BKDR_CCHACK.A

September 27, 2017
 Analysis by: Johnlery Triunfante
 Modified by: John Anthony Banes
 ALIASES:

W32/HackedCCleaner.FAF7!tr (FORTINET); Trojan.PRForm.A (BITDEFENDER)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, 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 may be manually installed by a user.

It does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.

It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size:

7,680,216 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

21 Sep 2017

Payload:

Connects to URLs/IPs, Steals information

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.

It may be manually installed by a user.

Other System Modifications

This Backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Piriform\
Agomo

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Piriform\
Agomo
MUID = {value}

HKEY_LOCAL_MACHINE\SOFTWARE\Piriform\
Agomo
TCID = {value}

HKEY_LOCAL_MACHINE\SOFTWARE\Piriform\
Agomo
NID = {value}

Propagation

This Backdoor does not have any propagation routine.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Download and execute arbitrary codes

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • https://216.{BLOCKED}.225.{BLOCKED}

However, as of this writing, the said sites are inaccessible.

Rootkit Capabilities

This Backdoor does not have rootkit capabilities.

Other Details

This Backdoor does the following:

  • It waits for at least 10 minutes before proceeding to its routine.
  • The malware routine terminates if the user is not admin.

It performs DNS requests to the following sites:

  • ab{random hex values}.com
    • If unable to connect to IP https://216.{BLOCKED}.225.{BLOCKED}, it performs this DNS request to get and connect to the second IP address.
    • It uses domain generation algorithm (DGA) for its servers, where {random hex values} is based on the month and year of the system time.
    • The secondary IP address is computed based on the returned IP address from this site.

It gathers the following information and reports it to its servers:

  • Computer name
  • Installed programs and updates
  • OS version
  • System Type (32-bit or 64-bit)
  • Host name
  • Domain name
  • IP Address
  • MAC address
  • Running processes
    • If user admin
    • If process is 64-bit

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.668.02

FIRST VSAPI PATTERN DATE:

19 Sep 2017

VSAPI OPR PATTERN File:

13.669.00

VSAPI OPR PATTERN Date:

20 Sep 2017

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Identify and terminate files detected as BKDR_CCHACK.A

[ 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 4

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\SOFTWARE\Piriform\Agomo
    • MUID = {value}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Piriform\Agomo
    • TCID = {value}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Piriform\Agomo
    • NID = {value}

Step 5

Delete this registry key

[ 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\SOFTWARE\Piriform
    • Agomo

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_CCHACK.A. 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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