MD5: efa8c342dff536ddbdd9bb4b93115c9f
SHA1: 8f842aea3409edc7cb6ce430e34d89662e5d9d6a
SHA256: a507d4afb2a6aee2efc4dfaad4828e4f360c4872684fb7ffed547b4774be7558
SSDeep: 1536:Vmeq7WuHEqU0xlayH2mmJ7KKugJz2NKXnvaLk:VdeHEKuyH2vJ7KsyNIag
Size: 71168 bytes
File type: DLL
Platform: WIN32
Entropy: Probably Packed
PEID: UPolyXv05_v6
Company: no certificate found
Created at: 2010-06-08 12:59:36

Summary:

Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).

Payload

No specific payload has been found.

Process activity

The DDoS creates the following process(es):

dwwin.exe:1464
regsvr32.exe:1792
hrl1.tmp:1560

File activity

The process dwwin.exe:1464 makes changes in the file system.
The DDoS creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\Q50NKF49\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\CWK2PQBY\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\History\History.IE5\desktop.ini (159 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\S96Z4XA3\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\4L2VW563\desktop.ini (67 bytes)

The process regsvr32.exe:1792 makes changes in the file system.
The DDoS creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\hrl1.tmp (63 bytes)

The process hrl1.tmp:1560 makes changes in the file system.
The DDoS creates and/or writes to the following file(s):

%System%\hydhyi.exe (63 bytes)

Registry activity

The process regsvr32.exe:1792 makes changes in the system registry.
The DDoS creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "2A AD C9 E3 AA 25 95 1D A0 82 58 75 4D 3B 55 11"

Network activity (URLs)

URL	IP
ytrkkq.com	Unresolvable
zsgjyb.com	Unresolvable
uirlhu.com	Unresolvable
eiyeie.com	Unresolvable
gjaiqe.com	Unresolvable
okjsuu.com	Unresolvable
ttcbzi.com	Unresolvable

HOSTS file anomalies

The DDoS 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:

Rootkit activity

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

NtQueryInformationProcess
ZwOpenFile
NtDeviceIoControlFile
NtCreateProcessEx
NtCreateProcess
NtCreateFile

Propagation

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):
   

   dwwin.exe:1464
   regsvr32.exe:1792
   hrl1.tmp:1560

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

   %Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\Q50NKF49\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\CWK2PQBY\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\History\History.IE5\desktop.ini (159 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\S96Z4XA3\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\Temporary Internet Files\Content.IE5\4L2VW563\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\hrl1.tmp (63 bytes)
   %System%\hydhyi.exe (63 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.