Full description

Virus:	Worm/Conficker.Z.38
Date discovered:	17/08/2009
Type:	Worm
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Medium
Damage Potential:	Low to medium
Static file:	Yes
File size:	167.071 Bytes
MD5 checksum:	2c8442c4a9328a5cf26650fa6fe743ef
IVDF version:	7.01.05.119 - Monday, August 17, 2009

General Methods of propagation:
   • Autorun feature
   • Local network

Aliases:
   • Mcafee: W32/Conficker.worm.gen.a
   • Panda: W32/Conficker.C.worm
   • Eset: Win32/Conficker.AE

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"="Provides a common interface and object model to access management information about operating system, devices, applications and services. If this service is stopped, most Windows-based software will not function properly. If this service is disabled, any services that explicitly depend on it will fail to start."
   • "DisplayName"="Update Driver"
   • "ErrorControl"=dword:0x00000000
   • "ImagePath"="%SystemRoot%\system32\svchost.exe -k netsvcs"
   • "ObjectName"="LocalSystem"
   • "Start"=dword:0x00000002
   • "Type"=dword:0x00000020

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"

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Epoch]
   New value:
   • "Epoch"=dword:0x00000030

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:
– MS04-007 (ASN.1 Vulnerability)
– 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:
   • vcxhnoiftekm
   • whbutqjjhtfzpy
   • dvkwjdesgb

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 vrijdag 10 december 2010
Description updated by Petre Galan on vrijdag 10 december 2010

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