TrojanPSW.Win32.Zbot_c9d5fdff35

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

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

amum.exe:1244
amum.exe:456
net1.exe:620
net1.exe:240
net.exe:168
net.exe:1836
iexplore.exe:1872
iexplore.exe:1820
%original file name%.exe:1032
%original file name%.exe:1292

File activity

The process amum.exe:1244 makes changes in the file system.

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

%Documents and Settings%\%current user%\Start Menu\Programs\Startup\system.pif (1425 bytes)
%Documents and Settings%\All Users\Start Menu\Programs\Startup\system.pif (1425 bytes)
%Documents and Settings%\%current user%\Application Datafirefox.exe (1425 bytes)

The process %original file name%.exe:1032 makes changes in the file system.

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

%Documents and Settings%\%current user%\Start Menu\Programs\Startup\system.pif (1425 bytes)
%Documents and Settings%\All Users\Start Menu\Programs\Startup\system.pif (1425 bytes)
%Documents and Settings%\%current user%\Application Datafirefox.exe (1425 bytes)

The process %original file name%.exe:1292 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\tmp3ea924cc.bat (177 bytes)
%Documents and Settings%\%current user%\Application Data\Ifohev\amum.exe (315 bytes)

Registry activity

The process amum.exe:1244 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" = "49 53 32 25 8F D6 13 EB 4A 16 F9 14 71 94 D1 B5"

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

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

To automatically run itself each time Windows is booted, the Trojan-PSW adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"help" = "%Documents and Settings%\%current user%\Application Datafirefox.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"help" = "%Documents and Settings%\%current user%\Application Datafirefox.exe"

The process amum.exe:456 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" = "F9 7F 85 E2 51 58 9B 0C 23 AC 21 8B 1D 7D 5C DF"

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

The process net1.exe:620 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 2E 21 3D 34 A5 9F 7B 13 1C 60 93 8A AB B1 91"

The process net1.exe:240 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" = "09 C6 BA CD FD B0 C0 8A 27 86 AF 04 49 41 1F 17"

The process net.exe:168 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" = "B6 7A 9C AC 02 0C B4 8C FF 29 62 EE 7D 5C 03 61"

The process net.exe:1836 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" = "1C 2F B5 B3 9D CB 5C 12 DD DA 00 5D 83 21 BD 2E"

The process iexplore.exe:1872 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" = "0F 04 E6 86 F9 7E 41 84 0A 9D 0F A6 E3 F0 DD 80"

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

The process iexplore.exe:1820 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" = "9C 93 57 31 68 2D C5 87 96 09 4D 85 13 66 EA AA"

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

The process %original file name%.exe:1032 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" = "61 93 FF 25 C6 C5 67 C0 A9 FB F4 25 9A CC 87 69"

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

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

To automatically run itself each time Windows is booted, the Trojan-PSW adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"help" = "%Documents and Settings%\%current user%\Application Datafirefox.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"help" = "%Documents and Settings%\%current user%\Application Datafirefox.exe"

The process %original file name%.exe:1292 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" = "C5 22 FD 7B F7 19 BF A2 7A 1E 34 19 1E 63 7A A8"

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

Network activity (URLs)

URL	IP
hxxp://176.31.95.143/bo3/config.bin
hxxp://176.31.95.143/

HOSTS file anomalies

No changes have been detected.

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):

   amum.exe:1244
   amum.exe:456
   net1.exe:620
   net1.exe:240
   net.exe:168
   net.exe:1836
   iexplore.exe:1872
   iexplore.exe:1820
   %original file name%.exe:1032
   %original file name%.exe:1292

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%\Start Menu\Programs\Startup\system.pif (1425 bytes)
   %Documents and Settings%\All Users\Start Menu\Programs\Startup\system.pif (1425 bytes)
   %Documents and Settings%\%current user%\Application Datafirefox.exe (1425 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\tmp3ea924cc.bat (177 bytes)
   %Documents and Settings%\%current user%\Application Data\Ifohev\amum.exe (315 bytes)

5. Delete the following value(s) in the autorun key (How to Work with System Registry):

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "help" = "%Documents and Settings%\%current user%\Application Datafirefox.exe"
   
   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "help" = "%Documents and Settings%\%current user%\Application Datafirefox.exe"
   
   

6. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
   
7. 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