TrojanPSW.Win32.Zbot_42a42de1eb

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Trojan-PSW creates the following process(es):

42a42de1eb265d2:1996
oxibw.exe:1176
tmp.exe:1624
.exe:604
wscript.exe:544

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

Explorer.EXE:1912

Mutexes

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

File activity

The process 42a42de1eb265d2:1996 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\mata2.bat (49 bytes)
%System%\drivers\etc\hosts (216 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\mata.bat (47 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\ .exe (35 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\rundll32-.txt (2321 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\invs.vbs (78 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\tmp.exe (141 bytes)

The Trojan-PSW deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\mata2.bat (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\mata.bat (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\rundll32-.txt (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\invs.vbs (0 bytes)

The process tmp.exe:1624 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\tmpc4e3eea2.bat (213 bytes)
%Documents and Settings%\%current user%\Application Data\Umicul\oxibw.exe (141 bytes)

Registry activity

The process 42a42de1eb265d2:1996 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A5 5B 87 02 49 E8 74 01 CF 10 68 F1 4C 6B 94 38"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Unsou]
"Zogod" = "2B A0 90 B1 25 C1 BB F7 A3 A9 41 9B BB 40 57 31"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Local Settings\Temp]
"tmp.exe" = "tmp"
"mata.bat" = "mata"

The Trojan-PSW adds the reference to itself to be executed when a user logs on:

[HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
"Shell" = "%Documents and Settings%\%current user%\Local Settings\Temp\file.exe"

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

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

The Trojan-PSW 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:

"UNCAsIntranet" = "1"

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

"IntranetName" = "1"

The process oxibw.exe:1176 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "BF C0 C6 D1 82 73 F4 E1 15 24 96 9B 94 58 E6 C1"

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

The process tmp.exe:1624 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "23 38 E2 2C 18 2E B2 76 53 4B 47 F1 2E EB 53 1F"

[HKCU\Software\Microsoft\Unsou]
"Zogod" = "2B A0 90 B1 25 C1 BB F7 A3 A9 41 9B BB 40 57 31"

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

The process .exe:604 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A6 FA 55 19 73 61 BB 91 9C F3 42 7B 0E 1C 61 0A"

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

The process wscript.exe:544 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "BD C3 4B 56 7A BB E0 F9 D5 31 B5 55 F6 5C 6D EE"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

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

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

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp]
"mata2.bat" = "mata2"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

The Trojan-PSW 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-PSW 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:

"UNCAsIntranet" = "1"

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

"ProxyBypass" = "1"

Dropped PE files

MD5	File path
fc702d107ef5e9e676c1864350f93ebb	c:\Documents and Settings\"%CurrentUserName%"\Application Data\Umicul\oxibw.exe
e0d21bee6dae44a7c6e1896d7a8c7463	c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Temp\ .exe

HOSTS file anomalies

The Trojan-PSW modifies "%System%\drivers\etc\hosts" file which is used to translate DNS entries to IP addresses. The modified file is 216 bytes in size. The following strings are added to the hosts file listed below:

127.0.0.1	www.website.com
127.0.0.1	www.website.com
127.0.0.1	www.website.com
127.0.0.1	www.website.com
127.0.0.1	www.website.com
127.0.0.1	www.website.com
127.0.0.1	www.website.com
127.0.0.1	www.website.com

Rootkit activity

The Trojan-PSW installs the following user-mode hooks in WININET.dll:

HttpSendRequestExA
HttpSendRequestW
InternetReadFileExA
InternetQueryDataAvailable
HttpSendRequestExW
InternetReadFile
HttpQueryInfoA
HttpSendRequestA
InternetCloseHandle

The Trojan-PSW installs the following user-mode hooks in CRYPT32.dll:

PFXImportCertStore

The Trojan-PSW installs the following user-mode hooks in USER32.dll:

SetCursorPos
DefMDIChildProcA
DefFrameProcA
DefDlgProcA
GetClipboardData
DefMDIChildProcW
DefFrameProcW
GetUpdateRgn
RegisterClassA
GetDCEx
ReleaseCapture
SetCapture
DefWindowProcA
CallWindowProcA
GetUpdateRect
PeekMessageA
CallWindowProcW
GetMessagePos
GetCursorPos
EndPaint
BeginPaint
DefWindowProcW
RegisterClassExA
GetMessageA
DefDlgProcW
SwitchDesktop
OpenInputDesktop
RegisterClassExW
RegisterClassW
GetCapture
PeekMessageW
GetMessageW
GetWindowDC
TranslateMessage
GetDC
ReleaseDC

The Trojan-PSW installs the following user-mode hooks in WS2_32.dll:

WSASend
send
closesocket

The Trojan-PSW installs the following user-mode hooks in kernel32.dll:

GetFileAttributesExW

The Trojan-PSW installs the following user-mode hooks in ntdll.dll:

LdrLoadDll
NtCreateThread

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. Scan a system with an anti-rootkit tool.
   
2. Terminate malicious process(es) (How to End a Process With the Task Manager):

   42a42de1eb265d2:1996
   oxibw.exe:1176
   tmp.exe:1624
   .exe:604
   wscript.exe:544
   

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

   %Documents and Settings%\%current user%\Local Settings\Temp\mata2.bat (49 bytes)
   %System%\drivers\etc\hosts (216 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\mata.bat (47 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\ .exe (35 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\rundll32-.txt (2321 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\invs.vbs (78 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\tmp.exe (141 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\tmpc4e3eea2.bat (213 bytes)
   %Documents and Settings%\%current user%\Application Data\Umicul\oxibw.exe (141 bytes)

5. Remove the references to the Trojan-PSW by modifying the following registry value(s) (How to Work with System Registry):

   [HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
   "Shell" = "%Documents and Settings%\%current user%\Local Settings\Temp\file.exe"

6. Restore the original content of the HOSTS file (%System%\drivers\etc\hosts): 127.0.0.1 localhost
   
7. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
   
8. Reboot the computer.
   

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

Static Analysis

VersionInfo

Company Name: sita
Product Name: sita
Product Version: 1.0.0.0
Legal Copyright: sfwe543wt4
Legal Trademarks: sita
Original Filename: force.exe
Internal Name: force.exe
File Version: 1.0
File Description: uk
Comments: uk
Language: Language Neutral

Company Name: sitaProduct Name: sitaProduct Version: 1.0.0.0Legal Copyright: sfwe543wt4Legal Trademarks: sitaOriginal Filename: force.exeInternal Name: force.exeFile Version: 1.0 File Description: ukComments: ukLanguage: Language Neutral

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.rsrc	8192	5268	5632	2.96853	969b265a6a76b48d06736a68aebbed71
.text	16384	409988	410112	5.27587	23f61c8ad1fc28f77b35c5e4f6594e7a
.reloc	434176	12	512	0.084755	83382413df669a89f593d96efa0fd639

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
hxxp://portosegurosmartphones.com.br/eco/vat/config.bin	186.202.127.48

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

GET /eco/vat/config.bin HTTP/1.1

Accept: */*

Connection: Close

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)

Host: portosegurosmartphones.com.br

Cache-Control: no-cache

HTTP/1.1 404 Not Found

Date: Fri, 20 Jun 2014 11:30:19 GMT

Server: Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.1e-fips mod_bwlimited/1.4

Content-Length: 481

Connection: close

Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">.<html><head>.<title>404 Not Found</title>.</head><body>.<h1>Not Found</h1>.<p>The requested URL /eco/vat/config.bin was not found on this server.</p>.<p>Additionally, a 404 Not Found.error was encountered while trying to use an ErrorDocument to handle the request.</p>.<hr>.<address>Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.1e-fips mod_bwlimited/1.4 Server at portosegurosmartphones.com.br Port 80</address>.</body></html>...

GET /eco/vat/config.bin HTTP/1.1

Accept: */*

Connection: Close

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)

Host: portosegurosmartphones.com.br

Cache-Control: no-cache

HTTP/1.1 404 Not Found

Date: Fri, 20 Jun 2014 11:30:26 GMT

Server: Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.1e-fips mod_bwlimited/1.4

Content-Length: 481

Connection: close

Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">.<html><head>.<title>404 Not Found</title>.</head><body>.<h1>Not Found</h1>.<p>The requested URL /eco/vat/config.bin was not found on this server.</p>.<p>Additionally, a 404 Not Found.error was encountered while trying to use an ErrorDocument to handle the request.</p>.<hr>.<address>Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.1e-fips mod_bwlimited/1.4 Server at portosegurosmartphones.com.br Port 80</address>.</body></html>...

GET /eco/vat/config.bin HTTP/1.1

Accept: */*

Connection: Close

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)

Host: portosegurosmartphones.com.br

Cache-Control: no-cache

HTTP/1.1 404 Not Found

Date: Fri, 20 Jun 2014 11:30:25 GMT

Server: Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.1e-fips mod_bwlimited/1.4

Content-Length: 481

Connection: close

Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">.<html><head>.<title>404 Not Found</title>.</head><body>.<h1>Not Found</h1>.<p>The requested URL /eco/vat/config.bin was not found on this server.</p>.<p>Additionally, a 404 Not Found.error was encountered while trying to use an ErrorDocument to handle the request.</p>.<hr>.<address>Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.1e-fips mod_bwlimited/1.4 Server at portosegurosmartphones.com.br Port 80</address>.</body></html>...

GET /eco/vat/config.bin HTTP/1.1

Accept: */*

Connection: Close

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)

Host: portosegurosmartphones.com.br

Cache-Control: no-cache

HTTP/1.1 404 Not Found

Date: Fri, 20 Jun 2014 11:30:19 GMT

Server: Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.1e-fips mod_bwlimited/1.4

Content-Length: 481

Connection: close

Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">.<html><head>.<title>404 Not Found</title>.</head><body>.<h1>Not Found</h1>.<p>The requested URL /eco/vat/config.bin was not found on this server.</p>.<p>Additionally, a 404 Not Found.error was encountered while trying to use an ErrorDocument to handle the request.</p>.<hr>.<address>Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.1e-fips mod_bwlimited/1.4 Server at portosegurosmartphones.com.br Port 80</address>.</body></html>...

Map

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

Strings from Dumps

Explorer.EXE_1912_rwx_01E00000_00027000:

.text

.text

`.data

`.data

.reloc

.reloc

http://www.google.com/webhp

http://www.google.com/webhp

PR_OpenTCPSocket

PR_OpenTCPSocket

gdiplus.dll

gdiplus.dll

GdiplusShutdown

GdiplusShutdown

ole32.dll

ole32.dll

gdi32.dll

gdi32.dll

: ;2*8.>

: ;2*8.>

3.#70!2)

3.#70!2)

x#m`a`cmddt-

x#m`a`cmddt-

6 !26!1'1

6 !26!1'1

7"52),,>

7"52),,>

;<)?$*%,

;<)?$*%,

71.(5;4=

71.(5;4=

(203,2$0

(203,2$0

/?./,5 <</pre><pre>:>(<<44=3%</pre><pre>8%/<8/?)?/</pre><pre>%/><!8?>!</!8?></pre><pre>HTTP/1.1</pre><pre>userenv.dll</pre><pre>del "%s"</pre><pre>if exist "%s" goto d</pre><pre>del /F "%s"</pre><pre>Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1)</pre><pre>urlmon.dll</pre><pre>cabinet.dll</pre><pre>http://</pre><pre>https://</pre><pre>HTTP/1.</pre><pre>SSSh,4</pre><pre>GetProcessHeap</pre><pre>KERNEL32.dll</pre><pre>SetKeyboardState</pre><pre>ExitWindowsEx</pre><pre>MsgWaitForMultipleObjects</pre><pre>MapVirtualKeyW</pre><pre>GetKeyboardState</pre><pre>OpenWindowStationW</pre><pre>GetProcessWindowStation</pre><pre>CreateWindowStationW</pre><pre>CloseWindowStation</pre><pre>SetProcessWindowStation</pre><pre>USER32.dll</pre><pre>RegOpenKeyExW</pre><pre>RegEnumKeyExW</pre><pre>RegCloseKey</pre><pre>RegCreateKeyExW</pre><pre>ADVAPI32.dll</pre><pre>PathIsURLW</pre><pre>UrlUnescapeA</pre><pre>SHDeleteKeyW</pre><pre>SHLWAPI.dll</pre><pre>ShellExecuteW</pre><pre>SHELL32.dll</pre><pre>Secur32.dll</pre><pre>SetViewportOrgEx</pre><pre>GDI32.dll</pre><pre>WS2_32.dll</pre><pre>PFXImportCertStore</pre><pre>CertDeleteCertificateFromStore</pre><pre>CertOpenSystemStoreW</pre><pre>CertCloseStore</pre><pre>CertEnumCertificatesInStore</pre><pre>CertDuplicateCertificateContext</pre><pre>PFXExportCertStoreEx</pre><pre>CRYPT32.dll</pre><pre>HttpSendRequestExA</pre><pre>HttpQueryInfoA</pre><pre>HttpSendRequestExW</pre><pre>HttpSendRequestW</pre><pre>HttpSendRequestA</pre><pre>InternetCrackUrlA</pre><pre>HttpOpenRequestA</pre><pre>HttpAddRequestHeadersA</pre><pre>GetUrlCacheEntryInfoW</pre><pre>HttpAddRequestHeadersW</pre><pre>WININET.dll</pre><pre>OLEAUT32.dll</pre><pre>NETAPI32.dll</pre><pre>6 6&6/656{6</pre><pre>cGlobal\XXX</pre><pre>nspr4.dll</pre><pre>nss3.dll</pre><pre>SysShadow</pre><pre>kernel32.dll</pre><pre>"%s" %s</pre><pre>/c "%s"</pre><pre>%sx.%s</pre><pre>%sx</pre><pre>%Documents and Settings%\%current user%\Application Data\Wiadu\ewafa.olr</pre><pre>%Documents and Settings%\%current user%\Application Data\Wiadu</pre><pre>ewafa.olr</pre><pre>Global\{5C07913D-11FD-3707-2342-59FCAC77347D}</pre><pre>%Documents and Settings%\%current user%\Application Data</pre><pre>{CA7C2318-A3D8-A17C-2342-59FCAC77347D}</pre>