TrojanPSW.Win32.Zbot_6985ebb0bd

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

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

FB_2.tmp.exe:3528
%original file name%.exe:3496
%original file name%.exe:3392
net.exe:676
net1.exe:936
cyzoy.exe:3576

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

ctfmon.exe:252
AcroRd32.exe:3520

File activity

The process FB_2.tmp.exe:3528 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\Muwas\cyzoy.exe (141 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\tmp4b826ef8.bat (183 bytes)

The process %original file name%.exe:3496 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\FB_1.tmp.pdf (22 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\FB_2.tmp.exe (141 bytes)

The process %original file name%.exe:3392 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 Data\InstallDir\help.exe (1425 bytes)

The process AcroRd32.exe:3520 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\Adobe\Acrobat\9.0\SharedDataEvents-journal (4790 bytes)
%Documents and Settings%\%current user%\Application Data\Adobe\Acrobat\9.0\AdobeCMapFnt09.lst (508 bytes)
%Documents and Settings%\%current user%\Application Data\Adobe\Acrobat\9.0\SharedDataEvents (54 bytes)
%Documents and Settings%\%current user%\Application Data\Adobe\Acrobat\9.0\UserCache.bin (1444 bytes)
%Documents and Settings%\%current user%\Local Settings\Application Data\Adobe\Acrobat\9.0\Cache\AcroFnt09.lst (7 bytes)

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

%Documents and Settings%\%current user%\Application Data\Adobe\Acrobat\9.0\SharedDataEvents-journal (0 bytes)

Registry activity

The process FB_2.tmp.exe:3528 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" = "54 A4 09 9D 65 C3 BF 3E 86 63 8F 2D 45 28 2C 0D"

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

[HKCU\Software\Microsoft\Inek]
"Zyegdo" = "76 23 2B 2E 1C 3A 7A 72 1F 18 24 CF 9B EA 79 68"

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

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

[HKCU\Software\Microsoft\Inek]
"Zyegdo" = "76 23 2B 2E 1C 3A 7A 72 1F 18 24 CF 9B EA 79 68"

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 %original file name%.exe:3496 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" = "C1 45 D9 59 D5 49 03 55 52 A9 F5 4E EB BA ED 81"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f3-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

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

[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\CurrentVersion\Explorer\MountPoints2\{773a730e-74fb-11e2-b597-000c293bdf2f}]
"BaseClass" = "Drive"

[HKLM\System\CurrentControlSet\Control\Session Manager]
"PendingFileRenameOperations" = "\??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\,"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f2-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Program Files%\Adobe\Reader 9.0\Reader]
"AcroRd32.exe" = "Adobe Reader 9.3"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f5-7454-11e2-b4cd-806d6172696f}]
"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\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"
"Personal" = "%Documents and Settings%\%current user%\My Documents"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp]
"FB_2.tmp.exe" = "FB_2.tmp"

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

"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 process %original file name%.exe:3392 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" = "E0 9A E3 3B A5 CA EF 02 8A 19 FA 5E 77 9F EB 7C"

[HKCR\S7.Application\CLSID]
"(Default)" = "{405CD8B9-3E65-4BB0-875D-A3B8247D6EE5}"

[HKCR\S7.Application]
"(Default)" = "S7.Application"

[HKCR\CLSID\{405CD8B9-3E65-4BB0-875D-A3B8247D6EE5}]
"(Default)" = "S7.Application"

[HKCR\CLSID\{405CD8B9-3E65-4BB0-875D-A3B8247D6EE5}\ProgID]
"(Default)" = "S7.Application"

[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"

[HKCR\CLSID\{405CD8B9-3E65-4BB0-875D-A3B8247D6EE5}\InprocHandler32]
"(Default)" = "ole32.dll"

[HKCR\CLSID\{405CD8B9-3E65-4BB0-875D-A3B8247D6EE5}\LocalServer32]
"(Default)" = "c:\6985EB~1.EXE"

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 Data\InstallDir\help.exe"

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

The process AcroRd32.exe:3520 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" = "28 6C 53 F5 3A DC 9A EF 4B 10 E0 03 68 3F 5C F4"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f3-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Inek]
"Zyegdo" = "76 23 2B 2E 1C 3A 7A 72 1F 18 24 CF 9B EA 79 68"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{773a730e-74fb-11e2-b597-000c293bdf2f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f2-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Adobe\Acrobat Reader\9.0\AVGeneral]
"bLastExitNormal" = "0"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f5-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

The Trojan-PSW deletes the following registry key(s):

[HKLM\SYSTEM\Acrobatviewercpp304]
[HKLM\SYSTEM\WSZXSGANXFJVAYSXYQGNXKQY]

The process net.exe:676 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" = "19 B0 E9 A4 27 1A 7C AF 1E 62 BB 97 91 47 8D A6"

The process net1.exe:936 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" = "A8 D5 48 6E 69 CB 80 63 A6 DB A0 89 1A A7 45 FE"

The process cyzoy.exe:3576 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" = "EC C0 07 CB 5C 10 73 AC 65 55 6D 63 D9 C2 03 3C"

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

Network activity (URLs)

URL	IP
hxxp://petrapollak.com/data/serverrs/config.bin	81.0.104.143

HOSTS file anomalies

No changes have been detected.

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):

   FB_2.tmp.exe:3528
   %original file name%.exe:3496
   %original file name%.exe:3392
   net.exe:676
   net1.exe:936
   cyzoy.exe:3576

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%\Application Data\Muwas\cyzoy.exe (141 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\tmp4b826ef8.bat (183 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\FB_1.tmp.pdf (22 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\FB_2.tmp.exe (141 bytes)
   %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 Data\InstallDir\help.exe (1425 bytes)
   %Documents and Settings%\%current user%\Application Data\Adobe\Acrobat\9.0\SharedDataEvents-journal (4790 bytes)
   %Documents and Settings%\%current user%\Application Data\Adobe\Acrobat\9.0\AdobeCMapFnt09.lst (508 bytes)
   %Documents and Settings%\%current user%\Application Data\Adobe\Acrobat\9.0\UserCache.bin (1444 bytes)
   %Documents and Settings%\%current user%\Local Settings\Application Data\Adobe\Acrobat\9.0\Cache\AcroFnt09.lst (7 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 Data\InstallDir\help.exe"
   
   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "help" = "%Documents and Settings%\%current user%\Application Data\InstallDir\help.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