RANSOM_CRYPTESLA.LD

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 modifies the Internet Explorer Zone Settings.

It connects to certain websites to send and receive information. It deletes itself after execution. 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 copies of itself into the affected system and executes them:

• %User Profile%\Documents\{random filename}.exe (with non-Administrator Privileges)
• %Windows%\{random filename}.exe (with Administrator Privileges)

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

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

• 345432-123rvr4

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%System%\cmd.exe /c start "" "%Windows%\{random filename}.exe"" (Note: with Administrator Privileges)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%System%\cmd.exe /c start "" "%User Profile%\Documents\{random filename}.exe "" (Note: with non-Administrator Privileges)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\zzzsys

HKEY_CURRENT_USER\Software\{Installation ID}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnabledLinkConnections = "1"

HKEY_CURRENT_USER\Software\{Installation ID}
data = {encrypted information}

HKEY_CURRENT_USER\Software\zzzsys
ID = {Installation ID}

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Dropping Routine

This Trojan drops the following files:

• %User Profile%\Documents\recover_file_{random letters}.txt
• %Desktop%\_ReCoVeRy_.HTM
• %Desktop%\_ReCoVeRy_.TXT
• %Desktop%\_ReCoVeRy_.png

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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 Details

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

• http://{BLOCKED}edicalcentre.com/wp-content/uploads/wstr.php
• http://{BLOCKED}lizedaccess.co.uk/wp-content/uploads/2015/09/wstr.php
• http://{BLOCKED}nstitut.org/wp-content/themes/bstr.php
• http://www.{BLOCKED}aticauno.net/gamma/tmp/bstr.php
• http://www.{BLOCKED}aticauno.net/gamma/tmp/wstr.php
• http://{BLOCKED}our.info/users/28c4fe1/wstr.php

It encrypts files with the following extensions:

• .pif
• .com
• .bat
• .cmd
• .lnkimage
• .vfolder
• .zip
• .dvr-ms
• .wvx
• .wmx
• .wmv
• .wm
• .mpv2
• .mpg
• .mpeg
• .mpe
• .mpa
• .mp2v
• .mp2
• .m1v
• .IVF
• .asx
• .asf
• .avi
• .wax
• .snd
• .rmi
• .m3u
• .au
• .aiff
• .aifc
• .aif
• .midi
• .mid
• .wma
• .wav
• .mp3
• .wmf
• .tiff
• .tif
• .rle
• .png
• .jpeg
• .jpe
• .jpg
• .jfif
• .gif
• .emf
• .dib
• .wsh
• .wsf
• .wsc
• .ws
• .vsw
• .vst
• .vss
• .vsmacros
• .vbs
• .vbe
• .vb
• .shs
• .shb
• .sct
• .scr
• .scf
• .reg
• .pst
• .prg
• .prf
• .pl
• .pif
• .pcd
• .ops
• .mst
• .msp
• .mshxml
• .msh
• .msc
• .mdz
• .mdw
• .mdt
• .mde
• .mdb
• .mda
• .mcf
• .maw
• .mav
• .mau
• .mat
• .mas
• .mar
• .maq
• .mam
• .mag
• .maf
• .mad
• .lnk
• .ksh
• .jse
• .js
• .its
• .isp
• .ins
• .inf
• .hlp
• .grp
• .gadget
• .fxp
• .exe
• .csh
• .crt
• .cpl
• .cmd
• .chm
• .cer
• .bat
• .bas
• .app
• .adp
• .ade
• .xbap
• .xps
• .pdf
• .pot
• .hta
• .xlt
• .pps
• .xlw
• .dot
• .rtf
• .ppt
• .xls
• .doc
• .xml
• .hta
• .docx
• .mrwref
• .indd
• .rofl
• .mpqge
• .vfs0
• .mcmeta
• .vpp_pc
• .arch00
• .itdb
• .mddata
• .sidd
• .sidn
• .pkpass
• .ibank
• .dazip
• .blob
• .layout
• .menu
• .ztmp
• .syncdb
• .mdbackup
• .hkdb
• .hplg
• .hvpl
• .icxs
• .docm
• .xlsx
• .xlsm
• .xlsb
• .pptx
• .pptm
• .accdb
• .jpeg
• .desc
• .litesql
• wallet
• .rgss3a
• .forge
• .asset
• .litemod
• .d3dbsp
• .tiff
• .txt
• .bak

It opens the following files:

• %Desktop%\_ReCoVeRy_.HTM
• %Desktop%\_ReCoVeRy_.TXT
• %Desktop%\_ReCoVeRy_.png

(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.)

It renames encrypted files using the following names:

• {original file name and extenstion}.mp3

It sets the attributes of the following file(s) to Hidden and System:

• {dropped copy of itself}

It does the following:

• It deletes shadow copies by executing the following command:
  • %System%\wbem\WMIC.exe" shadowcopy delete /nointeractive
• It terminates processes containing the following strings:
  • askmg <- Task Manager
  • rocex <- Process Explorer
  • egedi <- Regedit
  • sconfi <- MS Config
  • cmd <- Command Prompt
• It avoids encrypting files with the following strings:
  • recove
• It encrypts files in all fixed, removable, and network drives and shares
• It drops _ReCoVeRy_+{random 5 letters}.png, _ReCoVeRy_+{random 5 letters}.txt, _ReCoVeRy_+{random 5 letters}.html to the folders where it tries to encrypt files
• It displays the following ransom notes after encryption is done.
  • {Insert ransomnote_html.PNG here}
  • {Insert ransomnote_txt.PNG here}
  • {Insert ransomnote_png.PNG here}
• It avoids encrypting files from the following directories:
  • Windows
  • Program Files
  • %All Users Profile%\Application Data (Windows XP and below)
  • ProgramData (Windows Vista and above)

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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 deletes itself after execution.

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

• Infection status
• Bitcoin address
• Total size of encrypted files
• Malware version
• OS information
• Installation ID