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Virus:TR/Cossta.lzr
Date discovered:16/02/2011
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:26.624 Bytes
MD5 checksum:2089b0f682a8fcd79665a9644150998b
VDF version:7.10.08.215
IVDF version:7.11.03.121 - Wednesday, February 16, 2011

 General Method of propagation:
    Autorun feature


Aliases:
   •  Mcafee: Artemis!2089B0F682A8
   •  Kaspersky: Trojan.Win32.Cossta.lzr
   •  Bitdefender: Trojan.Generic.5229936
   •  Panda: Bck/Hupigon.LLS
     GData: Trojan.Generic.5229936


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops malicious files
   • Registry modification
   • Makes use of software vulnerability
CVE-2007-1204
MS07-019

 Files It copies itself to the following locations:
   • %HOME%\Application Data\engel\updates.exe
   • %drive%\mousedriver.exe



The following file is created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%




It tries to execute the following file:

Filename:
   • %SYSDIR%\netsh.exe" advfirewall firewall add rule name="%executed file%" dir=in action=allow program="%malware execution directory%\%executed file%"

 Registry The following registry key is added in order to run the process after reboot:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "engel"="%HOME%\Application Data\updates\updates.exe"



It creates the following entry in order to bypass the Windows XP firewall:

[HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile]
   • "EnableFirewall"=dword:0x00000000



The following registry key is added:

[HKCU\Software\Microsoft\Internet Explorer\Main]
   • "DHCP"="1973614"
   • "DNS"=""

 Injection – It injects a backdoor routine into a process.

    Process name:
   • netsh.exe


 Miscellaneous Accesses internet resources:
   • http://88.183.145.188/**********;
      http://85.65.176.74/**********;
      http://189.192.200.139/**********;
      http://82.131.26.101/**********;
      http://186.210.129.86/**********;
      http://81.57.215.203/**********;
      http://116.73.120.158/**********;
      http://85.204.169.5/**********;
      http://81.39.177.208/**********;
      http://75.133.44.131/**********;
      http://24.7.229.177/**********;
      http://123.237.42.130/**********;
      http://95.172.110.199/**********;
      http://109.248.37.211/**********;
      http://70.71.190.92/**********;
      http://203.184.2.124/**********;
      http://63.248.102.39/**********;
      http://210.207.211.28/**********;
      http://195.3.229.6/**********;
      http://118.168.198.216/**********;
      http://58.9.40.76/**********;
      http://84.95.100.151/**********;
      http://201.250.143.227/**********;
      http://77.231.34.6/**********;
      http://61.90.124.143/**********;
      http://119.152.52.106/**********;
      http://173.59.254.75/**********;
      http://201.253.112.237/**********;
      http://118.165.7.206/**********;
      http://217.132.110.8/**********;
      http://186.122.241.86/**********;
      http://84.23.135.227/**********;
      http://109.182.62.94/**********;
      http://208.81.160.62/**********;
      http://111.248.202.188/**********;
      http://58.9.49.223/**********;
      http://187.106.13.158/**********;
      http://117.205.35.133/**********;
      http://119.152.99.28/**********;
      http://117.102.33.21/**********;
      http://93.80.23.24/**********;
      http://187.89.41.174/**********;
      http://190.220.60.143/**********;
      http://201.29.8.233/**********;
      http://190.48.147.167/**********;
      http://187.3.112.114/**********;
      http://118.34.56.143/**********;
      http://113.193.184.102/**********;
      http://201.83.236.154/**********;
      http://116.71.185.112/**********;
      http://84.252.53.238/**********;
      http://88.171.207.2/**********;
      http://213.209.162.104/**********;
      http://213.186.183.4/**********;
      http://87.254.142.57/**********;
      http://85.204.47.87/**********;
      http://62.103.174.192/**********


Mutex:
It creates the following Mutex:
   • Ms32Dll

 File details Programming language:
The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Tuesday, April 19, 2011
Description updated by Petre Galan on Tuesday, April 19, 2011

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