
- fuckme
- harley
- jordan
- jennifer
- shadow
- michael
- mustang
- welkome
- bumble
- pussy
- monkey
- root
- angel
- solo
- asdfg
- asdf
- qwer
- starwars
- qwertyuiop
- princess
- baseball
- football
- letmein
- superman
- login
- test
- pass
- passwd
- master
- dragon
- abc123
- server
- 1qaz2wsx
- welcome
- qwerty
- passw0rd
- password
- p@ssw0rd
- !@#$%^&*()
- !@#$%^&*(
- !@#$%^&*
- !@#$%^&
- !@#$%^
- !@#$%
- !@#$
- abcd1234
- 123456!
- 12345!
- 1234!@#$
- 1q2w3e4r!
- 1q2w3e4!
- 1q2w3e!
- 1q2w3e4r
- 1q2w3e4
- 1q2w3e
- 121212
- 666666
- 6969
- 696969
- 123123
- 654321
- 4321
- 54321
- 1111
- 111111
- 1234567890
- 1234567
- 1234
- 123456789
- 12345
- 12345678
- 123456
Dropping Routine
This Worm drops the following files:
- %Windows%\lsass.bin <- contains the Tor Client and its components
- %Windows%\fff <- dropped as system file with 0 bytes
- %Windows%\taskhcst.exe <- main encryptor module, detected as Ransom_WCRY.H
Other Details
This Worm does the following:
- It scans the following to check for open port 445:
- Hosts on the Local Area Network
- Randomly-generated IP address over the Internet
- If it finds a host either on the LAN/Internet with open port 445, it attempts to remotely create a service (via IPC$ share) and drop its copy in the remote machine by brute-forcing access in the file sharing
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
Disable this malware service
- shcserviceWUpdator
Step 4
Restart in Safe Mode
Step 5
Remove the malware/grayware file dropped/downloaded by WORM_WCRY.H. (Note: Please skip this step if the threat(s) listed below have already been removed.)
- TROJ_WCRY.H
Step 6
Search and delete this file
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_WCRY.H. 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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