TrojanPSW.Win32.Zbot.4_24e758c814

Dynamic Analysis

Process activity

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

vaosy.exe:2996
24e758c8141ca769c1fe816567c6299c.exe:2580

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

ctfmon.exe:252

File activity

The process vaosy.exe:2996 makes changes in a file system.

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

%Documents and Settings%\%current user%\ntuser.dat.LOG (2208 bytes)
%Documents and Settings%\%current user%\NTUSER.DAT (540 bytes)

The process 24e758c8141ca769c1fe816567c6299c.exe:2580 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\OHO34B4.bat (173 bytes)
%Documents and Settings%\%current user%\Application Data\Ilukq\vaosy.exe (1743 bytes)

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

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

%Documents and Settings%\%current user%\ntuser.dat.LOG (5400 bytes)
%Documents and Settings%\%current user%\NTUSER.DAT (4484 bytes)

Registry activity

The process vaosy.exe:2996 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" = "EA 8F 2D CC 06 59 4F 05 CE 95 3B E0 63 74 12 B6"

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

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

[HKCU\Software\Microsoft\Nuuvythan]
"190di40b" = "gNzdJ7n/100IQw=="

The process 24e758c8141ca769c1fe816567c6299c.exe:2580 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" = "89 8A 39 04 F0 19 41 84 16 BD 63 08 44 67 B8 CB"

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

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "93 06 78 B9 81 E5 41 BA 7A B4 1A 02 94 3C 83 CD"

[HKCU\Identities]
"Last User ID" = "{6855BFC2-9E4A-4896-A11D-74388FBABDC2}"

[HKCU\Identities]
"Last Username" = "Main Identity"

[HKCU\Software\Microsoft\WAB\WAB4]
"OlkFolderRefresh" = "0"

[HKCU\Software\Microsoft\WAB\WAB4]
"FirstRun" = "1"

[HKCU\Identities]
"Identity Login" = "622675"

[HKCU\Software\Microsoft\Internet Account Manager]
"Server ID" = "4"

[HKCU\Identities]
"Identity Ordinal" = "2"

[HKCU\Software\Microsoft\WAB\WAB4]
"OlkContactRefresh" = "0"

[HKCU\Software\Microsoft\Nuuvythan]
"1ccb93f9" = "tdyyJw=="

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

[HKCU\Identities]
"Changing"

[HKCU\Identities]
"OutgoingID"

[HKCU\Identities]
"IncomingID"

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

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

Network activity (URLs)

No activity has been detected.

Rootkit activity

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

HttpSendRequestExW
HttpSendRequestExA
InternetWriteFile
InternetReadFileExA
InternetReadFileExW
HttpSendRequestA
HttpSendRequestW
InternetQueryDataAvailable
HttpQueryInfoW
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:

GetClipboardData
TranslateMessage

The Trojan-PSW installs the following user-mode hooks in Secur32.dll:

UnsealMessage
SealMessage
DeleteSecurityContext

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

WSAGetOverlappedResult
WSASend
recv
gethostbyname
WSARecv
send
closesocket
freeaddrinfo
getaddrinfo
GetAddrInfoW

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):

   vaosy.exe:2996
   24e758c8141ca769c1fe816567c6299c.exe:2580
   

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%\ntuser.dat.LOG (2208 bytes)
   %Documents and Settings%\%current user%\NTUSER.DAT (540 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\OHO34B4.bat (173 bytes)
   %Documents and Settings%\%current user%\Application Data\Ilukq\vaosy.exe (1743 bytes)
   

5. 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