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Backdoor:MSIL/Pontoeb.J

First posted on 26 December 2011.
Source: Microsoft

Aliases :

Backdoor:MSIL/Pontoeb.J is also known as Trojan.MulDrop3.21941 (Dr.Web), Backdoor.MSIL.Agent.fyc (Kaspersky), Backdoor:MSIL/Bafrus.J (other).

Explanation :

Backdoor:MSIL/Pontoeb.J is a trojan that may allow backdoor access and control of an affected computer.


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Backdoor:MSIL/Pontoeb.J is a trojan that may allow backdoor access and control of an affected computer.



Installation

Backdoor:MSIL/Pontoeb.J may be distributed as a file with an enticing name such as "Need.For.Speed.The.Run.Unlocked-TF.exe" or "Dota 2 Betakeys.txt.exe". Once run, it drops copies if itself as the following:

• %AppData%\wscntfy.exe
• %CommonProgramFiles%\lsmass.exe

The registry is modified to run the trojan files at each Windows start.

In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Sets value: "Windows-Audio Driver"
With data: "%AppData%\wscntfy.exe"

In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
Sets value: "Windows-Network Component"
With data: "%CommonProgramFiles%\lsmass.exe"



Payload

Bypasses Windows firewall

This trojan modifies the Windows firewall policy by changing registry data to allow the trojan to bypass Windows firewall.

In subkey: HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
Sets value: "%AppData%\wscntfy.exe"
With data: "%AppData%\wscntfy.exe:*:enabled:windows-audio driver"

In subkey: HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
Sets value: "%AppData%\wscntfy.exe"
With data: "%AppData%\wscntfy.exe:*:enabled:windows-audio driver"

Redirects log session tracing

Backdoor:MSIL/Pontoeb.J hinders network traffic debugging of an affected computer by modifying registry data to redirect event tracing.

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg
Sets value: "LogSessionName"
With data: "stdout"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg\traceIdentifier
Sets value: "Guid"
With data: "5f31090b-d990-4e91-b16d-46121d0255aa"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy
Sets value: "LogSessionName"
With data: "stdout"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy\traceIdentifier
Sets value: "Guid"
With data: "5f31090b-d990-4e91-b16d-46121d0255aa"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil
Sets value: "LogSessionName"
With data: "stdout"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil\traceIdentifier
Sets value: "Guid"
With data: "8aefce96-4618-42ff-a057-3536aa78233e"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\NAP\Netsh
Sets value: "LogSessionName"
With data: "stdout"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\NAP\Netsh\Napmontr
Sets value: "Guid"
With data: "710adbf0-ce88-40b4-a50d-231ada6593f0"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\qagent
Sets value: "LogSessionName"
With data: "stdout"

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\qagent\traceIdentifier
Sets value: "Guid"
With data: "b0278a28-76f1-4e15-b1df-14b209a12613"

Allows backdoor access and control

Backdoor:MSIL/Pontoeb.J may connect to the IP address "77.<removed>.4.101" to allow a remote attacker to access and control the affected computer. These commands may include, but are not limited to, the following:

• Connect to a specified website
• Download files
• Gather the following information about the affected computer:
  • Disk drive serial number
  • System drive details
  • Operating system
  • Processor architecture
• Perform HTTP, SYN, and UDP flooding
• Update itself

Analysis by Francis Allan Tan Seng

Last update 26 December 2011

 

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