RANSOM_WALTRIX.YUYALG
Ransom:Win32/Exxroute (Microsoft), Trojan-Ransom.Win32.CryptXXX.ask (Kaspersky)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
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.
TECHNICAL DETAILS
346,624 bytes
DLL
Yes
11 Jul 2016
Connects to URLs/IPs, Encrypts files, Displays message/message boxes
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 files:
- %User Startup%\{random character}.lnk - component that automatically opens the image ransom note upon system startup
- %Application Data%\Microsoft\Windows\Network Shortcuts\!README.bmp - ransom image
- %Application Data%\Microsoft\Windows\Network Shortcuts\!README.html - ransom note
- {folders containing encrypted files}\!README.html - ransom note
- %Desktop%\!README.html - ransom note
- %Desktop%\!README.bmp - ransom image
(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.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.. %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.)
It adds the following processes:
- %Sytem%\rundll32.exe {malware path and filename}.dll,XMS{number}
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 replaces original file name the extension {32 hexadecimal characters}.{5 hexadecimal characters}
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:
- .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
- .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
- .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
- .Z3D
- .ZABW
- .ZDB
- .ZDC
- .ZIF
- .ZIP
- .ZIPX
- .ZW
It does the following:
- It deletes shadow copies using vssadmin.exe
- 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\
NOTES:
This ransomware locks the screen and displays the following image:
![](http://documents.trendmicro.com/images/RANSOM_WALTRIX_YUYALG1.jpg)
The ransom note !{unique ID}.html contains the following:
![](http://documents.trendmicro.com/images/RANSOM_WALTRIX_YUYALG2.jpg)
SOLUTION
9.800
12.646.03
12 Jul 2016
12.647.00
12 Jul 2016
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
Restart in Safe Mode
Step 4
Search and delete this file
- %User Startup%\{random characters}.lnk
- !README.html
- !README.bmp
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_WALTRIX.YUYALG. 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 6
Scan your computer with your Trend Micro product to delete files detected as RANSOM_WALTRIX.YUYALG. 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 7
Restore encrypted files from backup.
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