Need help? Ask the community or hire an expert.
Go to Avira Answers
Virus:Worm/Conficker.S
Date discovered:07/08/2009
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:174.852 Bytes
MD5 checksum:35b3f4ad55e3cf32784ced7b0e035ebe
IVDF version:7.01.05.85 - Friday, August 7, 2009

 General Methods of propagation:
   • Autorun feature
   • Local network


Aliases:
   •  Sophos: Mal/Conficker-A
   •  Panda: W32/Conficker.C.worm
   •  Eset: Win32/Conficker.X


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


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

 Files It copies itself to the following locations:
   • %SYSDIR%\qepdjla.dll
   • %drive%\RECYCLER\%CLSID%\jwgkvsq.vmx



It deletes the initially executed copy of itself.



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:
   • explorer C:

 Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\
   %random character string%]
   • "Description"="Manages IP security policy and starts the ISAKMP/Oakley (IKE) and the IP security driver."
   • "DisplayName"="Security Time"
   • "ErrorControl"=dword:0x00000000
   • "ImagePath"="%SystemRoot%\system32\svchost.exe -k netsvcs"
   • "ObjectName"="LocalSystem"
   • "Start"=dword:0x00000002
   • "Type"=dword:0x00000020



The value of the following registry key is removed:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • Windows Defender



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

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\GloballyOpenPorts\List]
   • "8182:TCP"="8182:TCP:*:Enabled:opijcn"



The following registry key is added:

– [HKLM\SYSTEM\CurrentControlSet\Services\
   %random character string%\Parameters]
   • "ServiceDll"="%SYSDIR%\qepdjla.dll"



The following registry keys are changed:

– [HKCU\Software\Microsoft\Internet Explorer\Toolbar]
   New value:
   • "Locked"=dword:0x00000001

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "DontPrettyPath"=dword:0x00000000
   • "Filter"=dword:0x00000000
   • "Hidden"=dword:0x00000002
   • "HideFileExt"=dword:0x00000000
   • "HideIcons"=dword:0x00000000
   • "MapNetDrvBtn"=dword:0x00000001
   • "SeparateProcess"=dword:0x00000001
   • "ShowCompColor"=dword:0x00000001
   • "ShowInfoTip"=dword:0x00000000
   • "SuperHidden"=dword:0x00000000
   • "WebView"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost]
   New value:
   • "netsvcs"="6to4"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer]
   New value:
   • "ShellState"=hex:24,00,00,00,32,04,00,00,00,00,00,00,00,00,00,00,00,00,00,00,01,00,00,00,0D,00,00,00,00,00,00,00,01,00,00,00

– [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows NT\CurrentVersion\
   Winlogon]
   New value:
   • "ParseAutoexec"="1"

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.


It uses the following login information in order to gain access to the remote machine:

– The following list of passwords:
   • 99999999; 9999999; 999999; 99999; 9999; 999; 99; 88888888; 8888888;
      888888; 88888; 8888; 888; 88; 77777777; 7777777; 777777; 77777; 7777;
      777; 77; 66666666; 6666666; 666666; 66666; 6666; 666; 66; 55555555;
      5555555; 555555; 55555; 5555; 555; 55; 44444444; 4444444; 444444;
      44444; 4444; 444; 44; 33333333; 3333333; 333333; 33333; 3333; 333; 33;
      22222222; 2222222; 222222; 22222; 2222; 222; 22; 11111111; 1111111;
      111111; 11111; 1111; 111; 11; 00000000; 0000000; 00000; 0000; 000; 00;
      0987654321; 987654321; 87654321; 7654321; 654321; 54321; 4321; 321;
      21; 12; fuck; zzzzz; zzzz; zzz; xxxxx; xxxx; xxx; qqqqq; qqqq; qqq;
      aaaaa; aaaa; aaa; sql; file; web; foo; job; home; work; intranet;
      controller; killer; games; private; market; coffee; cookie; forever;
      freedom; student; account; academia; files; windows; monitor; unknown;
      anything; letitbe; letmein; domain; access; money; campus; explorer;
      exchange; customer; cluster; nobody; codeword; codename; changeme;
      desktop; security; secure; public; system; shadow; office; supervisor;
      superuser; share; super; secret; server; computer; owner; backup;
      database; lotus; oracle; business; manager; temporary; ihavenopass;
      nothing; nopassword; nopass; Internet; internet; example; sample;
      love123; boss123; work123; home123; mypc123; temp123; test123; qwe123;
      abc123; pw123; root123; pass123; pass12; pass1; admin123; admin12;
      admin1; password123; password12; password1; default; foobar; foofoo;
      temptemp; temp; testtest; test; rootroot; root; adminadmin;
      mypassword; mypass; pass; Login; login; Password; password; passwd;
      zxcvbn; zxcvb; zxccxz; zxcxz; qazwsxedc; qazwsx; q1w2e3; qweasdzxc;
      asdfgh; asdzxc; asddsa; asdsa; qweasd; qwerty; qweewq; qwewq; nimda;
      administrator; Admin; admin; a1b2c3; 1q2w3e; 1234qwer; 1234abcd;
      123asd; 123qwe; 123abc; 123321; 12321; 123123; 1234567890; 123456789;
      12345678; 1234567; 123456; 12345; 1234; 123



Exploit:
It makes use of the following Exploits:
– MS03-049 (Buffer Overrun in the Workstation Service)
– MS06-040 (Vulnerability in Server Service)


Remote execution:
–It attempts to schedule a remote execution of the malware, on the newly infected machine. Therefore it uses the NetScheduleJobAdd function.

 Injection – It injects a backdoor routine into a process.

    Process name:
   • svchost.exe


 Miscellaneous  Checks for an internet connection by contacting the following web site:
   • http://checkip.dyndns.org


Mutex:
It creates the following Mutexes:
   • uthyigyyamlwq
   • vcxhnoiftekm

 File details 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, December 7, 2010
Description updated by Andrei Ivanes on Thursday, December 9, 2010

Back . . . .