WORM_KELIHOS.CDS

This malware sends out spam e-mails with malicious links where other malware can be downloaded.

This worm may be downloaded from remote sites by other malware.

Arrival Details

This worm may be downloaded from remote site(s) by the following malware:

• TROJ_KELIHOS.SMA

It may be downloaded from the following remote sites:

• http://{BLOCKED}r.com/client1.exe

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SmartIndex = "{malware path and file name}.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\Software\Google

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Google
ID = 50

HKEY_CURRENT_USER\Software\Google
ID2 = {random values}

HKEY_CURRENT_USER\Software\Google
ID3 = {random values}

HKEY_CURRENT_USER\Software\Google
AppID = "{random characters}"

It creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\AuthorizedApplications\List
{malware path and file name}.exe = "{malware path and file name}.exe:*:Enabled:Promo"

NOTES:
It adds the following registry entries to allow connections to TCP port 80 and UDP port 53.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
80:TCP="80:TCP:*:Enabled:Promo"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
53:UDP="53:UDP:*:Enabled:Promo"

It sends out spam e-mails which contain links to TROJ_KELIHOS.SMA. This Trojan, in turn, downloads WORM_KELIHOS.CDS. Note, however, that the binaries downloaded from the link may change depending on what infected machine they are retrieved, which changes.

It sends a GET request to the server to download an encrypted data, which contains information on its spamming routine.

From: {name of sender}
Subject: {subject}
Message Body:
{name of sender} {message 1}
{message 2}
{message 3}
{malicious link}

• {Name of sender}:
  • Abraham
  • Adalbert
  • Baldwin
  • Barbara
  • Candida
  • Carol
  • Daniel
  • Dannie
  • Eddie
  • Edgar
  • Fanny
  • Felicia
  • Gabriel
  • Geffrey
  • Hadrian
  • Hannah
  • Irene
  • Isaac
  • Jacob
  • James
  • Katharine
  • Kathleen
  • Lambert
  • Laura
  • Mabel
  • Madeleine
  • Nance
  • Nancy
  • Odette
  • Olive
  • Paddy
  • Patricia
  • Rachel
  • Ralph
  • Sadie
  • Sally
  • Teddy
  • Terry
  • Valentine
  • Veronica
  • Wallace
  • Walter
• {subject}I made an Ecard for U!

• just mailed to you
• wants to show you
• has created for you

• a postcard.
• an ecard.
• a digital postcard.
• an Online greeting card.

• Click on the link below to see your greeting card:
• Collect your E-card here:
• It is waiting for you at our card site, go ahead and see it! To pick up your greeting card, click on the following link at anytime within the next 30 days:
• To view the ecard simply click the link below:

{malicious link} can be any link where TROJ_KELIHOS.SMA can be downloaded.

It communicates via a peer-to-peer (P2P) mechanism by connecting to other computers infected with this malware through TCP port 80. This type of communication is usually referred to as HTTP2P. It then gets the list of IP addresses the remote computer has logged and adds them to the list of IP addresses it connects to.

It sends list of IP addresses of infected systems once it receives a remote connection via TCP port 80.