Backdoor.Win32.PcClient_e86e44e6c7

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

3f475710.exe:768
%original file name%.exe:336
rundll32.exe:1576
1509445b.exe:1260

The Backdoor injects its code into the following process(es):

spoolsv.exe:1424
rundll32.exe:1700

File activity

The process 3f475710.exe:768 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\1.tmp (673 bytes)

The Backdoor deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\2.tmp (0 bytes)

The process %original file name%.exe:336 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\d8e7b49f.exe (1436 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\1c0386cf.exe (1673 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\3f475710.exe (16124 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\1509445b.exe (8671 bytes)

The process spoolsv.exe:1424 makes changes in the file system.

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

%WinDir%\Temp\3.tmp (39 bytes)

The Backdoor deletes the following file(s):

%WinDir%\Temp\3.tmp (0 bytes)
%System%\drivers\etc\hosts (0 bytes)

The process 1509445b.exe:1260 makes changes in the file system.

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

%WinDir%\sqrpcs.dll (118 bytes)

Registry activity

The process 3f475710.exe:768 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "B1 90 4C 41 D4 7E 94 4E 54 29 7D 2E 2E F4 D1 58"

[HKLM\System\CurrentControlSet\Control\Session Manager]
"PendingFileRenameOperations" = "\??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\4.tmp,"

The process spoolsv.exe:1424 makes changes in the system registry.

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

[HKLM\System\CurrentControlSet\Services\27989140]
"imagepath" = "\??\%WinDir%\TEMP\3.tmp"

[HKLM\System\CurrentControlSet\Control\Print\Providers\367567872]
"Name" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\2.tmp"

[HKLM\System\CurrentControlSet\Control\Print\Providers]
"Order" = "LanMan Print Services, Internet Print Provider, 367567872"

[HKLM\System\CurrentControlSet\Services\27989140]
"type" = "1"

The Backdoor deletes the following registry key(s):

[HKLM\System\CurrentControlSet\Services\27989140]
[HKLM\System\CurrentControlSet\Services\27989140\Enum]
[HKLM\System\CurrentControlSet\Control\Print\Providers\367567872]

The process rundll32.exe:1700 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "60 2D E3 7C 59 57 5C 0A 8B DF ED 9F 67 48 B6 39"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Wtube]
"Eqegaqojoqoka" = "186"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Ihoragiqinicim" = "rundll32.exe %WinDir%\sqrpcs.dll,Startup"

The process rundll32.exe:1576 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "7A 0C 87 FF CF 25 8F 7A A0 37 43 0A 2E 2A 06 4D"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Wtube]
"Bveqayeweci" = "43 01 38 03 58 05 51 07 41 09 44 0B 48 0D 41 0F"

The process 1509445b.exe:1260 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "97 65 C7 47 18 7F 85 22 7F EE 77 BD 8D 53 B3 24"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Wtube]
"Bveqayeweci" = "43 01 38 03 58 05 51 07 41 09 44 0B 48 0D 41 0F"
"Ydapup" = "45 01 36 03 3C 05 37 07 3E 09 39 0B 4E 0D 3B 0F"

Network activity (URLs)

URL	IP
081207de011e.linkbuzz.net	Unresolvable

HOSTS file anomalies

No changes have been detected.

Rootkit activity

Using the driver "UNKNOWN" the Backdoor controls loading executable images into a memory by installing the Load image notifier.

The Backdoor intercepts DriverStartIO in a miniport driver of a hard drive controller (ATAPI) to handle request to its own files:

StartIo

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):

   3f475710.exe:768
   %original file name%.exe:336
   rundll32.exe:1576
   1509445b.exe:1260

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

   %Documents and Settings%\%current user%\Local Settings\Temp\1.tmp (673 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\d8e7b49f.exe (1436 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\1c0386cf.exe (1673 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\3f475710.exe (16124 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\1509445b.exe (8671 bytes)
   %WinDir%\Temp\3.tmp (39 bytes)
   %WinDir%\sqrpcs.dll (118 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Ihoragiqinicim" = "rundll32.exe %WinDir%\sqrpcs.dll,Startup"

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