Submission Summary:

What's been foundSeverity Level
Replication across networks by exploiting weakly restricted shares (common for Randex family of worms).
Produces outbound traffic.
Contains characteristics of an identified security risk.

 

Technical Details:

 

Possible Security Risk

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%\Microsoft\Installer\{B53D42E8-872B-430E-82D4-80065A31FCE1}\lpk.dll
[pathname with a string SHARE]\lpk.dll
[pathname with a string SHARE]\lpk.dll
[pathname with a string SHARE]\lpk.dll
%ProgramFiles%\Internet Explorer\Connection Wizard\lpk.dll
%ProgramFiles%\Internet Explorer\lpk.dll
%ProgramFiles%\Messenger\lpk.dll
%System%\hra33.dll
55,296 bytes MD5: 0x4D116C0C1B2454D0D957EFE7CC5EAA63
SHA-1: 0xB8BEC08815A6CC491ECE00BA539A2D8D613C62E6
(not available)
2 [file and pathname of the sample #1]
%Windir%\yygeym.exe
43,008 bytes MD5: 0x7F25F746A08E97C055906F2338F74FCB
SHA-1: 0xFF0FCFF21BE072DB8A8104FD5C3A501DB674A413
Mal/Behav-031 [Sophos]
Backdoor.Win32.Inject [Ikarus]
packed with UPX [Kaspersky Lab]

 

Memory Modifications

Process NameProcess FilenameMain Module Size
yygeym.exe%Windir%\yygeym.exe118,784 bytes
[filename of the sample #1][file and pathname of the sample #1]118,784 bytes

Module NameModule FilenameAddress Space Details
hra33.dll%System%\hra33.dllProcess name: yygeym.exe
Process filename: %Windir%\yygeym.exe
Address space: 0x3A0000 - 0x3B1000

Service NameDisplay NameStatusService Filename
Defghi Klmnopqr TuwDefghi Klmnopqr Tuvwxyab Defw"Running"%Windir%\yygeym.exe

 

Registry Modifications

 

Other details

China

PortProtocolProcess
1033TCPyygeym.exe (%Windir%\yygeym.exe)

Remote HostPort Number
520hack.f3322.net9000

 

Outbound traffic (potentially malicious)

 

Heuristics Analysis

 

 

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