Gen.Variant.Buzy.1185_6beeebd4f2

Dynamic Analysis

Payload

Behaviour	Description
EmailWorm	Worm can send e-mails.

Process activity

The Trojan creates the following process(es):

regsvr32.exe:1272

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

%original file name%.exe:384

Mutexes

The following mutexes were created/opened:No objects were found.

File activity

The process %original file name%.exe:384 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\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\4DQJW9YN\xbb[1].txt (21 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\4DQJW9YN\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\WLMVCPYN\2.21[1].txt (1 bytes)
C:\SkinH_EL.dll (88 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\WLMVCPYN\desktop.ini (67 bytes)

Registry activity

The process regsvr32.exe:1272 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "6A 71 34 D3 0E C6 EE A9 FD 7E C8 57 E7 A8 FD A4"

[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 %original file name%.exe:384 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 17 00 00 00 01 00 00 00 00 00 00 00"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "F5 43 09 85 0E F8 01 E4 C4 41 39 41 94 4E 1B 18"

[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:1272
   

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\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\4DQJW9YN\xbb[1].txt (21 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\4DQJW9YN\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\WLMVCPYN\2.21[1].txt (1 bytes)
   C:\SkinH_EL.dll (88 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\WLMVCPYN\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: Language Neutral

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: Language Neutral

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	480658	483328	4.53636	1a975b90290cc931e3dd465557765128
.rdata	487424	2071086	2072576	5.45495	a45518c9c8e01e015d5676bf1d95258f
.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:

Total found: 2
e06851fe782fc88c89803ef8ed15a381
9d26fc4d7c3fafac9e62f6aef7676004

Network Activity

URLs

URL	IP
hxxp://hkvhost919.800cdn.com/xixi/bingwa/2.21.txt
hxxp://hkvhost919.800cdn.com/xbb.txt
hxxp://www.wei117.tk/xbb.txt	113.10.174.178
hxxp://www.wei117.tk/xixi/bingwa/2.21.txt	113.10.174.178

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

GET /xixi/bingwa/2.21.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/2.21.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

Content-Type: text/plain

Last-Modified: Sun, 14 Sep 2014 02:10:14 GMT

Accept-Ranges: bytes

ETag: "087345c1cfcf1:0"

Server: Microsoft-IIS/8.0

X-Powered-By: ASP.NET

Date: Sat, 13 Dec 2014 15:20:04 GMT

Content-Length: 1

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

1..

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

Content-Type: text/plain

Last-Modified: Mon, 20 Oct 2014 14:02:00 GMT

Accept-Ranges: bytes

ETag: "938736b6eeccf1:0"

Server: Microsoft-IIS/8.0

X-Powered-By: ASP.NET

Date: Sat, 13 Dec 2014 15:20:05 GMT

Content-Length: 21

X-Cache: MISS from test.abc.com

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

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

Connection: close

hXXp://VVV.wei7x8o.tk..

Map

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

Strings from Dumps

%original file name%.exe_384:

.text

.text

`.rdata

`.rdata

@.data

@.data

.rsrc

.rsrc

t$(SSh

t$(SSh

~%UVW

~%UVW

.tTPV

.tTPV

FTPjK

FTPjK

FtPj;

FtPj;

F.PjRWj

F.PjRWj

u.WWj

u.WWj

u.VVj

u.VVj

u$SShe

u$SShe

psapi.dll

psapi.dll

wininet.dll

wininet.dll

SkinH_EL.dll

SkinH_EL.dll

HttpOpenRequestA

HttpOpenRequestA

HttpSendRequestA

HttpSendRequestA

HttpQueryInfoA

HttpQueryInfoA

\dm.dll

\dm.dll

!!"#$%&'())

!!"#$%&'())

ll%X`$Y\

ll%X`$Y\

%Cr#l$rQ2$d%$

%Cr#l$rQ2$d%$

.nu':

.nu':

M_%UHI=

M_%UHI=

;<.dj>

;<.dj>

Am%Xx

Am%Xx

D

D

dlSQL

dlSQL

M CmD$L

M CmD$L

((;|$ #(`

((;|$ #(`

uF.BH:

uF.BH:

t4u-4Z}>T

t4u-4Z}>T

wQ.Bq

wQ.Bq

.AC:%

.AC:%

J.rE\j

J.rE\j

%f; )c=

%f; )c=

dE.Nn

dE.Nn

TSSWPc.Th`

TSSWPc.Th`

.xL$d

.xL$d

7z.tu

7z.tu

&%9SD

&%9SD

.VA`D

.VA`D

jY.kl

jY.kl

o8%dV

o8%dV

VGz%FrE

VGz%FrE

uù u

uù u

.BNFq{

.BNFq{

-hO}]QV:

-hO}]QV:

456789:;

456789:;

!"#$%&'()* ,-./0123

!"#$%&'()* ,-./0123

deflate 1.2.3 C

deflate 1.2.3 C

en executed

en executed

p out of range,W %s

p out of range,W %s

I>support g

I>support g