Submission Summary:

What's been foundSeverity Level
Downloads/requests other files from Internet.
Modifies some system settings that may have negative impact on overall system security state.
Creates a startup registry entry.
Contains characteristics of an identified security risk.

 

Technical Details:

 

Possible Security Risk

Security RiskDescription
Email-Worm.Brontok!sd5 Email-Worm.Brontok!sd5 is a mass-mailing application that propagates from one system to another by creating a new email message, attaching itself and then sending the message without user's consent.
Email-Worm.Brontok.Q Email.Worm.Brontok.Q is an email worm that propagates by sending itself to email contacts harvested from an infected machine. This worm employs several anti-removal tactics that will cause a system reboot when triggered.

Threat CategoryDescription
A network-aware worm that attempts to replicate across the existing network(s)

 

File System Modifications

#Filename(s)File SizeFile HashAlias
1 %AppData%\csrss.exe
%AppData%\inetinfo.exe
%AppData%\lsass.exe
%AppData%\services.exe
%AppData%\smss.exe
%AppData%\winlogon.exe
%Programs%\Startup\Empty.pif
%Templates%\Brengkolang.com
%Windir%\eksplorasi.exe
%Windir%\ShellNew\sempalong.exe
[file and pathname of the sample #1]
%System%\%UserName%'s Setting.scr
42,687 bytes MD5: 0x483FCF432217D71544246AA760D98CDC
SHA-1: 0x591B0EC52AD2A306F1CF8AF2FC04125642B1A00B
W32.Rontokbro.K@mm [Symantec]
Email-Worm.Win32.Brontok.q [Kaspersky Lab]
W32/Rontokbro.gen@MM [McAfee]
WORM_RONTKBR.F [Trend Micro]
W32/Brontok-D [Sophos]
Worm:Win32/Brontok.BU@mm [Microsoft]
Email-Worm.Win32.Brontok [Ikarus]
Win32/Brontok.worm.42687.B [AhnLab]
2 %Windir%\Tasks\At1.job 406 bytes MD5: 0x73BB7D2632B30A3AE165F99908CE9C64
SHA-1: 0xBD5B557C8CAACED05834A5C2C55F865954C35B3D
(not available)

 

Memory Modifications

Process NameProcess FilenameMain Module Size
winlogon.exe%AppData%\winlogon.exe253,952 bytes
services.exe%AppData%\services.exe253,952 bytes
lsass.exe%AppData%\lsass.exe253,952 bytes
csrss.exe%AppData%\csrss.exe253,952 bytes
inetinfo.exe%AppData%\inetinfo.exe253,952 bytes
[filename of the sample #1][file and pathname of the sample #1]253,952 bytes
smss.exe%AppData%\smss.exe253,952 bytes

 

Registry Modifications

 

Other details

 

 

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