PUA.Win32.Youjiu.A

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application creates the following folders:

• %User Profile%\Documents\StarCraft II\Replays
• %User Profile%\Documents\StarCraft II
• %User Temp%\U9SC2SH
• %User Profile%\Documents\StarCraft II\Replays\Multiplayer\U9\xe6\x98\x9f\xe9\x99\x852\xe8\xb6\x85\xe7\xba\xa7\xe5\x8a\xa9\xe6\x89\x8b\xe4\xb8\x8b\xe8\xbd\xbd\xe5\xbd\x95\xe5\x83\x8f
• %User Profile%\Documents\StarCraft II\Replays\Multiplayer

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Potentially Unwanted Application deletes the following files:

• %User Temp%\U9SC2SH\ChangLog.txt

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
U9SC2SH\shell\open\
command
(Default) = "{malware file path and name} %1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
U9SC2SH
URL Protocol = ""

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
U9SC2SH
(Default) = "URL:U9SC2SHProtocol"

HKEY_CURRENT_USER\Software\Microsoft\
Multimedia\DrawDib
1440x900x32(BGR 0) = "31,31,31,31"

Dropping Routine

This Potentially Unwanted Application drops the following files:

• %User Temp%\U9SC2SH\SkinHu.dll
• %AppDataLocal%\Microsoft\Internet Explorer\MSIMGSIZ.DAT
• %User Temp%\U9SC2SH\u9sc2sh.she

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Potentially Unwanted Application connects to the following possibly malicious URL:

• http://s8.{BLOCKED}e.uuu9.com/Update/ChangeLog.txt
• http://sc2.{BLOCKED}9.com/zs_down.html
• http://sc2.{BLOCKED}9.com/zs_news.html
• http://sc2.{BLOCKED}9.com/skin1027/images/master.css
• http://sc2.{BLOCKED}9.com/skin1027/images/jquery.js
• http://image.{BLOCKED}9.com/{random path}
• http://s22.{BLOCKED}z.com/stat.php?id=4998890&web_id=4998890
• http://s22.{BLOCKED}z.com/stat.php?id=4995947&web_id=4995947
• http://sc2.{BLOCKED}9.com/skin1027/images/yingzi.js
• http://s21.{BLOCKED}z.com/stat.php?id=4990579&web_id=4990579
• http://s20.{BLOCKED}z.com/stat.php?id=3050057&web_id=3050057
• http://sc2.{BLOCKED}9.com/skin1027/images/toolui.png
• http://sc2.{BLOCKED}9.com/skin1027/images/toolui2.png
• http://rep.{BLOCKED}9.com/GetSrc2Info.ashx?{random characters}
• http://sc2.{BLOCKED}9.com/skin1027/images/dot.png
• http://gzs20.{BLOCKED}z.com/stat.htm?{random characters}
• http://hzs22.{BLOCKED}z.com/stat.htm?{random characters}
• http://c.{BLOCKED}z.com/core.php?web_id=4998890&t=z
• http://c.{BLOCKED}z.com/core.php?web_id=4995947&t=z
• http://cnzz.{BLOCKED}t.com/9.gif?abc=1&rnd=766823109
• http://pcookie.{BLOCKED}z.com/app.gif?&cna=ABJWF/di4DECAQgke8zfC1Hk
• http://c.{BLOCKED}z.com/core.php?web_id=4990579&t=z
• http://hzs21.{BLOCKED}z.com/stat.htm?{random characters}
• http://c.{BLOCKED}z.com/core.php?web_id=3050057&t=z
• http://cnzz.{BLOCKED}t.com/9.gif?abc=1&rnd=901112179
• {BLOCKED}.102.19

This report is generated via an automated analysis system.