Backdoor.Win32.Caphaw_QKKBAL_c2a4344506

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

tmp589c9bb6.exe:1008
%original file name%.exe:1960
ykubn.exe:196
ykubn.exe:212

The Backdoor injects its code into the following process(es):No processes have been created.

File activity

The process tmp589c9bb6.exe:1008 makes changes in the file system.

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

%Documents and Settings%\%current user%\Application Data\Lakao\ykubn.exe (259 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\tmp520737e7.bat (189 bytes)

The Backdoor deletes the following file(s):

%Documents and Settings%\%current user%\Application Data\Lakao\ykubn.exe (0 bytes)
%Documents and Settings%\%current user%\Application Data\Lakao (0 bytes)

The process %original file name%.exe:1960 makes changes in the file system.

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

%Documents and Settings%\%current user%\Application Data\Lakao\ykubn.exe (283 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\tmp8eafc4db.bat (177 bytes)

Registry activity

The process tmp589c9bb6.exe:1008 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "99 6B 77 8A 7E 33 3E FA D6 00 ED B1 C3 DA 0B 95"

[HKCU\Software\Microsoft\Pula]
"Myysto" = "95 C2 3A 68 66 FD B6 AA 87 04 0A 14 75 1C B6 00"

"Umzaowg" = "35 D6 08 60 0B 98 E5 1F 17 9B A3 79 40 E6 B7 DC"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"WarnonBadCertRecving" = "0"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"EnableSPDY3_0" = "0"

The Backdoor 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 Backdoor modifies IE settings for security zones to map all urls to the Intranet Zone:

"IntranetName" = "1"

The Backdoor 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 Backdoor deletes the following value(s) in system registry:

The Backdoor disables automatic startup of the application by deleting the following autorun value:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"{9E3E114F-ABBF-D144-5A4A-418346001DD6}"

The process %original file name%.exe:1960 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5A D3 D9 2D 41 86 64 E2 39 C6 F1 D9 84 88 2C 23"

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

The process ykubn.exe:196 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "30 2C D8 82 0D BE C8 44 28 B6 74 DF F9 40 E7 EE"

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

The process ykubn.exe:212 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "0F EA 30 5E 2D 18 E9 E7 B8 9B 25 55 EA FC 7D 33"

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

Network activity (URLs)

URL	IP
hxxp://a26.d.akamai.net/msdownload/update/v3/static/trustedr/en/authrootseq.txt
hxxp://a26.d.akamai.net/msdownload/update/v3/static/trustedr/en/authrootstl.cab
hxxp://www.google.com/webhp	74.125.226.241
hxxp://www.google.ca/webhp?gfe_rd=cr&ei=6doyU-3hMY_O8ge0y4DABA	74.125.226.248
www.download.windowsupdate.com	23.62.239.11
seooptimisaion2traffic.com	184.64.59.68

HOSTS file anomalies

No changes have been detected.

Rootkit activity

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

HttpSendRequestExA
HttpSendRequestW
InternetReadFileExA
InternetWriteFile
InternetWriteFileExA
InternetQueryDataAvailable
HttpOpenRequestW
InternetConnectW
HttpSendRequestExW
InternetReadFile
HttpQueryInfoA
HttpSendRequestA
InternetCloseHandle
InternetConnectA
HttpOpenRequestA

The Backdoor installs the following user-mode hooks in CRYPT32.dll:

PFXImportCertStore

The Backdoor installs the following user-mode hooks in USER32.dll:

GetClipboardData
TranslateMessage

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

WSASend
WSARecv
send
closesocket

The Backdoor installs the following user-mode hooks in kernel32.dll:

GetFileAttributesExW

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

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):

   tmp589c9bb6.exe:1008
   %original file name%.exe:1960
   ykubn.exe:196
   ykubn.exe:212

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

   %Documents and Settings%\%current user%\Application Data\Lakao\ykubn.exe (259 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\tmp520737e7.bat (189 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\tmp8eafc4db.bat (177 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