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Undetected XMRig Coinminer


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Sample is here: https://bazaar.abuse.ch/sample/9aaf2a66b2754921fe133385136dc6fbe7bc730d5302a002103980bdfc13a1be/.

VT detection rate is 61/74: https://www.virustotal.com/gui/file/9aaf2a66b2754921fe133385136dc6fbe7bc730d5302a002103980bdfc13a1be

Upon sample archive extraction, file was sent to LiveGuard w/no file locking at all occuring.

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It is from 2020 yet not detected by ESET? Very strange if the sample is not broken somehow which is unlikely based on the behavior on VT. 

Edited by SeriousHoax
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The archive contains NSSM potentially unsafe application which is detected. Besides that there is also an old file svchost.exe from 2018 which is detected by a few AVs but it's probably not malicious per se but loads a batch script from the Sqlite database OnTimer.db. The script download payload from a dead url which used to serve Win64/CoinMiner.OF potentially unwanted application in the past (detected since 2019). I've sent svchost.exe to the viruslab to find out if it's subject to detection or not.

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Posted (edited)
4 hours ago, Marcos said:

The archive contains NSSM potentially unsafe application which is detected.

Is this only upon execution of the sample .exe? It was not detected upon file creation;

Eset_Sample.thumb.png.db15d86a239f0cacf9649c79cf37a60f.png

Ditto for LiveGuard analysis. Does LiveGuard ignore Eset PUA detections?

Quote

Time;Hash;File;Size;Category;Reason;Sent to;User
6/29/2024 5:24:06 PM;A268031D2E74F058CBB2AD984E4A5556F59CFCF8;C:\Users\18436\Downloads\9aaf2a66b2754921fe133385136dc6fbe7bc730d5302a002103980bdfc13a1be.exe;1070725;Executable;Automatic;ESET LiveGuard;xxxxxxxxxxx

-EDIT- I downloaded the sample again. Now Eset detects upon archive extraction;

Quote

Time;Scanner;Object type;Object;Detection;Action;User;Information;Hash;First seen here
6/30/2024 12:13:36 PM;Real-time file system protection;file;C:\Users\xxxxxx\Downloads\9aaf2a66b2754921fe133385136dc6fbe7bc730d5302a002103980bdfc13a1be.exe;multiple detections;deleted;xxxxxxx;Event occurred on a new file created by the application: C:\Program Files\7-Zip\7zG.exe (755AF3328261B37426BC495C6C64BBA0C18870B2).;A268031D2E74F058CBB2AD984E4A5556F59CFCF8;

 

Edited by itman
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