Analysis by: Rheniel Rhay Ramos
ALIASES:

HEUR:Exploit.Linux.CVE-2016-5195.a (Kaspersky); ELF:CVE-2016-5195-A [Expl] (Avast); ELF:CVE-2016-5195-A [Expl] (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Exploit

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

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

Once a malware successfully exploits the said vulnerability, it causes certain actions to be done on the system. It takes advantage of certain vulnerabilities.

  TECHNICAL DETAILS

File Size: 14,288 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 17 Oct 2017
Payload: Exploits vulnerability

Arrival Details

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

Other Details

Once a malware successfully exploits the said vulnerability, it causes the following actions to be done on the system:

  • It provides an unprivileged local user a write access to read-only memory mappings, thus increasing their privileges on the system.

It does the following:

  • It accesses the following file:
    • /usr/bin/passwd

It takes advantage of the following vulnerabilities:

  • CVE-2016-5195 (also known as "Dirty COW")

  SOLUTION

Minimum Scan Engine: 9.850

Scan your computer with your Trend Micro product to delete files detected as ELF_MADVISE.DKF. 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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