SID 1:44692

Rule Category

INDICATOR-OBFUSCATION -- Snort detected a system behavior that suggests the system has been affected by malware. That behavior is known as an Indicator of Compromise (IOC). The symptoms could be a wide range of behaviors, from a suspicious file name to an unusual use of a utility. Symptoms do not guarantee an infection; your network configuration may not be affected by malware, but showing indicators as a result of a normal function. This alert specifically refers to a method of disguising code, known as obfuscation. Obfuscation methods are used to perform innocent convenience tasks (for instance, Javascript used to condense Jquery scripts, or a compiler using obfuscation to protect the full code for NDA reasons), or it could be used to hide an attack.

Alert Message

INDICATOR-OBFUSCATION CoinHive cryptocurrency mining attempt

Rule Explanation

This event is generated when an obfuscated JavaScript file is found that contains the CoinHive cryptocurrency mining library. Impact: Performance on the victims system will be degraded. Details: This rule detects the obfuscated library for CoinHive cryptocurrency mining. This library is used by some attackers to generate additional revenue by using the victims computer to mine cryptocurrency. Ease of Attack:

What To Look For

No information provided

Known Usage

No public information

False Positives

Known false positives, with the described conditions

Due to the obfuscated nature of the library, this rule can be prone to false positives.

Contributors

Cisco Talos Intelligence Group