RANSOM_LOCKY.DTT

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 connects to certain websites to send and receive information. 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 files:

• {folder containing encrypted files}\_{count of dropped note per folder}_HELP_instructions.html - ransom note
• {malware path and filename}.dll.txt

It drops and executes the following files:

• %Desktop%\_HELP_instructions.html - ransom note
• %Desktop%\_HELP_instructions.bmp - image used as wallpaper

(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.)

Other System Modifications

This Trojan modifies the following file(s):

• It encrypts files in fixed, removable, RAM disk drives, and network shares.
• It renames the encrypted files to {unique ID per victim}-{identifier}.zepto

It adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %Desktop%\_HELP_instructions.bmp

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Other Details

This Trojan connects to the following website to send and receive information:

• http://{BLOCKED}.{BLOCKED}.148.19/data/info.php
• http://{BLOCKED}.{BLOCKED}.210.183/data/info.php
• http://{BLOCKED}.{BLOCKED}.247.211/data/info.php
• http://{BLOCKED}.{BLOCKED}.55.171/data/info.php
• http://{Domain Generated Algorithm}.{ru, info, biz, click, su, work, pl, org, pw, xyz}/data/info.php

It encrypts files with the following extensions:

• .001
• .002
• .003
• .004
• .005
• .006
• .007
• .008
• .009
• .010
• .011
• .123
• .3dm
• .3ds
• .3g2
• .3gp
• .602
• .7z
• .ARC
• .CSV
• .DOC
• .DOT
• .MYD
• .MYI
• .NEF
• .PAQ
• .PPT
• .RTF
• .SQLITE3
• .SQLITEDB
• .XLS
• .aes
• .apk
• .asc
• .asf
• .asm
• .asp
• .asset
• .avi
• .bak
• .bat
• .bik
• .bmp
• .brd
• .bsa
• .bz2
• .c
• .cgm
• .class
• .cmd
• .cpp
• .crt
• .cs
• .csr
• .d3dbsp
• .das
• .db
• .dbf
• .dch
• .dif
• .dip
• .djv
• .djvu
• .docb
• .docm
• .docx
• .dotm
• .dotx
• .fla
• .flv
• .forge
• .frm
• .gif
• .gpg
• .gz
• .h
• .hwp
• .ibd
• .iwi
• .jar
• .java
• .jpeg
• .jpg
• .js
• .key
• .lay
• .lay6
• .lbf
• .ldf
• .litemod
• .litesql
• .ltx
• .m3u
• .m4a
• .m4u
• .max
• .mdb
• .mdf
• .mid
• .mkv
• .mml
• .mov
• .mp3
• .mp4
• .mpeg
• .mpg
• .ms11
• .ms11 (Security copy)
• .n64
• .odb
• .odg
• .odp
• .ods
• .odt
• .onetoc2
• .otg
• .otp
• .ots
• .ott
• .p12
• .pas
• .pdf
• .pem
• .php
• .pl
• .png
• .pot
• .potm
• .potx
• .ppam
• .pps
• .ppsm
• .ppsx
• .pptm
• .pptx
• .psd
• .pst
• .qcow2
• .rar
• .raw
• .rb
• .re4
• .sav
• .sch
• .sh
• .sldm
• .sldx
• .slk
• .sql
• .stc
• .std
• .sti
• .stw
• .svg
• .swf
• .sxc
• .sxd
• .sxi
• .sxm
• .sxw
• .tar
• .tbk
• .tgz
• .tif
• .tiff
• .txt
• .uop
• .uot
• .upk
• .vb
• .vbs
• .vdi
• .vmdk
• .vmx
• .vob
• .wallet
• .wallet.dat
• .wav
• .wb2
• .wk1
• .wks
• .wma
• .wmv
• .xlc
• .xlm
• .xlsb
• .xlsm
• .xlsx
• .xlt
• .xltm
• .xltx
• .xlw
• .xml
• .zip

It does the following:

• It deletes shadow copies by executing the following command:
  • vssadmin.exe Delete Shadows /Quiet /All
• It prevents encrypting files containing any of the strings in its full path name:
  • tmp
  • winnt
  • Application Data
  • AppData
  • Program Files (x86)
  • Program Files
  • temp
  • thumbs.db
  • $Recycle.Bin
  • System Volume Information
  • Boot
  • Windows
• It requires the argument "qwerty 323" in order to perform its intended routine.

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

• Language of affected system
• number of failed encrypted files
• number of encrypted files
• OS architecture (if 64bit)
• victim ID

NOTES:
It displays the following ransom note:

Once the victim accesses the payment site specified in the ransom note, the browser displays the following Locky Decryptor site:

It does not have rootkit capabilities.

It does not exploit any vulnerability.