TR/Agent.NL.21 - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Agent.NL.21
Date discovered:	11/09/2006
Type:	Trojan
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	82.944 Bytes
MD5 checksum:	4e19ffc16eaca8513df29d1489e69396
VDF version:	6.35.01.208 - Mon, 11 Sep 2006 13:56 (GMT+1)
IVDF version:	6.35.01.212 - Tue, 12 Sep 2006 07:30 (GMT+1)

General Alias:
   • Kaspersky: Trojan.Win32.Agent.nl

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP

Side effects:
   • Blocks access to security websites
   • Registry modification
   • Third party control

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

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • "Explorer 2238"=%malware execution directory%\%executed file%

The values of the following registry keys are removed:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\DCOM Server
– HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\DCOM Server

The following registry keys are added:

– HKLM\SOFTWARE\Classes\CLSID\{2C1CD3D7-86AC-4068-93BC-A02304BB2238}\
   InProcServer32
   • "(Default)""=%malware execution directory%\%executed file%
   • "ThreadingModel"="Apartment"

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   SharedTaskScheduler
   • "{2C1CD3D7-86AC-4068-93BC-A02304BB2238}"="DCOM Server 2238"

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\
   ShellServiceObjectDelayLoad
   • "DCOM Server 2238"="{2C1CD3D7-86AC-4068-93BC-A02304BB2238}"

Hosts The host file is modified as explained:

– In this case already existing entries remain unmodified.

– Access to the following domains is effectively blocked:
   • www.trendmicro.com; rads.mcafee.com; customer.symantec.com;
      liveupdate.symantec.com; us.mcafee.com; updates.symantec.com;
      www.nai.com; secure.nai.com; dispatch.mcafee.com; download.mcafee.com;
      www.my-etrust.com; mast.mcafee.com; ca.com; www.ca.com;
      networkassociates.com; www.networkassociates.com; avp.com;
      www.kaspersky.com; www.avp.com; downloads4.kaspersky-labs.com;
      downloads3.kaspersky-labs.com; downloads2.kaspersky-labs.com;
      downloads1.kaspersky-labs.com; www.f-secure.com; viruslist.com;
      www.viruslist.com; liveupdate.symantecliveupdate.com; www.mcafee.com;
      sophos.com; www.sophos.com; securityresponse.symantec.com;
      www.symantec.com

Backdoor The following port is opened:

– %executed file% on a random TCP port

Contact server:
The following:
   • 208.66.195**********:2238

Remote control capabilities:
    • Disable DCOM
    • Download file
    • Send emails

Miscellaneous Mutex:
It creates the following Mutexes:
• hs5pdllv42238
• hs5p_av_mutex

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 the following runtime packer:
• UPX

See a brief description here.

Description inserted by Bogdan Iliuta on Mon, 02 Oct 2006 16:12 (GMT+1)
Description updated by Bogdan Iliuta on Fri, 27 Oct 2006 09:14 (GMT+1)

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