RANSOM_LOCKY.R00JC0DHQ16
Ransom:Win32/Locky (Microsoft); Trojan-Ransom.Win32.Scatter.bc (Kaspersky);
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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. It deletes the initially executed copy of itself. It is capable of encrypting files in the affected system.
TECHNICAL DETAILS
210,218 bytes
EXE
No
24 Aug 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:
- {folders containing encrypted files}\_{count of dropped note per folder}_HELP_instructions.html - ransom note
- %Application Data%\t.jat
- %Application Data%\bbfmw.lck
- %Application Data%\l.ks
- %Application Data%\gbepwiqj.xrw
- %Application Data%\xbxsuyol
- %User Temp%\pfwnjw.sd
- %User Temp%\ns{Random}.tmp\System.dll
(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.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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 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.)
It creates the following folders:
- %User Temp%\ns{Random}.tmp
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)
Other System Modifications
This Trojan adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %Desktop%\_HELP_instructions.bmp
Other Details
This Trojan connects to the following website to send and receive information:
- http://{Domain}/data/info.php
where {Domain} can be any of the following:- http://{BLOCKED}.{BLOCKED}.210.183
- http://{BLOCKED}.{BLOCKED}.55.171
- http://{BLOCKED}.{BLOCKED}.247.211
- {Domain Generated Algorithm}.{ru, info, biz, click, su, work, pl, org, pw, xyz}
It renames encrypted files using the following names:
- {unique ID per victim}-{identifier}.zepto
It deletes the initially executed copy of itself
It is capable of encrypting files in the affected system.
SOLUTION
9.800
12.739.50
26 Aug 2016
12.740.00
27 Aug 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
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Control Panel\Desktop
- Wallpaper = %Desktop%\_HELP_instructions.bmp
- Wallpaper = %Desktop%\_HELP_instructions.bmp
Step 5
Search and delete these folders
- %User Temp%\ns{Random}.tmp
Step 6
Search and delete these files
- %Application Data%\t.jat
- %Application Data%\bbfmw.lck
- %Application Data%\l.ks
- %Application Data%\gbepwiqj.xrw
- %Application Data%\xbxsuyol
- %User Temp%\pfwnjw.sd
- %User Temp%\ns{Random}.tmp\System.dll
Step 7
Reset your Desktop properties
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_LOCKY.R00JC0DHQ16. 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 9
Restore encrypted files from backup.
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