Ransom.PS1.NETWALKER.H

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops files as ransom note. It avoids encrypting files with the following file extensions.

Arrival Details

This Ransomware 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 Ransomware drops the following files:

• %User Temp%\{Random Characters}.tmp
• %User Temp%\{Random Characters}.0.cs
• %User Temp%\{Random Characters}.dll
• %User Temp%\{Random Characters}.cmdline
• %User Temp%\{Random Characters}.out
• %User Temp%\{Random Characters}.err
• %User Temp%\{Random Characters}.pdb

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

• "%Windows%\Microsoft.NET\Framework\v2.0.50727\csc.exe" /noconfig /fullpaths @"%User Temp%\{Random Characters}.cmdline"
• "%Windows%\Microsoft.NET\Framework\v2.0.50727\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%User Temp%\{Random String}.tmp" "%User Temp%\{Random String}.tmp"
• "%System%\notepad.exe" "%Desktop%\{6 Random Characters}-Readme.txt"

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Process Termination

This Ransomware terminates the following services if found on the affected system:

• Lotus*
• veeam*
• cbvscserv*
• hMailServer
• backup*
• *backup*
• apach*
• firebird*
• ibmiasrw
• IBM Domino*
• Simply Accounting Database Connection Manager
• IASJet
• QB*
• *sql*
• sql*
• QuickBooksDB*
• IISADMIN
• omsad
• dc*32
• server Administrator
• wbengine
• mr2kserv
• MSExchange*
• ShadowProtectSvc
• SP*4
• teamviewer
• MMS
• AcronisAgent
• ARSM
• AcrSch2Svc
• vsnapvss
• SPXService
• StorageCraft ImageManager
• wrsvc
• stc_endpt_svc
• acrsch2svc*

It terminates the following processes if found running in the affected system's memory:

• agntsvc.exe
• infopath.exe
• mydesktopqos.exe
• visio.exe
• firefoxconfig.exe
• xfssvccon.exe
• oracle.exe
• winword.exe
• thebat64.exe
• dbsnmp.exe
• ocomm.exe
• wordpad.exe
• tbirdconfig.exe
• msaccess.exe
• powerpnt.exe
• outlook.exe
• onenote.exe
• mydesktopservice.exe
• *sql*
• dbeng50.exe
• thebat.exe
• ocautoupds.exe
• mspub.exe
• synctime.exe
• excel.exe
• encsvc.exe
• ocssd.exe
• thunderbird.exe
• sqbcoreservice.exe
• sql*
• store.exe
• agent*
• team*
• wrsa.exe
• jetty.exe
• swstrtr*
• swag*
• cfdot*
• coldfus*
• msdtssr*
• report*
• msmdsrv*
• fdlaunch*
• b1*
• sap*
• sage*
• postg*
• vee*
• wbengine*
• oracle*
• QB*
• be*
• ba*
• db*
• bd2*
• apach*
• black*
• bes10*
• IBM*
• hMailServer*
• cbservi*
• ntrtscan.exe
• cbvscserv*
• nservice.exe
• pg*
• nslsvice.exe

Other Details

This Ransomware deletes the following files to remove its traces in the system:

• %User Temp%\{Random Characters}.tmp
• %User Temp%\{Random Characters}.0.cs
• %User Temp%\{Random Characters}.dll
• %User Temp%\{Random Characters}.cmdline
• %User Temp%\{Random Characters}.out
• %User Temp%\{Random Characters}.err
• %User Temp%\{Random Characters}.pdb

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file name:

• ntuser.dat*
• iconcache.db
• gdipfont*.dat
• ntuser.ini
• usrclass.dat
• usrclass.dat*
• boot.ini
• bootmgr
• bootnxt
• desktop.ini
• ntuser.dat
• autorun.inf
• ntldr
• thumbs.db
• bootsect.bak
• bootfont.bin

It avoids encrypting files with the following strings in their file path:

• *\Program File*\Cisco
• \*\users\*\appdata\*\microsoft
• *:\users\*\appdata\*\microsoft
• *media player*
• *temporary internet*s*
• *\windows\cache*ed
• *\program file*\common files\reference ass*em
• *\program file*\common files\*shareds
• *\program file*\common files\system*
• *\program file*\microsoft gamesl
• *\program file*\cuass**
• *\program file*\windowspowershell*
• *\program file*\windows side*t
• *\program file*\windows photo*
• *\program file*\windows nt*
• *windows defender*
• *\program file*\windows portable*
• *\program file*\windows media*
• *Old Firefox data
• *Mozilla*
• *Mozilla
• *Internet Explorer
• *dvd maker
• *microsoft\provisioning
• *appdata*packagese
• *appdata*microsoftws
• *\program file*\vmwarent
• \*\windowstemp
• \*\winnte
• \*\users\*\*temp
• *:\program file*\vmware
• *:\windows
• *boot
• *perflogs
• *$windows.~ws
• *:\winntmp
• *msocache
• *:\users\*\*temp
• *windows.old
• *system volume information

It renames encrypted files using the following names:

• {Original Filename}.{Original File Extension}.{6 Random Characters}

It drops the following file(s) as ransom note:

• %Desktop%\{6 Random Characters}-Readme.txt
• {Encrypted Directory}\{6 Random Characters}-Readme.txt

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It leaves text files that serve as ransom notes containing the following text:

It avoids encrypting files with the following file extensions:

• .themepack
• .bat
• .deskthemepack
• .spl
• .cmd
• .diagcab
• .key
• .ldf
• .rtp
• .prf
• .ani
• .wpx
• .386
• .lock
• .rom
• .hlp
• .com
• .386
• .adv
• .scr
• .nls
• .msi
• .msu
• .icl
• .cpl
• .mpa
• .ps1
• .idx
• .ico
• .lnk
• .ocx
• .dll
• .diagcfg
• .icns
• .drv
• .cur
• .msstyles
• .ics
• .cab
• .diagpkg
• .nomedia
• .shs
• .hta
• .theme
• .regtrans-ms
• .mui
• .clb
• .mod
• .msc
• .sys
• .exe
• .msp
• .ext