Ransom.MSIL.LEGIONLOCKER.A

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 encrypts files with specific file extensions. It drops files as ransom note.

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%\WTHBNZD.bat
• %Desktop%\ID.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).)

It adds the following processes:

• cmd /c ""%User Temp%\WTHBNZD.bat""
• vssadmin Delete Shadows /all /quiet
• vssadmin resize shadowstorage /for=c: /on=c: /maxsize=401MB
• vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded
• vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB
• vssadmin resize shadowstorage /for=d: /on=d: /maxsize=unbounded
• vssadmin resize shadowstorage /for=e: /on=e: /maxsize=401MB
• vssadmin resize shadowstorage /for=e: /on=e: /maxsize=unbounded
• vssadmin resize shadowstorage /for=f: /on=f: /maxsize=401MB
• vssadmin resize shadowstorage /for=f: /on=f: /maxsize=unbounded
• vssadmin resize shadowstorage /for=g: /on=g: /maxsize=401MB
• vssadmin resize shadowstorage /for=g: /on=g: /maxsize=unbounded
• vssadmin resize shadowstorage /for=h: /on=h: /maxsize=401MB
• vssadmin resize shadowstorage /for=h: /on=h: /maxsize=unbounded
• vssadmin Delete Shadows /all /quiet

(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).)

Process Termination

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

• photorec_win.exe
• recuva.exe
• qphotorec_win.exe
• rannohdecryptor.exe
• sdclt.exe

Other Details

This Ransomware does the following:

• Deletes files that contains the following strings:
  
  • backup
  • .vhd
  • .bac
  • .bak
  • .wbcat
  • .bkf
  • .set
  • .win
  • .dsk
• Hides the window of the following running processes:
  
  • LegionLocker3.0
  • opera
  • firefox
  • taskmgr
  • cmd
  • regedit
  • ProcessHacker
  • ProcessHacker2
  • mmc
  • chrome
  • iexplore

Ransomware Routine

This Ransomware encrypts files with the following extensions:

• .txt
• .doc
• .docx
• .xls
• .xlsx
• .ppt
• .pptx
• .wav
• .odt
• .jpeg
• .png
• .jpg
• .csv
• .sql
• .mdb
• .sln
• .php
• .asp
• .aspx
• .html
• .sql
• .mp4
• .7z
• .rar
• .m4a
• .wma
• .avi
• .wmv
• .csv
• .d3dbsp
• .zip
• .sie
• .sum
• .ibank
• .t13
• .t12
• .qdf
• .gdb
• .tax
• .pkpass
• .bc6
• .bc7
• .bkp
• .qic
• .bkf
• .sidn
• .sidd
• .mddata
• .itl
• .itdb
• .icxs
• .hvpl
• .hplg
• .hkdb
• .mdbackup
• .syncdb
• .gho
• .cas
• .svg
• .map
• .wmo
• .itm
• .sb
• .fos
• .mov
• .vdf
• .ztmp
• .sis
• .sid
• .ncf
• .menu
• .layout
• .dmp
• .blob
• .esm
• .vcf
• .vtf
• .dazip
• .fpk
• .mlx
• .kf
• .iwd
• .vpk
• .tor
• .psk
• .rim
• .w3x
• .fsh
• .ntl
• .arch00
• .lvl
• .snx
• .cfr
• .ff
• .vpp_pc
• .lrf
• .m2
• .mcmeta
• .vfs0
• .mpqge
• .kdb
• .db0
• .dba
• .rofl
• .hkx
• .bar
• .upk
• .das
• .iwi
• .litemod
• .asset
• .forge
• .ltx
• .bsa
• .apk
• .re4
• .sav
• .lbf
• .slm
• .bik
• .epk
• .rgss3a
• .pak
• .big
• "wallet
• .wotreplay
• .xxx
• .desc
• .py
• .m3u
• .flv
• .js
• .css
• .rb
• .p7c
• .pk7
• .p7b
• .p12
• .pfx
• .pem
• .crt
• .cer
• .der
• .x3f
• .srw
• .pef
• .ptx
• .r3d
• .rw2
• .rwl
• .raw
• .raf
• .orf
• .nrw
• .mrwref
• .mef
• .erf
• .kdc
• .dcr
• .cr2
• .crw
• .bay
• .sr2
• .srf
• .arw
• .3fr
• .dng
• .jpe
• .jpg
• .cdr
• .indd
• .ai
• .eps
• .pdf
• .pdd
• .dbf
• .mdf
• .wb2
• .rtf
• .wpd
• .dxg
• .xf
• .dwg
• .pst
• .accdb
• .mdb
• .pptm
• .pptx
• .ppt
• .xlk
• .xlsb
• .xlsm
• .xlsx
• .xls
• .wps
• .docm
• .docx
• .doc
• .odb
• .odc
• .odm
• .odp
• .ods
• .odt
• .bat
• .ico
• .cs
• .pdb
• .md
• .php
• .css
• .fingerprint
• .json
• .sys
• .suo
• .ide
• .con
• .VHD
• .bac
• .bak
• .wbcat
• .set
• .psd
• .win
• .dsk
• .cpp
• .csproj
• .user
• .filters
• .vcxproj
• .xaml
• .manifest
• .config
• .resx
• .lerf
• .cache
• .htm
• .xml
• .psd
• .gif
• .h
• .vb
• .asm
• .inc
• .pas
• .go
• .pb
• .pbi
• .Ico
• .vbproj
• .dat
• .il
• .myapp
• .bmp
• .lib
• .dll
• .one
• .mp3
• .mp4
• .log
• .vmdk
• .vmx
• .vmsd
• .vmsn
• .vbs
• .wpl
• .xml
• .xaml
• .html

It avoids encrypting files found in the following folders:

• AppData
• Windows
• Program Files (x86)
• Program Files

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

• {Infected Directory}\LegionReadMe.txt