Gen.Variant.Buzy.1185_e06851fe78

Dynamic Analysis

Payload

Behaviour	Description
EmailWorm	Worm can send e-mails.

Process activity

The Trojan creates the following process(es):

regsvr32.exe:1492
mscorsvw.exe:1912

The Trojan injects its code into the following process(es):

%original file name%.exe:1776

Mutexes

The following mutexes were created/opened:

ZonesLockedCacheCounterMutexZonesCounterMutexZonesCacheCounterMutexWininetProxyRegistryMutexWininetConnectionMutexWininetStartupMutexc:!documents and settings!adm!local settings!history!history.ie5!c:!documents and settings!adm!cookies!_!MSFTHISTORY!_c:!documents and settings!adm!local settings!temporary internet files!content.ie5!RasPbFileShimCacheMutex

File activity

The process %original file name%.exe:1776 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%System%\dm.dll (3902 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OPQNSD2J\xbb[1].txt (21 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
C:\SkinH_EL.dll (88 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OPQNSD2J\desktop.ini (67 bytes)

Registry activity

The process regsvr32.exe:1492 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A2 D6 7F E4 79 74 47 DC 10 F1 FF 0D B1 48 E0 13"

[HKCR\dm.dmsoft\CLSID]
"(Default)" = "{26037A0E-7CBD-4FFF-9C63-56F2D0770214}"

[HKCR\Interface\{F3F54BC2-D6D1-4A85-B943-16287ECEA64C}\TypeLib]
"(Default)" = "{84288AAD-BA02-4EF2-85EC-3FAD4D11354D}"

[HKCR\TypeLib\{84288AAD-BA02-4EF2-85EC-3FAD4D11354D}\1.0\HELPDIR]
"(Default)" = "%System%\"

[HKCR\CLSID\{26037A0E-7CBD-4FFF-9C63-56F2D0770214}\InprocServer32]
"ThreadingModel" = "Apartment"

[HKCR\CLSID\{26037A0E-7CBD-4FFF-9C63-56F2D0770214}]
"(Default)" = "dm.dmsoft"

[HKCR\TypeLib\{84288AAD-BA02-4EF2-85EC-3FAD4D11354D}\1.0\FLAGS]
"(Default)" = "0"

[HKCR\dm.dmsoft]
"(Default)" = "dm.dmsoft"

[HKCR\Interface\{F3F54BC2-D6D1-4A85-B943-16287ECEA64C}]
"(Default)" = "Idmsoft"

[HKCR\dm.dmsoft\CurVer]
"(Default)" = "dm.dmsoft"

[HKCR\CLSID\{26037A0E-7CBD-4FFF-9C63-56F2D0770214}\ProgID]
"(Default)" = "dm.dmsoft"

[HKCR\Interface\{F3F54BC2-D6D1-4A85-B943-16287ECEA64C}\ProxyStubClsid32]
"(Default)" = "{00020424-0000-0000-C000-000000000046}"

[HKCR\Interface\{F3F54BC2-D6D1-4A85-B943-16287ECEA64C}\ProxyStubClsid]
"(Default)" = "{00020424-0000-0000-C000-000000000046}"

[HKCR\TypeLib\{84288AAD-BA02-4EF2-85EC-3FAD4D11354D}\1.0\0\win32]
"(Default)" = "%System%\dm.dll"

[HKCR\TypeLib\{84288AAD-BA02-4EF2-85EC-3FAD4D11354D}\1.0]
"(Default)" = "Dm"

[HKCR\CLSID\{26037A0E-7CBD-4FFF-9C63-56F2D0770214}\InprocServer32]
"(Default)" = "%System%\dm.dll"

[HKCR\Interface\{F3F54BC2-D6D1-4A85-B943-16287ECEA64C}\TypeLib]
"Version" = "1.0"

The process mscorsvw.exe:1912 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\.NETFramework\v2.0.50727\NGenService\State]
"AccumulatedWaitIdleTime" = "2340000"

The process %original file name%.exe:1776 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Directory" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path4]
"CacheLimit" = "65452"
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache4"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CacheLimit" = "65452"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

"Cookies" = "%Documents and Settings%\%current user%\Cookies"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache2"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKCU\Software\Microsoft\Multimedia\DrawDib]
"vga.drv 1024x768x32(BGR 0)" = "31,31,31,31"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKLM\System\CurrentControlSet\Hardware Profiles\0001\Software\Microsoft\windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CacheLimit" = "65452"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "3C 00 00 00 16 00 00 00 01 00 00 00 00 00 00 00"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "36 DB 85 6B FF F5 D2 CC 0A 2A E6 C4 43 0F 1C 39"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CacheLimit" = "65452"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"MigrateProxy" = "1"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"History" = "%Documents and Settings%\%current user%\Local Settings\History"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache3"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Paths" = "4"

The Trojan modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"UNCAsIntranet" = "1"

The Trojan modifies IE settings for security zones to map all web-nodes that bypassing the proxy to the Intranet Zone:

"ProxyBypass" = "1"

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Trojan modifies IE settings for security zones to map all urls to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"IntranetName" = "1"

The Trojan deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"
"ProxyServer"
"ProxyOverride"

Dropped PE files

MD5	File path
147127382e001f495d1842ee7a9e7912	c:\SkinH_EL.dll
e8889a55641fa57bcb588571f5bcbc63	c:\WINDOWS\system32\dm.dll

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

Removals

Remove it with Ad-Aware

1. Click (here) to download and install Ad-Aware Free Antivirus.
2. Update the definition files.
3. Run a full scan of your computer.

Manual removal*

1. Terminate malicious process(es) (How to End a Process With the Task Manager):

   regsvr32.exe:1492
   mscorsvw.exe:1912
   

2. Delete the original Trojan file.
   
3. Delete or disinfect the following files created/modified by the Trojan:

   %System%\dm.dll (3902 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OPQNSD2J\xbb[1].txt (21 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
   C:\SkinH_EL.dll (88 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OPQNSD2J\desktop.ini (67 bytes)

4. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
   
5. Reboot the computer.
   

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.

Static Analysis

VersionInfo

Company Name:
Product Name: CF??????
Product Version: 10.1.0.0
Legal Copyright: ?????? ????????
Legal Trademarks:
Original Filename:
Internal Name:
File Version: 10.1.0.0
File Description: ?????
Comments: ??????????(http://www.eyuyan.com)
Language: English (United States)

Company Name: Product Name: CF??????Product Version: 10.1.0.0Legal Copyright: ?????? ????????Legal Trademarks: Original Filename: Internal Name: File Version: 10.1.0.0File Description: ?????Comments: ??????????(http://www.eyuyan.com)Language: English (United States)

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	480658	483328	4.53626	3908cc489047d3bf48642814a859a6b4
.rdata	487424	2071086	2072576	5.45495	87f6854e0d4dd7dca333f6d72365206b
.data	2560000	253290	65536	3.39794	bcd645cfe9c08a9a81ad2a37e9c8ee9a
.rsrc	2813952	33896	36864	3.54139	da83dc56aaa035c9bc0b2a95ea740094

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
hxxp://hkvhost919.800cdn.com/xixi/bingwa/2.19.txt
hxxp://hkvhost919.800cdn.com/xbb.txt
hxxp://www.wei117.tk/xbb.txt	113.10.174.178
hxxp://www.wei117.tk/xixi/bingwa/2.19.txt	113.10.174.178

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

GET /xbb.txt HTTP/1.1

Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*

Referer: hXXp://VVV.wei117.tk/xbb.txt

Accept-Language: zh-cn

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)

Host: VVV.wei117.tk

Cache-Control: no-cache

HTTP/1.0 200 OK

C

GET /xixi/bingwa/2.19.txt HTTP/1.1

Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*

Referer: hXXp://VVV.wei117.tk/xixi/bingwa/2.19.txt

Accept-Language: zh-cn

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)

Host: VVV.wei117.tk

Cache-Control: no-cache

HTTP/1.0 404 Not Found

Cache-Control: private

Content-Type: text/html; charset=utf-8

Server: Microsoft-IIS/8.0

X-Powered-By: ASP.NET

Date: Fri, 12 Dec 2014 05:11:42 GMT

Content-Length: 4748

X-Cache: MISS from test.abc.com

X-Cache-Lookup: MISS from test.abc.com:80

Via: 1.0 test.abc.com (squid/3.0.STABLE20)

Connection: close

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "hXXp://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> .<html xmlns="hXXp://VVV.w3.org/1999/xhtml"> .<head> .<title>IIS 8.0 ............ - 404.0 - Not Found</title> .<style type="text/css"> .<!-- .body{margin:0;font-size:.7em;font-family:Verdana,Arial,Helvetica,sans-serif;} .code{margin:0;color:#006600;font-size:1.1em;font-weight:bold;} ..config_source code{font-size:.8em;color:#000000;} .pre{margin:0;font-size:1.4em;word-wrap:break-word;} .ul,ol{margin:10px 0 10px 5px;} .ul.first,ol.first{margin-top:5px;} .fieldset{padding:0 15px 10px 15px;word-break:break-all;} ..summary-container fieldset{padding-bottom:5px;margin-top:4px;} .legend.no-expand-all{padding:2px 15px 4px 10px;margin:0 0 0 -12px;} .legend{color:#333333;;margin:4px 0 8px -12px;_margin-top:0px; .font-weight:bold;font-size:1em;} .a:link,a:visited{color:#007EFF;font-weight:bold;} .a:hover{text-decoration:none;} .h1{font-size:2.4em;margin:0;color:#FFF;} .h2{font-size:1.7em;margin:0;color:#CC0000;} .h3{font-size:1.4em;margin:10px 0 0 0;color:#CC0000;} .h4{font-size:1.2em;margin:10px 0 5px 0; .}#header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS",Verdana,sans-serif; . color:#FFF;background-color:#5C87B2; .}#content{margin:0 0 0 2%;position:relative;} ..summary-container,.content-container{background:#FFF;width:96%;margin-top:8px;padding:10px;position:relative;} ..content-container p{margin:0 0 10px 0; .}#details-left{width:35%;float:

<<< skipped >>>

Map

The Trojan connects to the servers at the folowing location(s):

Strings from Dumps

%original file name%.exe_1776:

.text

.text

`.rdata

`.rdata

@.data

@.data

.rsrc

.rsrc

t$(SSh

t$(SSh

~%UVW

~%UVW

.tTPV

.tTPV

FTPjK

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FtPj;

FtPj;

F.PjRWj

F.PjRWj

u.WWj

u.WWj

u.VVj

u.VVj

u$SShe

u$SShe

wininet.dll

wininet.dll

SkinH_EL.dll

SkinH_EL.dll

psapi.dll

psapi.dll

HttpOpenRequestA

HttpOpenRequestA

HttpSendRequestA

HttpSendRequestA

HttpQueryInfoA

HttpQueryInfoA

hXXp://VVV.wei117.tk/xixi/bingwa/2.19.txt

hXXp://VVV.wei117.tk/xixi/bingwa/2.19.txt

hXXp://VVV.wei117.tk/xbb.txt

hXXp://VVV.wei117.tk/xbb.txt

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)

http=

http=

HTTP/1.1

HTTP/1.1

Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*

Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*

Content-Type: application/x-www-form-urlencoded

Content-Type: application/x-www-form-urlencoded

hXXp://

hXXp://

%s;7*

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