DDoSNitol_99fc0a8154

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Trojan creates the following process(es):

regsvr32.exe:2604
hrl1.tmp:2760

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

zqxxme.exe:2904

File activity

The process regsvr32.exe:2604 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\hrl1.tmp (1647 bytes)

The process zqxxme.exe:2904 makes changes in the file system.

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

C:\RCX2.tmp (17180 bytes)
%Documents and Settings%\%current user%\Local Settings\Application Data\Adobe\Reader 9.3\Setup Files\lpk.dll (2105 bytes)
%Documents and Settings%\%current user%\Local Settings\Application Data\Adobe\Reader 9.3\Setup Files\Reader9\lpk.dll (2105 bytes)
%Documents and Settings%\All Users\Application Data\Adobe\Reader\9.3\ARM\lpk.dll (2105 bytes)
%System%\hra33.dll (7 bytes)
%Documents and Settings%\All Users\Application Data\Adobe\Reader\9.3\ARM\18298\lpk.dll (2105 bytes)

The Trojan deletes the following file(s):

%System%\hra33.dll (0 bytes)

The process hrl1.tmp:2760 makes changes in the file system.

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

%System%\zqxxme.exe (2105 bytes)

Registry activity

The process regsvr32.exe:2604 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "19 67 5A 59 56 41 EF F6 79 74 9B 62 BB D0 CF C4"

The process zqxxme.exe:2904 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "FE 1B CD 44 80 4D B0 F3 89 29 74 3A 2B 17 B9 24"

The process hrl1.tmp:2760 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "18 BF 90 46 B3 DD 0B 87 EC CB D2 FC 6E 5B E7 C0"

[HKLM\System\CurrentControlSet\Services\Distribuoyo]
"Description" = "Distribuajk Transaction Coordinator Service."

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

Network activity (URLs)

URL	IP
fei9988.3322.org	221.130.179.36

HOSTS file anomalies

The Trojan modifies "%System%\drivers\etc\hosts" file which is used to translate DNS entries to IP addresses. The modified file is 734 bytes in size. The following strings are added to the hosts file listed below:

127.0.0.1	www.Brenz.pl

Rootkit activity

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

NtQueryInformationProcess
ZwOpenFile
ZwDeviceIoControlFile
NtCreateProcessEx
NtCreateProcess
ZwCreateFile

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):

   regsvr32.exe:2604
   hrl1.tmp:2760

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\hrl1.tmp (1647 bytes)
   C:\RCX2.tmp (17180 bytes)
   %Documents and Settings%\%current user%\Local Settings\Application Data\Adobe\Reader 9.3\Setup Files\lpk.dll (2105 bytes)
   %Documents and Settings%\%current user%\Local Settings\Application Data\Adobe\Reader 9.3\Setup Files\Reader9\lpk.dll (2105 bytes)
   %Documents and Settings%\All Users\Application Data\Adobe\Reader\9.3\ARM\lpk.dll (2105 bytes)
   %System%\hra33.dll (7 bytes)
   %Documents and Settings%\All Users\Application Data\Adobe\Reader\9.3\ARM\18298\lpk.dll (2105 bytes)
   %System%\zqxxme.exe (2105 bytes)

5. Restore the original content of the HOSTS file (%System%\drivers\etc\hosts): 127.0.0.1 localhost
   
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