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BKDR_FAKEAP.TY

June 15, 2015
 ALIASES:

W32/Agent.DOGS!tr.bdr (Fortinet), Backdoor.Win32.Agent.dogs (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

49,152 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Jun 2015

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

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

HKLM\SYSTEM\ControlSet001\
services\SharedAccess\Parameters\
FirewallPolicy\FirewallRules
{GUID} = v{version}|Action=Allow|Active=TRUE|Dir=In|Protocol=6|LPort=7481|Name=Trend|

Backdoor Routine

This backdoor opens the following port(s) where it listens for remote commands:

  • 7481

It executes the following commands from a remote malicious user:

  • Terminate itself
  • Perform remote shell commands
  • Send result of performed shell commands
  • Create File
  • Write File
  • Read File

NOTES:

The registry entries mentioned above are added after this malware performs the following command:

netsh advfirewall firewall add rule
name=Trend protocol=TCP dir=in
localport=7481 action=allow

  SOLUTION

Minimum Scan Engine:

9.750

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as BKDR_FAKEAP.TY

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\FirewallRules
    • {GUID}

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_FAKEAP.TY. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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