RANSOM_FLUFFY.A
Mal/FluffCryp-A(Sophos);Trojan.MSIL.BitCoin.jmi(Kaspersky);MSIL/Filecoder_Fluffy.A!tr(Fortinet)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 connects to certain websites to send and receive information.
TECHNICAL DETAILS
531,456 bytes
EXE
No
03 Apr 2017
Connects to URLs/IPs, Displays graphics/image, Displays message/message boxes, Encrypts files
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 the following files:
- {Malware Directory}\fluffy.png
Other System Modifications
This Ransomware adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\DHDSLZ
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\DHDSLZ
b = {Data receive from connection}
HKEY_LOCAL_MACHINE\SOFTWARE\DHDSLZ
t = {Time}
HKEY_LOCAL_MACHINE\SOFTWARE\DHDSLZ
k = {Objectvalue}
HKEY_LOCAL_MACHINE\SOFTWARE\DHDSLZ
g = {Aes encrypt of bananasplit}
HKEY_LOCAL_MACHINE\SOFTWARE\DHDSLZ
f = {Flag}
HKEY_LOCAL_MACHINE\SOFTWARE\DHDSLZ
l = {Language}
Other Details
This Ransomware connects to the following website to send and receive information:
- http://{BLOCKED}c4ajyk4ccb.onion.to/w.php
It encrypts files with the following extensions:
- .3fr
- .7z
- .DTD
- .PAS
- .RAW
- .abu
- .accdb
- .ai
- .arp
- .arw
- .asp
- .aspx
- .ass
- .asset
- .ava
- .avi
- .bas
- .bay
- .bdcr
- .bdcu
- .bdd
- .bdp
- .bds
- .bikey
- .blend
- .bmp
- .bpdr
- .bpdu
- .bsdr
- .bsdu
- .c
- .cc
- .cd
- .cdr
- .cer
- .class
- .com
- .config
- .cpp
- .cr2
- .crt
- .crw
- .cs
- .csv
- .cxx
- .db
- .dbf
- .dbx
- .dcr
- .dd
- .dds
- .der
- .dng
- .doc
- .docm
- .docx
- .dwg
- .dxf
- .dxg
- .eps
- .erf
- .fdb
- .forge
- .gdb
- .gif
- .groups
- .gsd
- .gsf
- .h
- .hpp
- .htm
- .html
- .ims
- .indd
- .iss
- .jar
- .java
- .jpe
- .jpeg
- .jpg
- .js
- .jsp
- .kdc
- .key
- .kwm
- .lua
- .m
- .md
- .mdb
- .mdf
- .mef
- .mp3
- .mpg
- .mrw
- .msg
- .nef
- .nrw
- .oab
- .obj
- .odb
- .odm
- .odp
- .ods
- .odt
- .orf
- .ost
- .p12
- .p7b
- .p7c
- .pab
- .pas
- .pdb
- .pdd
- .pef
- .pem
- .pfx
- .php
- .pl
- .png
- .ppk
- .ppt
- .pptm
- .pptx
- .ps
- .psd
- .pst
- .psw
- .ptx
- .pwm
- .py
- .r3d
- .raf
- .rar
- .raw
- .rgx
- .rik
- .rm
- .rtf
- .rw2
- .rwl
- .safe
- .sav
- .sln
- .sql
- .srf
- .srw
- .swf
- .swift
- .tex
- .txt
- .vcf
- .vsd
- .wb2
- .wpd
- .wps
- .xcf
- .xlk
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xml
- .zip
It renames encrypted files using the following names:
- {Original File Name and Extension}.{Number}.lock75
It does the following:
- Encrypts files in %Desktop%\testenc
The ransomware displays the following window:
English version:
French version:
Displayed info regarding decryption of files:
Dropped fluffy.png image:
SOLUTION
9.850
13.316.04
03 Apr 2017
13.317.00
04 Apr 2017
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 key
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.
- HKEY_LOCAL_MACHINE\SOFTWARE\DHDSLZ
Step 5
Search and delete this file
- {Malware Directory}\fluffy.png
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_FLUFFY.A. 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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