![Trend Micro Security](https://www.trendmicro.com/content/dam/trendmicro/global/en/global/logo/logo-desktop.png)
RANSOM.WIN32.GANDCRAB.B
Trojan-Ransom.Win32.GandCrypt.fbd (Kaspersky), Ran-GandCrabv4!C3405362BEB3 (McAfee), Ransom:Win32/GandCrab.AZ (Microsoft)
Windows
![](/vinfo/imgFiles/JPlegend.jpg)
- マルウェアタイプ: 身代金要求型不正プログラム(ランサムウェア)
- 破壊活動の有無: なし
- 暗号化: はい
- 感染報告の有無: はい
概要
マルウェアは、脅迫状を作成します。
マルウェアは、他のマルウェアに作成されるか、悪意あるWebサイトからユーザが誤ってダウンロードすることによりコンピュータに侵入します。
マルウェアは、特定のWebサイトにアクセスし、情報を送受信します。 マルウェアは、特定の脆弱性を利用した感染活動を実行します。 マルウェアは、実行後、自身を削除します。
詳細
侵入方法
マルウェアは、他のマルウェアに作成されるか、悪意あるWebサイトからユーザが誤ってダウンロードすることによりコンピュータに侵入します。
インストール
マルウェアは、以下のファイルを作成します。
- %User Temp%\pidor.bmp
- {Encrypted Folder}\{Random}-DECRYPT.txt
(註:%User Temp%フォルダは、現在ログオンしているユーザの一時フォルダです。Windows 2000、XP、Server 2003の場合、通常 "C:\Documents and Settings\<ユーザー名>\Local Settings\Temp"です。また、Windows Vista、7、8の場合、通常 "C:\Users\<ユーザ名>\AppData\Local\Temp" です。)
マルウェアは、以下の Mutex を作成し、メモリ上で自身の重複実行を避けます。
- Global\{Hex Values}.lock
他のシステム変更
マルウェアは、以下のレジストリ値を追加します。
HKEY_LOCAL_MACHINE\SOFTWARE\ex_data\
data
ext = {Hex Values}
HKEY_LOCAL_MACHINE\SOFTWARE\keys_data\
data
public = {KEY}
HKEY_LOCAL_MACHINE\SOFTWARE\keys_data\
data
private = {KEY}
マルウェアは、以下のレジストリ値を変更し、デスクトップの壁紙を変更します。
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%User Temp%\pidor.bmp"
マルウェアは、コンピュータのデスクトップの壁紙に以下の画像を設定します。
プロセスの終了
マルウェアは、感染コンピュータ上で以下のプロセスが常駐されていることを確認した場合、そのプロセスを終了します。
- msftesql.exe
- sqlagent.exe
- sqlbrowser.exe
- sqlwriter.exe
- oracle.exe
- ocssd.exe
- dbsnmp.exe
- synctime.exe
- agntsvc.exe
- isqlplussvc.exe
- xfssvccon.exe
- sqlservr.exe
- mydesktopservice.exe
- ocautoupds.exe
- agntsvc.exe
- agntsvc.exe
- agntsvc.exe
- encsvc.exe
- firefoxconfig.exe
- tbirdconfig.exe
- mydesktopqos.exe
- ocomm.exe
- mysqld.exe
- mysqld-nt.exe
- mysqld-opt.exe
- dbeng50.exe
- sqbcoreservice.exe
- excel.exe
- infopath.exe
- msaccess.exe
- mspub.exe
- onenote.exe
- outlook.exe
- powerpnt.exe
- steam.exe
- thebat.exe
- thebat64.exe
- thunderbird.exe
- visio.exe
- winword.exe
- wordpad.exe
情報漏えい
マルウェアは、以下の情報を収集します。
- Username
- Computer Name
- Network Information
- System Language
- Machine Keyboard Layout
- OS Version and Platform
- AV Products Installed
- Processor Information
- IP Address
- Drives Information (Nerwork or Local)
- Ransom ID
- GandCrab Internal Info:
- id
- sub_id
- version
- action
その他
マルウェアは、以下のWebサイトにアクセスし、情報を送受信します。
- http://{URL}/{string1}/{string2}/{string3}.{string4}
- Where URL is equal to the following:
- www.{BLOCKED}impex.com
- www.{BLOCKED}egrise.eu
- www.{BLOCKED}g.com
- {BLOCKED}photo.ru
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- www.{BLOCKED}undation.gm
- www.{BLOCKED}tfunnelblueprint.com
- www.{BLOCKED}ear.com
- {BLOCKED}da74.ru
- {BLOCKED}t.net
- {BLOCKED}babyphotographyseattle.com
- {BLOCKED}m.be
- {BLOCKED}owradio.com
- {BLOCKED}p.com
- {BLOCKED}t.fr
- {BLOCKED}emi.com
- www.{BLOCKED}v.hu
- www.{BLOCKED}d.cz
- {BLOCKED}n.cn
- {BLOCKED}d.website
- {BLOCKED}inen.com
- {BLOCKED}mores.com.br
- {BLOCKED}n.dk
- {BLOCKED}a.co.uk
- www.{BLOCKED}s.co.th
- {BLOCKED}tplus.ru
- {BLOCKED}s.vn
- {BLOCKED}isleri.com
- www.{BLOCKED}viacao.com.br
- www.{BLOCKED}t.in
- www.{BLOCKED}tedelixir.com
- www.{BLOCKED}agrp.com
- {BLOCKED}me-fishing-croatia.hr
- {BLOCKED}onacif.com
- www.{BLOCKED}ssconnect.com
- {BLOCKED}edding.ru
- {BLOCKED}t.{BLOCKED}view.com
- {BLOCKED}rica.com.mx
- {BLOCKED}l.com.ve
- {BLOCKED}ns.com.vn
- {BLOCKED}alm.eu
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- {BLOCKED}l.by
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- {BLOCKED}hrtek.yourcloud.cz
- www.{BLOCKED}o.ir
- www.{BLOCKED}ansport.fr !--BLOCKED www.classtransport.fr -->
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- www.{BLOCKED}orideas9.com
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- {BLOCKED}flirtings.com
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- {BLOCKED}vanlines.com
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- {BLOCKED}enceiling.com.hk
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- {BLOCKED}.{BLOCKED}ow.com.br
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- {BLOCKED}O.com
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- {BLOCKED}r.ro
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- {BLOCKED}s.ir
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- {BLOCKED}sdrive.com
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- {BLOCKED}media.cf
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- {BLOCKED}ide.es
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- {BLOCKED}rma.com
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- {BLOCKED}ravel.com
- {BLOCKED}thangz.com
- {BLOCKED}arroy.fr
- {BLOCKED}aworld.signupvideo.com
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- {BLOCKED}toshow.com
- {BLOCKED}l.world
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- {BLOCKED}ormervn.com
- {BLOCKED}ne-city-ciputra.net
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- {BLOCKED}larsisters.ca
- {BLOCKED}phamgia.com
- {BLOCKED}.dk
- {BLOCKED}school.com.br
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- www.{BLOCKED}organizasyon.com
- {BLOCKED}y.com
- {BLOCKED}diovisual.com
- {BLOCKED}adental.com.au
- {BLOCKED}age_pedik.com
- Where string1 is equal to the following:
- wp-content
- static
- content
- includes
- data
- uploads
- news
- Where string2 is equal to the following:
- images
- pictures
- image
- graphic
- assets
- pics
- imgs
- tmp
- Where string3 is equal to the combination of the following:
- im
- de
- ka
- ke
- am
- es
- so
- fu
- se
- da
- he
- ru
- me
- mo
- th
- zu
- Where string4 is equal to the following:
- jpg
- png
- gif
- bmp
マルウェアは、以下の脆弱性を利用して感染活動を実行します。
- CVE-2018-8120 | Win32k Elevation of Privilege Vulnerability
- CVE-2018-8440 | Windows ALPC Elevation of Privilege Vulnerability
マルウェアは、実行後、自身を削除します。
ランサムウェアの不正活動
マルウェアは、ファイル名に以下の文字列を含むファイルの暗号化はしません。
- desktop.ini
- autorun.inf
- ntuser.dat
- iconcache.db
- bootsect.bak
- boot.ini
- ntuser.dat.log
- Thumbs.db
- KRAB-DECRYPT.html
- KRAB-DECRYPT.txt
- CRAB-DECRYPT.txt
- ntldr
- NTDETECT.COM
- Bootfont.bin
マルウェアは、以下のフォルダ内で確認されたファイルの暗号化はしません。
- ProgramData
- IETldCache
- Boot
- Program Files
- Tor Browser
- All Users
- Local Settings
- Windows
- %Windows%
- %AppDataLocal%
- %Program Files%\Common Files
- %Program Files%
(註:%Windows%フォルダは、Windowsが利用するフォルダで、いずれのオペレーティングシステム(OS)でも通常、"C:\Windows" です。.. %AppDataLocal%フォルダは、ローカルアプリケーションデータフォルダです。Windows 2000、XP、Server 2003の場合、通常 "C:\Documents and Settings\<ユーザ名>\Local Settings\Application Data" です。また、Windows Vista、7、8の場合、通常 "C:\Users\<ユーザ名>\AppData\Local" です。. %Program Files%フォルダは、デフォルトのプログラムファイルフォルダです。Windows 2000、Server 2003、XP(32-bit),Vista(32-bit)、7(32-bit)、8(32-bit)の場合、通常 "C:\Program Files"です。また、Windows XP(64-bit)、Vista(64-bit)、7(64-bit)、8(64-bit)の場合、通常 "C:\Program Files(x86)" です。)
マルウェアは、暗号化されたファイルのファイル名に以下の拡張子を追加します。
- .{Random}
マルウェアが作成する以下のファイルは、脅迫状です。
- {Random}-DECRYPT.txt
<補足>
- 文字列1 は、以下のいずれかの文字列の組み合わせが当てはまります。
- wp-content
- static
- content
- includes
- data
- uploads
- news
- 文字列2 は、以下のいずれかの文字列の組み合わせが当てはまります。
- images
- pictures
- image
- graphic
- assets
- pics
- imgs
- tmp
- 文字列3 は、以下のいずれかの文字列の組み合わせが当てはまります。
- im
- de
- ka
- ke
- am
- es
- so
- fu
- se
- da
- he
- ru
- me
- mo
- th
- zu
- 文字列4 は、以下のいずれかの文字列の組み合わせが当てはまります。
- jpg
- png
- gif
- bmp
マルウェアは以下を実行します。
- マルウェアは、以下の拡張子ファイルの暗号化はしません。
- .ani
- .cab
- .cpl
- .cur
- .diagcab
- .diagpkg
- .dll
- .drv
- .lock
- .hlp
- .ldf
- .icl
- .icns
- .ico
- .ics
- .lnk
- .key
- .idx
- .mod
- .mpa
- .msc
- .msp
- .msstyles
- .msu
- .nomedia
- .ocx
- .prf
- .rom
- .rtp
- .scr
- .shs
- .spl
- .sys
- .theme
- .themepack
- .exe
- .bat
- .cmd
- .gandcrab
- .KRAB
- .CRAB
- .zerophage_i_like_your_pictures
- シャドウコピーを削除します。
- 以下のウイルス対策およびセキュリティアプリケーションの存在を確認します。
- AVP.EXE
- ekrn.exe
- avgnt.exe
- ashDisp.exe
- NortonAntiBot.exe
- Mcshield.exe
- avengine.exe
- cmdagent.exe
- smc.exe
- persfw.exe
- pccpfw.exe
- fsguiexe.exe
- cfp.exe
- msmpeng.exe
対応方法
手順 1
Windows XP、Windows Vista および Windows 7 のユーザは、コンピュータからマルウェアもしくはアドウェア等を完全に削除するために、ウイルス検索の実行前には必ず「システムの復元」を無効にしてください。
手順 2
このマルウェアもしくはアドウェア等の実行により、手順中に記載されたすべてのファイル、フォルダおよびレジストリキーや値がコンピュータにインストールされるとは限りません。インストールが不完全である場合の他、オペレーティングシステム(OS)の条件によりインストールがされない場合が考えられます。手順中に記載されたファイル/フォルダ/レジストリ情報が確認されない場合、該当の手順の操作は不要ですので、次の手順に進んでください。
手順 3
Windowsをセーフモードで再起動します。
手順 4
このレジストリ値を削除します。
警告:レジストリはWindowsの構成情報が格納されているデータベースであり、レジストリの編集内容に問題があると、システムが正常に動作しなくなる場合があります。
レジストリの編集はお客様の責任で行っていただくようお願いいたします。弊社ではレジストリの編集による如何なる問題に対しても補償いたしかねます。
レジストリの編集前にこちらをご参照ください。
- In HKEY_LOCAL_MACHINE\SOFTWARE\ex_data\data
- ext = {Hex Values}
- ext = {Hex Values}
- In HKEY_LOCAL_MACHINE\SOFTWARE\keys_data\data
- public = {KEY}
- public = {KEY}
- In HKEY_LOCAL_MACHINE\SOFTWARE\keys_data\data
- private = {KEY}
- private = {KEY}
手順 5
以下のファイルを検索し削除します。
- %User Temp%\pidor.bmp
- {Encrypted Folder}\{Random}-DECRYPT.txt
手順 6
コンピュータを通常モードで再起動し、最新のバージョン(エンジン、パターンファイル)を導入したウイルス対策製品を用い、「RANSOM.WIN32.GANDCRAB.B」と検出したファイルの検索を実行してください。 検出されたファイルが、弊社ウイルス対策製品により既に駆除、隔離またはファイル削除の処理が実行された場合、ウイルスの処理は完了しており、他の削除手順は特にありません。
手順 8
最新のバージョン(エンジン、パターンファイル)を導入したウイルス対策製品を用い、ウイルス検索を実行してください。「RANSOM.WIN32.GANDCRAB.B」と検出したファイルはすべて削除してください。 検出されたファイルが、弊社ウイルス対策製品により既に駆除、隔離またはファイル削除の処理が実行された場合、ウイルスの処理は完了しており、他の削除手順は特にありません。
手順 9
デスクトッププロパティを修正します。
ご利用はいかがでしたか? アンケートにご協力ください