MD5: 08d2f16d28b23f585176f05e50e51018
SHA1: 4071eaea0b40bf26183cdb932f1537e664f44913
SHA256: 89b28a1a74ab93e52dafaa80b14167d94096a6da30b8d9fec79ca33c2a083507
SSDeep: 192:7v5gE7LdH nlaurmQs9pFsrK9ZnZnJSfsvAvhEiHB6zdvlpF:7lHdel5rmQDrK97YhYzdvlL
Size: 12800 bytes
File type: EXE
Platform: WIN32
Entropy: Not Packed
PEID: UPolyXv05_v6
Company: no certificate found
Created at: 2014-03-11 09:55:02
Analyzed on: WindowsXP SP3 32-bit

Summary:

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

Payload

Process activity

The Trojan creates the following process(es):

%original file name%.exe:1844

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

File activity

The process %original file name%.exe:1844 makes changes in the file system.
The Trojan creates and/or writes to the following file(s):

%WinDir%\hw.exe (12 bytes)
%WinDir%\hw.inf (198 bytes)
%System%\drivers\etc\hosts (1 bytes)

Registry activity

The process %original file name%.exe:1844 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:
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]
"Host Write" = "%WinDir%\hw.exe"

Network activity (URLs)

No activity has been detected.

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 1104 bytes in size. The following strings are added to the hosts file listed below:

Rootkit activity

No anomalies have been detected.

Propagation

A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Trojan's file once a user opens a drive's folder in Windows Explorer.

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. Terminate malicious process(es) (How to End a Process With the Task Manager):
   

   %original file name%.exe:1844

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

   %WinDir%\hw.exe (12 bytes)
   %WinDir%\hw.inf (198 bytes)
   %System%\drivers\etc\hosts (1 bytes)

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

   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "Host Write" = "%WinDir%\hw.exe"

5. Restore the original content of the HOSTS file (%System%\drivers\etc\hosts):
   127.0.0.1 localhost
   
6. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
   

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.