RANSOM_LOCKY.DLDSAPH
Trojan-Ransom.Win32.Locky.cfc (Kaspersky), Trojan.Ransom.Zepto.O (F-Secure)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware, 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.
It connects to certain websites to send and receive information.
TECHNICAL DETAILS
163,328 bytes
DLL
No
28 Sep 2016
Encrypts files
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 of encrypted files}\_{number of folders encrypted}_HOWDO_text.html - ransom note
It drops and executes the following files:
- %desktop%\_HOWDO_text.html - Ransom note
- %desktop%\_HOWDO_text.bmp - image used as wallpaper
Other System Modifications
This Trojan modifies the following file(s):
- It encrypts files in fixed, removable, RAM disk drives, and network shares.
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = "0"
(Note: The default value data of the said registry entry is {user preference}.)
HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"
(Note: The default value data of the said registry entry is {user preference}.)
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%Desktop%\_HOWDO_text.bmp"
(Note: The default value data of the said registry entry is {user preference}.)
Other Details
This Trojan connects to the following website to send and receive information:
- http://{BLOCKED}.{BLOCKED}.200.247/apache_handler.php
- http://{BLOCKED}.{BLOCKED}.55.225/apache_handler.php
- http://{Domain Generated Algorithm}.{org, pw, work, biz, xyz, info}/apache_handler.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
- .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
- .wav
- .wb2
- .wk1
- .wks
- .wma
- .wmv
- .xlc
- .xlm
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .xml
- .zip
- .wallet
- .wallet.dat
It renames encrypted files using the following names:
- {unique ID per victim}-{identifier}.odin
It does the following:
- It prevents encrypting files containing any of the strings in its full path name:
- winnt
- Application Data
- AppData
- Program Files (x86)
- Program Files
- thumbs.db
- $Recycle.Bin
- System Volume Information
- Windows
- It deletes shadow copies by executing the following command:
- vssadmin.exe Delete Shadows /Quiet /All
NOTES:
It changes the wallpaper with the following image:
It drops the following ransom note:
SOLUTION
9.800
12.804.06
28 Sep 2016
12.805.00
29 Sep 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 these files
Step 5
Reset your Desktop properties
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_LOCKY.DLDSAPH. 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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