RANSOM_WALTRIX.PC

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.

It terminates itself if it detects it is being run in a virtual environment. It gathers information and reports it to its servers.

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 file(s)/component(s):

• %All Users Profile%\Application Data\{unique ID}.key
• %All Users Profile%\Application Data\Z - deleted afterwards; contains installation date of the malware
• {folders containing encrypted files}\!Recovery_{unique ID}.bmp - image used as wallpaper
• {folders containing encrypted files}\!Recovery_{unique ID}.html - ransom note
• {folders containing encrypted files}\!Recovery_{unique ID}.txt - ransom note

(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It adds the following processes:

• copy of the legitimate rundll32.exe named as:
  • {malware path}\svchost.exe
• executes svchost.exe {malware}.dll, MS11{number}

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• {first 5 characters from the unique ID}

Autostart Technique

This Trojan drops the following files:

• %User Startup%\{unique ID}.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "{random}\{unique ID}.bmp"

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Other Details

This Trojan encrypts files with the following extensions:

• .3DM
• .3DS
• .3G2
• .3GP
• .7Z
• .ACCDB
• .AES
• .AI
• .AIF
• .APK
• .APP
• .ARC
• .ASC
• .ASF
• .ASM
• .ASP
• .ASPX
• .ASX
• .AVI
• .BMP
• .BRD
• .BZ2
• .C
• .CER
• .CFG
• .CFM
• .CGI
• .CGM
• .CLASS
• .CMD
• .CPP
• .CRT
• .CS
• .CSR
• .CSS
• .CSV
• .CUE
• .DB
• .DBF
• .DCH
• .DCU
• .DDS
• .DIF
• .DIP
• .DJV
• .DJVU
• .DOC
• .DOCB
• .DOCM
• .DOCX
• .DOT
• .DOTM
• .DOTX
• .DTD
• .DWG
• .DXF
• .EML
• .EPS
• .FDB
• .FLA
• .FLV
• .FRM
• .GADGET
• .GBK
• .GBR
• .GED
• .GIF
• .GPG
• .GPX
• .GZ
• .H
• .H
• .HTM
• .HTML
• .HWP
• .IBD
• .IBOOKS
• .IFF
• .INDD
• .JAR
• .JAVA
• .JKS
• .JPG
• .JS
• .JSP
• .KEY
• .KML
• .KMZ
• .LAY
• .LAY6
• .LDF
• .LUA
• .M
• .M3U
• .M4A
• .M4V
• .MAX
• .MDB
• .MDF
• .MFD
• .MID
• .MKV
• .MML
• .MOV
• .MP3
• .MP4
• .MPA
• .MPG
• .MS11
• .MSI
• .MYD
• .MYI
• .NEF
• .NOTE
• .OBJ
• .ODB
• .ODG
• .ODP
• .ODS
• .ODT
• .OTG
• .OTP
• .OTS
• .OTT
• .P12
• .PAGES
• .PAQ
• .PAS
• .PCT
• .PDB
• .PDF
• .PEM
• .PHP
• .PIF
• .PL
• .PLUGIN
• .PNG
• .POT
• .POTM
• .POTX
• .PPAM
• .PPS
• .PPSM
• .PPSX
• .PPT
• .PPTM
• .PPTX
• .PRF
• .PRIV
• .PRIVAT
• .PS
• .PSD
• .PSPIMAGE
• .PY
• .QCOW2
• .RA
• .RAR
• .RAW
• .RM
• .RSS
• .RTF
• .SCH
• .SDF
• .SH
• .SITX
• .SLDX
• .SLK
• .SLN
• .SQL
• .SQLITE
• .SQLITE
• .SRT
• .STC
• .STD
• .STI
• .STW
• .SVG
• .SWF
• .SXC
• .SXD
• .SXI
• .SXM
• .SXW
• .TAR
• .TBK
• .TEX
• .TGA
• .TGZ
• .THM
• .TIF
• .TIFF
• .TLB
• .TMP
• .TXT
• .UOP
• .UOT
• .VB
• .VBS
• .VCF
• .VCXPRO
• .VDI
• .VMDK
• .VMX
• .VOB
• .WAV
• .WKS
• .WMA
• .WMV
• .WPD
• .WPS
• .WSF
• .XCODEPROJ
• .XHTML
• .XLC
• .XLM
• .XLR
• .XLS
• .XLSB
• .XLSM
• .XLSX
• .XLT
• .XLTM
• .XLTX
• .XLW
• .XML
• .YUV
• .ZIP
• .ZIPX

It renames encrypted files using the following names:

• {original file name.file extension}.crypt

It terminates itself if it detects it is being run in a virtual environment.

It does the following:

• It checks if it is being run in a virtual environment by:
  • querying the registry entry:
     HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString
  • checks mouse activity

It gathers the following information and reports it to its servers:

• It reports infection status and unique ID to {BLOCKED}.{BLOCKED}.82.19:443

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.