Analysis by: Johnlery Triunfante
 Modified by: Rheniel Rhay Ramos
ALIASES:

Backdoor:Win32/Floxif (MICROSOFT); W32/HackedCCleaner.FAF7!tr (FORTINET)

 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 does not have any backdoor routine.

  TECHNICAL DETAILS

File Size: 9,791,816 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 15 Aug 2017
Payload: Drop files

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.

Installation

This Backdoor drops and executes the following files:

  • %Program Files%\CCleaner\CCleaner.exe -> detected as BKDR_CCHACK.A

Propagation

This Backdoor does not have any propagation routine.

Backdoor Routine

This Backdoor does not have any backdoor routine.

NOTES:

This is a Trend Micro detection for an installer containing a compromised CCleaner application.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.682.03
FIRST VSAPI PATTERN DATE: 26 Sep 2017
VSAPI OPR PATTERN File: 13.683.00
VSAPI OPR PATTERN Date: 27 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

Remove BKDR_CCHACK.B by using its own Uninstall option

[ Learn More ]
To uninstall the grayware process

Step 4

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