TrojanPSW.Win32.Zbot_dfe8ce0ded

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

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

wscript.exe:1072
meuh.exe:640
%original file name%.exe:2024
tmp.exe:1092
.exe:1552

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

Explorer.EXE:128

Mutexes

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

File activity

The process %original file name%.exe:2024 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:1092 makes changes in the file system.

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

%Documents and Settings%\%current user%\Application Data\Pata\meuh.exe (141 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\tmpc256b333.bat (213 bytes)

Registry activity

The process wscript.exe:1072 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" = "91 68 4E 68 D4 95 A7 C7 18 75 78 15 56 8A B4 BE"

[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"

The process meuh.exe:640 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" = "D3 4E F1 0D D6 D2 2F D8 45 DC E2 4A D8 7A 5C 98"

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

The process %original file name%.exe:2024 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" = "CA 43 04 33 07 38 21 4F 9D 88 7C 60 D6 78 E2 C6"

[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\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"

[HKCU\Software\Microsoft\Cyizc]
"Ohsylenoy" = "8C 8E 90 08 DA 3D E0 0A F9 D7 CE 53 F4 2E 15 1B"

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 tmp.exe:1092 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" = "A2 C6 C4 B5 60 9F F3 43 71 6B 79 B7 55 3D DC 46"

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

[HKCU\Software\Microsoft\Cyizc]
"Ohsylenoy" = "8C 8E 90 08 DA 3D E0 0A F9 D7 CE 53 F4 2E 15 1B"

The process .exe:1552 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" = "48 53 55 58 27 66 5C 48 C8 6B 90 C8 FB F2 ED F6"

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

Dropped PE files

MD5	File path
c7f970cf548de741ec1683a2a6fa8598	c:\Documents and Settings\"%CurrentUserName%"\Application Data\Pata\meuh.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):

   wscript.exe:1072
   meuh.exe:640
   %original file name%.exe:2024
   tmp.exe:1092
   .exe:1552
   

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%\Application Data\Pata\meuh.exe (141 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\tmpc256b333.bat (213 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. Reboot the computer.
   

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

Static Analysis

VersionInfo

Company Name: SOMITOMO
Product Name: SOMITOMO
Product Version: 1.0.0.0
Legal Copyright: 62556872
Legal Trademarks: SOMITOMO
Original Filename: force.exe
Internal Name: force.exe
File Version: 1.0
File Description: QUOTATION
Comments: Þscription%
Language: English (United States)

Company Name: SOMITOMOProduct Name: SOMITOMOProduct Version: 1.0.0.0Legal Copyright: 62556872Legal Trademarks: SOMITOMOOriginal Filename: force.exeInternal Name: force.exeFile Version: 1.0 File Description: QUOTATIONComments: Þscription%Language: English (United States)

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.rsrc	8192	5320	5632	3.00417	cdb661fb47a402e374ee6c61d0a90768
.text	16384	422340	422400	5.259	3f376ca5691e4237140e77a2803a3743
.reloc	442368	12	512	0.084755	55587a6f81a92dbd5710f274439a50c1

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Map

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

Strings from Dumps

Explorer.EXE_128_rwx_00E70000_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\Viuzhy\ikyw.syv</pre><pre>%Documents and Settings%\%current user%\Application Data\Viuzhy</pre><pre>ikyw.syv</pre><pre>Global\{F2C42F54-4C8C-B685-7B1B-E213C3831807}</pre><pre>%Documents and Settings%\%current user%\Application Data</pre><pre>{64BF9D71-FEA9-20FE-7B1B-E213C3831807}</pre>