TrojanPSW.Win32.Zbot_4466ed8ca3

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

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

net.exe:2788
net.exe:2916
net1.exe:2820
net1.exe:2948
4466ed8ca341843373f2c60d13456053.exe:2528
duhe.exe:3004
duhe.exe:2888

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

ctfmon.exe:252

File activity

The process 4466ed8ca341843373f2c60d13456053.exe:2528 makes changes in a file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\tmpd5cb3f20.bat (177 bytes)
%Documents and Settings%\%current user%\Application Data\Oqit\duhe.exe (1679 bytes)

Registry activity

The process net.exe:2788 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "E1 F9 2F C4 95 0B 58 48 5A 33 A8 AB B1 DE 44 FC"

The process net.exe:2916 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "E5 75 F9 D6 82 E1 25 7B 7B AD BB 00 8A 28 D1 01"

The process net1.exe:2820 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "90 68 95 D8 2C 81 86 DE 33 11 08 BA C8 E2 C8 4A"

The process net1.exe:2948 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8D 2A 64 EC D5 DD E9 C7 8E 7B 6F 09 36 BA AB 2E"

The process 4466ed8ca341843373f2c60d13456053.exe:2528 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "3A 95 74 80 FC 7D 32 B3 F0 34 14 88 E4 4C 6A 97"

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

The process ctfmon.exe:252 makes changes in a system registry.

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

[HKCU\Software\Microsoft\Ytunop]
"Otepulyg" = "90 18 06 66 93 98 97 4F C4 72 5A B3 FC 78 DC 44"

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

The Trojan-PSW disables automatic startup of the application by deleting the following autorun value:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"internat.exe"

The process duhe.exe:3004 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8C DA 43 50 77 5B 0C F0 E8 28 A8 92 58 71 42 73"

[HKCU\Software\Microsoft\Ytunop]
"Otepulyg" = "90 18 06 66 93 98 97 4F C4 72 5A B3 FC 78 DC 44"

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

The process duhe.exe:2888 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "57 70 D6 7A 55 B6 7B B2 4C 1A 00 C1 C0 44 58 81"

Network activity (URLs)

URL	IP
hxxp://www.google.com/webhp	173.194.43.80
hxxp://www.google.ca/webhp?gws_rd=cr&ei=kVQ4Up6qLaSEygH0qoGgCg	173.194.43.127
hxxp://e6845.ce.akamaiedge.net/crls/secureca.crl
hxxp://e6845.ce.akamaiedge.net/crls/gtglobal.crl
hxxp://www3.l.google.com/GIAG2.crl
crl.geotrust.com	23.4.53.163
pki.google.com	173.194.43.96

Rootkit activity

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

HttpSendRequestExW
HttpSendRequestExA
InternetReadFileExA
HttpSendRequestA
HttpSendRequestW
InternetQueryDataAvailable
InternetCloseHandle
HttpQueryInfoA
InternetReadFile

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):

   net.exe:2788
   net.exe:2916
   net1.exe:2820
   net1.exe:2948
   4466ed8ca341843373f2c60d13456053.exe:2528
   duhe.exe:3004
   duhe.exe:2888

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\tmpd5cb3f20.bat (177 bytes)
   %Documents and Settings%\%current user%\Application Data\Oqit\duhe.exe (1679 bytes)

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

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

Static Analysis

Network Activity

Map

Strings from Dumps