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Trojan.NSIS.StartPage_4684f726a3


Trojan.StartPage (VIPRE), Trojan-Downloader.Win32.Grinidou (A) (Emsisoft), Artemis!4684F726A3B3 (McAfee), WS.Reputation.1 (Symantec), NSIS:Adware-MT [PUP] (Avast), Trojan.NSIS.StartPage.FD, mzpefinder_pcap_file.YR (Lavasoft MAS)Behaviour: Trojan-Downloader, Trojan, PUP, Adware

The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.

Summary

MD5: 4684f726a3b3fce9bc8b4c579f980811

SHA1: 2e9c86738fd2a7f2d77c96ae8248010b6a633523

SHA256: bd2d22daf59bc4e3aa68d76f12cd063d4a99de83bcf56fe3d6730e9c7b8e1ceb

SSDeep: 1536:Hf4exGDkeZ4mOoSgJEAJJGxc0aCCPU5Bf7i1sCyLBTzDbuS:/4eYZ4 1JXJJAdsUPzi1srLsS

Size: 81082 bytes

File type: EXE

Platform: WIN32

Entropy: Packed

PEID: UPolyXv05_v6

Company: no certificate found

Created at: 2009-06-19 00:33:32

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).

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

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

%original file name%.exe:832

File activity

The process %original file name%.exe:832 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\nsv2.tmp\NSISdl.dll (14 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\nsv2.tmp\System.dll (11 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\nsv2.tmp\me.ini (636 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\BaiduAn_Setup_1.0.567.829_Sid_80158_Silent_Defense.exe (378001 bytes)

The Trojan deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\nsq1.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\nsv2.tmp\me.ini.log (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\nsv2.tmp (0 bytes)

Registry activity

The process %original file name%.exe:832 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5C FD AD 05 58 92 18 50 8D 9D 20 0D 49 F4 2D C6"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Programs" = "%Documents and Settings%\%current user%\Start Menu\Programs"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Â̶¹ä¯ÀÀÆ÷]
"DisplayName" = "Â̶¹ä¯ÀÀÆ÷ 1.0.0.0"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Â̶¹ä¯ÀÀÆ÷]
"Publisher" = "a116"
"DisplayVersion" = "1.0.0.0"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Internet Explorer\Main]
"Start Page" = "http://www.p100.pw"

[HKLM\SOFTWARE\Microsoft\Internet Explorer\Main]
"Start Page" = "http://www.p100.pw"

Network activity (URLs)

URL IP
hxxp://h5.xjtj.org/open/open.ini?name=%original file name%.exe&ini=me.ini (SURICATA HTTP invalid content length field in response )222.216.190.64
hxxp://h5.xjtj.org/setup/?name=%original file name%.exe&mac=00-0C-29-7C-CD-1F&md5=&ini=me.ini&v=1.0.0.0
down.begrp.org222.186.60.12


HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

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. Terminate malicious process(es) (How to End a Process With the Task Manager):No processes have been created.
  2. Delete the original Trojan file.
  3. Delete or disinfect the following files created/modified by the Trojan:

    %Documents and Settings%\%current user%\Local Settings\Temp\nsv2.tmp\NSISdl.dll (14 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\nsv2.tmp\System.dll (11 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\nsv2.tmp\me.ini (636 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\BaiduAn_Setup_1.0.567.829_Sid_80158_Silent_Defense.exe (378001 bytes)

  4. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  5. 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