RANSOM_WALTRIX.RT

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.

This is the Trend Micro detection for files that exhibit certain behaviors.

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.

This malware arrives via the following means:

• delivered by exploit kits

Installation

This Trojan drops the following component file(s):

• For Windows XP and below:
  • %User Startup%\!{unique ID}{random character 1}.lnk - component that automatically opens the image ransom note upon system startup
  • %User Startup%\!{unique ID}{random character 2}.lnk - component that automatically opens the HTML ransom note upon system startup
  • %All Users Profile%\Z - deleted afterwards. This contains the installation date of the malware
  • %All Users Profile%\!{unique ID}.cfg - deleted afterwards
  • %All Users Profile%\!{unique ID}.bmp - lockscreen image
  • %All Users Profile%\!{unique ID}.html - ransom note
  • %Desktop%\!{unique ID}.bmp - ransom image
  • %Desktop%\!{unique ID}.html - ransom note
  • %Desktop%\!{unique ID}.txt - ransom note
  • {folders containing encrypted files}\!{unique ID}.html - ransom note
  • {folders containing encrypted files}\!{unique ID}.txt - ransom note

    where {unique ID} contains 12 hexadecimal characters

• For Windows 7 and above:
  • %Start Menu%\Programs\Startup\!{unique ID}{random character 1}.lnk - component that automatically opens the image ransom note upon system startup
  • %Start Menu%\Programs\Startup\!{unique ID}{random character 2}.lnk - component that automatically opens the HTML ransom note upon system startup
  • %ProgramData%\Z - deleted afterwards. This contains the installation date of the malware
  • %ProgramData%\!{unique ID}.cfg - deleted afterwards
  • %ProgramData%\!{unique ID}.bmp - lockscreen image
  • %ProgramData%\!{unique ID}.html - ransom note
  • %Desktop%\!{unique ID}.bmp - ransom image
  • %Desktop%\!{unique ID}.html - ransom note
  • %Desktop%\!{unique ID}.txt - ransom note
  • {folders containing encrypted files}\!{unique ID}.html - ransom note
  • {folders containing encrypted files}\!{unique ID}.txt - ransom note

    where {unique ID} contains 12 hexadecimal characters

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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:

• {malware path}\explorer.exe {malware path and filename}.dll,XXS{number}S

  It copies the legitimate rundll32.exe as explorer.exe to the same directory of the ransomware.

Autostart Technique

This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

• %User Startup%\!{unique ID}.lnk
  where {unique ID} contains 12 hexadecimal characters

(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 file(s):

• It encrypts files and appends the extension .crypz

Process Termination

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

• cmd.exe
• taskmgr.exe
• msconfig.exe
• WerFault.exe

Other Details

This Trojan encrypts files with the following extensions:

• .3DM
• .3DS
• .3G2
• .3GP
• .4DB
• .4DL
• .4MP
• .7Z
• .A3D
• .ABM
• .ABS
• .ABW
• .ACCDB
• .ACT
• .ADN
• .ADP
• .AES
• .AF2
• .AF3
• .AFT
• .AFX
• .AGIF
• .AGP
• .AHD
• .AI
• .AIC
• .AIF
• .AIM
• .ALBM
• .ALF
• .ANI
• .ANS
• .APD
• .APK
• .APM
• .APNG
• .APP
• .APS
• .APT
• .APX
• .ARC
• .ART
• .ARW
• .ASC
• .ASE
• .ASF
• .ASK
• .ASM
• .ASP
• .ASPX
• .ASW
• .ASX
• .ASY
• .ATY
• .AVI
• .AWDB
• .AWP
• .AWT
• .AWW
• .AZZ
• .BAD
• .BAY
• .BBS
• .BDB
• .BDP
• .BDR
• .BEAN
• .BIB
• .BM2
• .BMP
• .BMX
• .BNA
• .BND
• .BOC
• .BOK
• .BRD
• .BRK
• .BRN
• .BRT
• .BSS
• .BTD
• .BTI
• .BTR
• .BZ2
• .C
• .C2
• .C4
• .C4D
• .CAL
• .CALS
• .CAN
• .CD5
• .CDB
• .CDC
• .CDG
• .CDMM
• .CDMT
• .CDR
• .CDR3
• .CDR4
• .CDR6
• .CDT
• .CER
• .CF
• .CFG
• .CFM
• .CFU
• .CGI
• .CGM
• .CIMG
• .CIN
• .CIT
• .CKP
• .CLASS
• .CLKW
• .CMA
• .CMD
• .CMX
• .CNM
• .CNV
• .COLZ
• .CPC
• .CPD
• .CPG
• .CPP
• .CPS
• .CPT
• .CPX
• .CRD
• .CRT
• .CRWL
• .CRYPT
• .CS
• .CSR
• .CSS
• .CSV
• .CSY
• .CUE
• .CV5
• .CVG
• .CVI
• .CVS
• .CVX
• .CWT
• .CXF
• .CYI
• .DAD
• .DAF
• .DB
• .DB3
• .DBF
• .DBK
• .DBT
• .DBV
• .DBX
• .DCA
• .DCB
• .DCH
• .DCS
• .DCT
• .DCU
• .DCX
• .DDL
• .DDOC
• .DDS
• .DED
• .DF1
• .DG
• .DGN
• .DGS
• .DHS
• .DIB
• .DIF
• .DIP
• .DIZ
• .DJV
• .DJVU
• .DM3
• .DMI
• .DMO
• .DNC
• .DNE
• .DOC
• .DOCB
• .DOCM
• .DOCX
• .DOCZ
• .DOT
• .DOTM
• .DOTX
• .DP1
• .DPP
• .DPX
• .DQY
• .DRW
• .DRZ
• .DSK
• .DSN
• .DSV
• .DT
• .DT2
• .DTA
• .DTD
• .DTSX
• .DTW
• .DVI
• .DVL
• .DWG
• .DX
• .DXB
• .DXF
• .DXL
• .ECO
• .ECW
• .ECX
• .EDB
• .EFD
• .EGC
• .EIO
• .EIP
• .EIT
• .EMD
• .EMF
• .EML
• .EMLX
• .EP
• .EPF
• .EPP
• .EPS
• .EPSF
• .EQL
• .ERF
• .ERR
• .ETF
• .ETX
• .EUC
• .EXR
• .FAL
• .FAQ
• .FAX
• .FB2
• .FB3
• .FBL
• .FBX
• .FCD
• .FCF
• .FDB
• .FDF
• .FDR
• .FDS
• .FDT
• .FDX
• .FDXT
• .FES
• .FFT
• .FH10
• .FH11
• .FH3
• .FH4
• .FH5
• .FH6
• .FH7
• .FH8
• .FIC
• .FID
• .FIF
• .FIG
• .FIL
• .FL
• .FLA
• .FLI
• .FLR
• .FLV
• .FM5
• .FMV
• .FODT
• .FOL
• .FP3
• .FP4
• .FP5
• .FP7
• .FPOS
• .FPT
• .FPX
• .FRM
• .FRT
• .FT10
• .FT11
• .FT7
• .FT8
• .FT9
• .FTN
• .FWDN
• .FXC
• .FXG
• .FZB
• .FZV
• .GADGET
• .GBK
• .GBR
• .GCDP
• .GDB
• .GDOC
• .GED
• .GEM
• .GEO
• .GFB
• .GGR
• .GIF
• .GIH
• .GIM
• .GIO
• .GLOX
• .GPD
• .GPG
• .GPN
• .GPX
• .GRO
• .GROB
• .GRS
• .GSD
• .GTHR
• .GTP
• .GV
• .GWI
• .GZ
• .H
• .HBK
• .HDB
• .HDP
• .HDR
• .HHT
• .HIS
• .HPG
• .HPGL
• .HPI
• .HPL
• .HS
• .HTC
• .HTM
• .HTML
• .HWP
• .HZ
• .I3D
• .IB
• .IBD
• .IBOOKS
• .ICN
• .ICON
• .IDC
• .IDEA
• .IDX
• .IFF
• .IGT
• .IGX
• .IHX
• .IIL
• .IIQ
• .IMD
• .INDD
• .INFO
• .INK
• .IPF
• .IPX
• .ITDB
• .ITW
• .IWI
• .J2C
• .J2K
• .JAR
• .JAS
• .JAVA
• .JB2
• .JBMP
• .JBR
• .JFIF
• .JIA
• .JIS
• .JKS
• .JNG
• .JOE
• .JP1
• .JP2
• .JPE
• .JPEG
• .JPG
• .JPG2
• .JPS
• .JPX
• .JRTF
• .JS
• .JSP
• .JTX
• .JWL
• .JXR
• .KDB
• .KDBX
• .KDC
• .KDI
• .KDK
• .KES
• .KEY
• .KIC
• .KLG
• .KML
• .KMZ
• .KNT
• .KON
• .KPG
• .KWD
• .LAY
• .LAY6
• .LBM
• .LBT
• .LDF
• .LGC
• .LIS
• .LIT
• .LJP
• .LMK
• .LNT
• .LP2
• .LRC
• .LST
• .LTR
• .LTX
• .LUA
• .LUE
• .LUF
• .LWO
• .LWP
• .LWS
• .LYT
• .LYX
• .M
• .M3D
• .M3U
• .M4A
• .M4V
• .MA
• .MAC
• .MAN
• .MAP
• .MAQ
• .MAT
• .MAX
• .MB
• .MBM
• .MBOX
• .MDB
• .MDF
• .MDN
• .MDT
• .ME
• .MEF
• .MELL
• .MFD
• .MFT
• .MGCB
• .MGMT
• .MGMX
• .MID
• .MIN
• .MKV
• .MMAT
• .MML
• .MNG
• .MNR
• .MNT
• .MOBI
• .MOS
• .MOV
• .MP3
• .MP4
• .MPA
• .MPF
• .MPG
• .MPO
• .MRG
• .MRXS
• .MS11
• .MSG
• .MSI
• .MT9
• .MUD
• .MWB
• .MWP
• .MXL
• .MYD
• .MYI
• .MYL
• .NCR
• .NCT
• .NDF
• .NEF
• .NFO
• .NJX
• .NLM
• .NOTE
• .NOW
• .NRW
• .NS2
• .NS3
• .NS4
• .NSF
• .NV2
• .NYF
• .NZB
• .OBJ
• .OC3
• .OC4
• .OC5
• .OCE
• .OCI
• .OCR
• .ODB
• .ODG
• .ODM
• .ODO
• .ODP
• .ODS
• .ODT
• .OFL
• .OFT
• .OMF
• .OPLC
• .OQY
• .ORA
• .ORF
• .ORT
• .ORX
• .OTA
• .OTG
• .OTI
• .OTP
• .OTS
• .OTT
• .OVP
• .OVR
• .OWC
• .OWG
• .OYX
• .OZB
• .OZJ
• .OZT
• .P12
• .P7S
• .P96
• .P97
• .PAGES
• .PAL
• .PAN
• .PANO
• .PAP
• .PAQ
• .PAS
• .PB
• .PBM
• .PC1
• .PC2
• .PC3
• .PCD
• .PCS
• .PCT
• .PCX
• .PDB
• .PDD
• .PDF
• .PDM
• .PDN
• .PDS
• .PDT
• .PE4
• .RT
• .RTD
• .RTF
• .RTX
• .RUN
• .RW2
• .RWL
• .RZK
• .RZN
• .S2MV
• .S3M
• .SAF
• .SAI
• .SAM
• .SAVE
• .SBF
• .SCAD
• .SCC
• .SCH
• .SCI
• .SCM
• .SCT
• .SCV
• .SCW
• .SDB
• .SDF
• .SDM
• .SDOC
• .SDW
• .SEP
• .SFC
• .SFW
• .SGM
• .SH
• .SIG
• .SITX
• .SK1
• .SK2
• .SKM
• .SLA
• .SLD
• .SLDX
• .SLK
• .SLN
• .SLS
• .SMF
• .SMIL
• .SMS
• .SOB
• .SPA
• .SPE
• .SPH
• .SPJ
• .SPP
• .SPQ
• .SPR
• .SQB
• .SQL
• .SQLITE3
• .SQLITEDB
• .SR2
• .SRT
• .SRW
• .SSA
• .SSK
• .ST
• .STC
• .STD
• .STE
• .STI
• .STM
• .STN
• .STP
• .STR
• .STW
• .STY
• .SUB
• .SUMO
• .SVA
• .SVF
• .SVG
• .SVGZ
• .SWF
• .SXC
• .SXD
• .SXG
• .SXI
• .SXM
• .SXW
• .T2B
• .TAB
• .TAR
• .TB0
• .TBK
• .TBN
• .TCX
• .TDF
• .TDT
• .TE
• .TEX
• .TEXT
• .TF
• .TFC
• .TG4
• .TGA
• .TGZ
• .THM
• .THP
• .TIF
• .TIFF
• .TJP
• .TLB
• .TLC
• .TM
• .TM2
• .TMD
• .TMP
• .TMV
• .TMX
• .TN
• .TNE
• .TPC
• .TPI
• .TRM
• .TVJ
• .TXT
• .U3D
• .U3I
• .UDB
• .UFO
• .UFR
• .UGA
• .UNX
• .UOF
• .UOP
• .UOT
• .UPD
• .USR
• .UTF8
• .UTXT
• .V12
• .VB
• .VBR
• .VBS
• .VCF
• .VCT
• .VCXPROJ
• .VDA
• .VDB
• .VDI
• .VEC
• .VFF
• .VMDK
• .VML
• .VMX
• .VNT
• .VOB
• .VPD
• .VPE
• .VRML
• .VRP
• .VSD
• .VSDM
• .VSDX
• .VSM
• .VST
• .VSTX
• .VUE
• .VW
• .WAV
• .WB1
• .WBC
• .WBD
• .WBK
• .WBM
• .WBMP
• .WBZ
• .WCF
• .WDB
• .WDP
• .WEBP
• .WGZ
• .WIRE
• .WKS
• .WMA
• .WMDB
• .WMF
• .WMV
• .WN
• .WP
• .WP4
• .WP5
• .WP6
• .WP7
• .WPA
• .WPD
• .WPE
• .WPG
• .WPL
• .WPS
• .WPT
• .WPW
• .WRI
• .WSC
• .WSD
• .WSF
• .WSH
• .WTX
• .WVL
• .X3D
• .X3F
• .XAR
• .XCODEPROJ
• .XDB
• .XDL
• .XHTM
• .XHTML
• .XLC
• .XLD
• .XLF
• .XLGC
• .XLM
• .XLR
• .XLS
• .XLSB
• .XLSM
• .XLSX
• .XLT
• .XLTM
• .XLTX
• .XLW
• .XML
• .XPM
• .XPS
• .XWP
• .XY3
• .XYP
• .XYW
• .YAL
• .YBK
• .YML
• .YSP
• .YUV
• .Z3D
• .ZABW
• .ZDB
• .ZDC
• .ZIF
• .ZIP
• .ZIPX
• .ZW

This is the Trend Micro detection for:

• CryptXXX version 3.2

It does the following:

• It locks the screen after file encryption routine
• It avoids to encrypt the following files/folders:
  • \WINNT
  • \RECYCLER\
  • \SYSTEM~1\
  • \BOOT\
  • \RECOVERY\
  • \$RECYCLE.BIN\
  • \PERFLOGS\
  • \EFI\
  • \CONFIG.MSI\
  • \PROGRA~1\
  • \PROGRA~2\
  • \GOOGLE\
  • \TEMP\
  • \F4BC~1\
  • \ALLUSE~1\
  • \PROGRA~1\
  • \PROGRA~2\
  • \APPDATA\
  • \PROGRA~3\
  • \PUBLIC\
  • AUTOEXEC.BAT
  • THUMBS.DB
  • \APPLIC~1\
  • \COOKIES\
  • \LOCALS~1\
  • \TEMPLA~1\
• It deletes shadow copies using vssadmin.exe
• It deletes itself as well as its LNK startup after the user chooses to reboot the system
• It reports infection status and unique ID to {BLOCKED}.{BLOCKED}.194.116

NOTES:

This ransomware locks the screen and displays the following image:

The ransom note !{unique ID}.html contains the following: