RANSOM_NANOLOCKER.B
Ransom.NanoLocker (NORTON); Gen:Variant.Razy.90557 (BITDEFENDER); Ransomware-FCO!FCE023BE1FB2 (NAI)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It encrypts files with specific file extensions. It encrypts files found in specific folders. It drops files as ransom note.
TECHNICAL DETAILS
Arrival Details
This Ransomware 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 Ransomware drops a copy of itself in the following folders using different file names:
- %AppDataLocal%\lansrv.exe
(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.)
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
LanmanServer = %AppDataLocal%\lansrv.exe
Other Details
This Ransomware drops the following file(s)/component(s):
- %AppDataLocal%\lansrv.ini - contains list of encrypted files
- %Desktop%\Decryptor.lnk - shortcut to malware copy
(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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 does the following:
- After encryption, the shortcut to malware copy is executed and displays the following:
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .jpg
- .jpeg
- .tif
- .bmp
- .max
- .accdb
- .dbf
- .mdb
- .pdb
- .sql
- .sav
- .spv
- .grle
- .mlx
- .game
- .slot
- .dwg
- .dxf
- .cpp
- .php
- .asp
- .java
- .jar
- .class
- .aaf
- .aep
- .aepx
- .plb
- .prel
- .prproj
- .aet
- .ppj
- .psd
- .indd
- .indl
- .indt
- .indb
- .inx
- .idml
- .pmd
- .xqx
- .eps
- .svg
- .swf
- .fla
- .doc
- .dot
- .docx
- .docm
- .dotx
- .dotm
- .docb
- .rtf
- .wpd
- .wps
- .msg
- .xls
- .xlt
- .xlm
- .xlsx
- .xlsm
- .xltx
- .xltm
- .xlsb
- .xla
- .xlam
- .xll
- .xlw
- .ppt
- .pot
- .pps
- .pptx
- .pptm
- .potx
- .potm
- .ppam
- .ppsx
- .ppsm
- .sldx
- .sldm
- .wav
- .aif
- .iff
- .mid
- .mpa
- .wma
- .avi
- .mov
- .mpeg
- .asf
- .asx
- .flv
- .mpg
- .wmv
- .vob
- .csv
- .efx
- .sdf
- .vcf
- .xml
- .crt
- .pem
- .cer
- .pfx
- .odt
- .ods
- .odp
- .odm
- .odb
- .odc
- .xlk
- .dxg
- .pst
- .mdf
- .cdr
- .arw
- .dng
- .rar
- .zip
- .srf
- .bay
- .crw
- .dcr
- .kdc
- .erf
- .mef
- .mrw
- .nef
- .nrw
- .orf
- .raf
- .raw
- .rwl
- .ptx
- .pef
- .srw
- .der
It encrypts files found in the following folders:
- {Drive Letter}:\
It drops the following file(s) as ransom note:
- %Desktop%\ATTENTION.RTF
SOLUTION
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
Identify and terminate files detected as RANSOM_NANOLOCKER.B
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
Restart in Safe Mode
Step 5
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\Software\Microsoft\Windows\CurrentVersion\Run
- LanmanServer = %AppDataLocal%\lansrv.exe
- LanmanServer = %AppDataLocal%\lansrv.exe
Step 6
Search and delete these files
- %AppDataLocal%\lansrv.exe
- %AppDataLocal%\lansrv.ini
- %Desktop%\ATTENTION.RTF
- %Desktop%\Decryptor.lnk
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_NANOLOCKER.B. 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 8
Restore encrypted files from backup.
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