TROJ_CRYPTESLA.PE

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 modifies the Internet Explorer Zone Settings.

It connects to certain websites to send and receive information. It deletes the initially executed copy of itself.

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:

• %Application Data%\{Random 7 characters}.exe

(Note: %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.)

It drops the following files:

• %Application Data%\log.html - Contains the list of encrypted files.
• %Desktop%\CryptoLocker.lnk - Shortcut file pointing to the dropped copy
• %Application Data%\key.dat
• %Desktop%\HELP_TO_SAVE_YOUR_FILES.bmp
• %Desktop%\HELP_TO_SAVE_YOUR_FILES.txt

(Note: %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 mutexes to ensure that only one of its copies runs at any one time:

• System1230123

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
svv_e = "%Application Data%\{Random 7 characters}.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
*svv_e = "%Application Data%\{Random 7 characters}.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKLM\SOFTWARE\Microsoft\
Tracing\{Random 7characters}_RASAPI32

HKLM\SOFTWARE\Microsoft\
Tracing\{Random 7characters}_RASMANCS

It modifies the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = "0"

(Note: The default value data of the said registry entry is {User Preferences}.)

HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"

(Note: The default value data of the said registry entry is {User Preferences}.)

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%Desktop%\HELP_TO_SAVE_YOUR_FILES.bmp"

(Note: The default value data of the said registry entry is {User Preferences}.)

Process Termination

This Trojan terminates processes or services that contain any of the following strings if found running in the affected system's memory:

• taskmgr
• procexp
• regedit
• msconfig
• cmd.exe

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

• http://ipinfo.io/ip

It connects to the following website to send and receive information:

• http://{BLOCKED}q26q2h4jkzj.2kjb10.net
• http://{BLOCKED}4hib47vlep5o.42kjb11.net
• http://{BLOCKED}47vlep5o.tor2web.blutmagie.de:443
• http://{BLOCKED}4hib47vlep5o.tor2web.fi:443

It deletes the initially executed copy of itself

NOTES:

It encrypt files with the following extensions in all folders found in the physical drives and appends .ecc as the new file extension of the encrypted files:

• 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
• mdd
• ata
• itl
• itdb
• icxs
• hvpl
• hplg
• hkdbmdbackup
• 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
• db
• rofl
• hkx
• bar
• upk
• das
• iwi
• litemod
• asset
• forge
• ltx
• bsa
• apk
• re4
• sav
• lbf
• slm
• bik
• epk
• rgss3a
• pak
• big
• unity3d
• wotreplay
• xxx
• desc
• py
• m3u
• flv
• js
• css
• rb
• png
• jpeg
• txt
• p7c
• 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
• psd
• 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

It deletes shadow copies by executing the following command:

• vssadmin delete shadows /all

It sets the system's desktop wallpaper to the following image:

It demands payment for using decryption service: