Trojan.NSIS.StartPage_dec72e9d85

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Trojan creates the following process(es):

dec72e9d853862fcaaac63c38b4f900e.exe:1316
dec72e9d853862fcaaac63c38b4f900e.exe:1260
dec72e9d853862fcaaac63c38b4f900e.exe:340

File activity

The process dec72e9d853862fcaaac63c38b4f900e.exe:1316 makes changes in a file system.

The Trojan deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\Watotip.yax (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Luxobapef.dll (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\dexuxurayo.dll (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\vumuwireqa.dll (0 bytes)

The process dec72e9d853862fcaaac63c38b4f900e.exe:1260 makes changes in a file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\Watotip.yax (6837 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\nsp2.tmp\System.dll (11 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Luxobapef.dll (3 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\dexuxurayo.dll (3 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\vumuwireqa.dll (11 bytes)

The Trojan deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\nsp2.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\nsz1.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\nsp2.tmp\System.dll (0 bytes)

The process dec72e9d853862fcaaac63c38b4f900e.exe:340 makes changes in a file system.

The Trojan deletes the following file(s):

%Program Files%\Common Files\Identity0\00134df4.txt (0 bytes)

Registry activity

The process dec72e9d853862fcaaac63c38b4f900e.exe:1260 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "90 8A F6 E6 96 96 82 5D 37 AA 90 9A A0 D1 63 30"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[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\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

The process dec72e9d853862fcaaac63c38b4f900e.exe:340 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "3A 49 6C B9 B5 34 4B DE BA 0F 35 ED 27 60 19 B7"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\xkrtxopie.exe]
"DisableExceptionChainValidation" = ""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Startup" = "%Documents and Settings%\%current user%\Start Menu\Programs\Startup"

[HKCU\Software\Classes\CLSID\{BA06EFD6-B780-DF48-BB10-0037BE83C526}\12940313\CG1]
"BID" = "20 00 08 00 10 00 0A 00 DD 07 00 00 14 00 88 FF"

[HKCU\Software\Win7zip]
"Uuid" = "BA 06 EF D6 B7 80 DF 48 BB 10 00 37 BE 83 C5 26"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

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

[HKCU\Software\Classes\CLSID\{BA06EFD6-B780-DF48-BB10-0037BE83C526}\12940313\CG1]
"HAL" = "05 EE 00 00"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"nvsystray" = "%Program Files%\Common Files\Identity0\xkrtxopie.exe"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"nvsystray" = "%Program Files%\Common Files\Identity0\xkrtxopie.exe"

Network activity (URLs)

No activity has been detected.

Rootkit activity

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

DnsQuery_W

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

getaddrinfo
GetAddrInfoW

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

KiFastSystemCall

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):

   dec72e9d853862fcaaac63c38b4f900e.exe:1316
   dec72e9d853862fcaaac63c38b4f900e.exe:1260
   dec72e9d853862fcaaac63c38b4f900e.exe:340

3. Delete the original Trojan file.
   
4. Delete or disinfect the following files created/modified by the Trojan:

   %Documents and Settings%\%current user%\Local Settings\Temp\Watotip.yax (6837 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\nsp2.tmp\System.dll (11 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\Luxobapef.dll (3 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\dexuxurayo.dll (3 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\vumuwireqa.dll (11 bytes)

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

   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "nvsystray" = "%Program Files%\Common Files\Identity0\xkrtxopie.exe"
   
   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "nvsystray" = "%Program Files%\Common Files\Identity0\xkrtxopie.exe"

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