Ransom_FILESLOCKER.THAABGAH

 Analysis by: Henry Alarcon Jr.

 ALIASES:

Ransom:MSIL/BlackHeart!MTB (Microsoft), Generic.Ransom.WCryG.4E7E46EF (BitDefender)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

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 encrypts files found in specific folders. It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

216,064 bytes

File Type:

EXE

Memory Resident:

No

Payload:

Connects to URLs/IPs, Displays message/message boxes, Displays graphics/image, 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 adds the following processes:

  • cmd.exe /c vssadmin.exe Delete Shadows /All /Quiet

Other System Modifications

This Ransomware sets the system's desktop wallpaper to the following image:

  • %Desktop%\WallPaper.bmp

Download Routine

This Ransomware accesses the following websites to download files:

  • http://{BLOCKED}e.co.nz/i/bltujirf.pto.bmp

It saves the files it downloads using the following names:

  • %Desktop%\WallPaper.bmp

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista, 7, and 8.)

Other Details

This Ransomware encrypts files with the following extensions:

  • .gif
  • .apk
  • .groups
  • .hdd
  • .hpp
  • .log
  • .m2ts
  • .m4p
  • .mkv
  • .mpeg
  • .epub
  • .yuv
  • .ndf
  • .nvram
  • .ogg
  • .ost
  • .pab
  • .pdb
  • .pif
  • .png
  • .qed
  • .qcow
  • .otp
  • .s3db
  • .qcow2
  • .rvt
  • .st7
  • .stm
  • .vbox
  • .vdi
  • .vhd
  • .vhdx
  • .vmdk
  • .vmsd
  • .psafe3
  • .vmx
  • .vmxf
  • .3fr
  • .3pr
  • .ab4
  • .accde
  • .accdr
  • .accdt
  • .ach
  • .acr
  • .sd0
  • .sxw
  • .adb
  • .advertisements
  • .agdl
  • .ait
  • .apj
  • .asm
  • .awg
  • .back
  • .backup
  • .sti
  • .oil
  • .backupdb
  • .bay
  • .bdb
  • .bgt
  • .bik
  • .bpw
  • .cdr3
  • .cdr4
  • .cdr5
  • .cdr6
  • .ycbcra
  • .cdrw
  • .ce1
  • .ce2
  • .cib
  • .craw
  • .crw
  • .csh
  • .csl
  • .db_journal
  • .dc2
  • .pptm
  • .dcs
  • .ddoc
  • .ddrw
  • .der
  • .des
  • .dgc
  • .djvu
  • .dng
  • .drf
  • .eml
  • .ppt
  • .erbsql
  • .erf
  • .exf
  • .ffd
  • .fh
  • .fhd
  • .flp
  • .gray
  • .grey
  • .gry
  • .hbk
  • .ibd
  • .7z
  • .ibz
  • .iiq
  • .incpas
  • .jpe
  • .kc2
  • .kdbx
  • .kdc
  • .kpdx
  • .ldf
  • .lua
  • .mdc
  • .mdf
  • .mef
  • .config
  • .mfw
  • .mmw
  • .mny
  • .mrw
  • .myd
  • .ndd
  • .nef
  • .nk2
  • .nop
  • .vb
  • .vip
  • .vbs
  • .sln
  • .dxg
  • .bat
  • .cmd
  • .jar
  • .c4d
  • .ape
  • .nrw
  • .ns2
  • .ns3
  • .ldf
  • .ns4
  • .nwb
  • .nx2
  • .nxl
  • .nyf
  • .odb
  • .odf
  • .odg
  • .odm
  • .orf
  • .otg
  • .oth
  • .py
  • .ots
  • .ott
  • .p12
  • .p7b
  • .p7c
  • .pdd
  • .pem
  • .plus_muhd
  • .plc
  • .pot
  • .pptx
  • .py
  • .qba
  • .qbr
  • .qbw
  • .qbx
  • .qby
  • .raf
  • .rat
  • .raw
  • .rdb
  • .rwl
  • .rwz
  • .conf
  • .sda
  • .sdf
  • .sqlite
  • .sqlite3
  • .sqlitedb
  • .sr2
  • .srf
  • .srw
  • .st5
  • .st8
  • .std
  • .stx
  • .sxd
  • .sxg
  • .sxi
  • .sxm
  • .tex
  • .wallet
  • .wb2
  • .wpd
  • .x11
  • .x3f
  • .xis
  • .ARC
  • .contact
  • .dbx
  • .doc
  • .docx
  • .jnt
  • .jpg
  • .msg
  • .oab
  • .ods
  • .pdf
  • .pps
  • .ppsm
  • .prf
  • .pst
  • .rar
  • .rtf
  • .txt
  • .wab
  • .xls
  • .xlsx
  • .xml
  • .zip
  • .1cd
  • .3ds
  • .3g2
  • .7zip
  • .accdb
  • .aoi
  • .asf
  • .asp
  • .aspx
  • .asx
  • .avi
  • .bak
  • .cer
  • .cfg
  • .class
  • .cs
  • .css
  • .csv
  • .db
  • .dds
  • .dwg
  • .dxf
  • .flf
  • .flv
  • .html
  • .idx
  • .js
  • .key
  • .kwm
  • .laccdb
  • .lit
  • .m3u
  • .mbx
  • .md
  • .mdf
  • .mid
  • .mlb
  • .mov
  • .mp3
  • .mp4
  • .mpg
  • .obj
  • .odt
  • .pages
  • .php
  • .psd
  • .pwm
  • .rm
  • .safe
  • .sav
  • .save
  • .sql
  • .srt
  • .swf
  • .thm
  • .vob
  • .wav
  • .wma
  • .wmv
  • .xlsb
  • .3dm
  • .aac
  • .ai
  • .arw
  • .c
  • .cdr
  • .cls
  • .cpi
  • .cpp
  • .cs
  • .db3
  • .docm
  • .dot
  • .dotm
  • .dotx
  • .drw
  • .dxb
  • .eps
  • .fla
  • .flac
  • .fxg
  • .java
  • .jtp
  • .m
  • .m4v
  • .max
  • .mdb
  • .pcd
  • .pct
  • .pl
  • .potm
  • .potx
  • .ppam
  • .ppsm
  • .ppsx
  • .pptm
  • .ps
  • .r3d
  • .rw2
  • .sldm
  • .sldx
  • .svg
  • .tga
  • .wps
  • .xla
  • .xlam
  • .xlm
  • .xlr
  • .xlsm
  • .xlt
  • .xltm
  • .xltx
  • .xlw
  • .act
  • .adp
  • .al
  • .dip
  • .docb
  • .frm
  • .gpg
  • .jsp
  • .lay
  • .lay6
  • .m4u
  • .mml
  • .myi
  • .onetoc2
  • .PAQ
  • .ps1
  • .sch
  • .slk
  • .snt
  • .suo
  • .tgz
  • .tif
  • .tiff
  • .txt
  • .uop
  • .uot
  • .vcd
  • .wk1
  • .wks
  • .xlc

It does the following:

  • After encrypting it connects to the following URL(s):
      https://{BLOCKED}er.org/2vMGg5
    • That will redirect and display the following:
        http://image.{BLOCKED}r.com/image/8HOoBEyeRDSNF8QbtaoD0A.png
  • Displays a message after encrypting files:

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • %All Drives% ← Except System Drive, it only encrypts files on the following folders found in System Dive:
    • %Desktop%
    • %Favorites%
    • %All Users Profile%
    • %User Profile%
    • %User Profile%\Desktop
    • %User Profile%\Documents
    • %User Profile%\Downloads
    • %User Profile%\Pictures
    • %User Profile%\Music
    • %User Profile%\Searches
    • %User Profile%\Videos
    • %System Root%\Users
    • %AppDataLocal%\Microsoft\Windows\History

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.)

It appends the following extension to the file name of the encrypted files:

  • .[fileslocker@{BLOCKED}m.me]

It drops the following file(s) as ransom note:

  • %Desktop%\#解密我的文件#.txt
  • {All Drives}\#解密我的文件#.txt
  • {All Drives}\#DECRYPT MY FILES#.txt
  • %Desktop%\#DECRYPT MY FILES#.txt

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.652.03

FIRST VSAPI PATTERN DATE:

27 Nov 2018

VSAPI OPR PATTERN File:

14.653.00

VSAPI OPR PATTERN Date:

28 Nov 2018

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_FILESLOCKER.THAABGAH

[ Learn More ]
  1. 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.
  2. 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.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Desktop%\WallPaper.bmp
  • %Desktop%\#解密我的文件#.txt
  • %All Drives%\#解密我的文件#.txt
  • %Desktop%\#DECRYPT MY FILES#.txt
  • %All Drives%\#DECRYPT MY FILES#.txt

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom_FILESLOCKER.THAABGAH. 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 the following Trend Micro Support pages for more information:

Step 6

Restore encrypted files from backup.


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