Analysis by: Bren Matthew Ebriega
ALIASES:

Riskware/CoinMiner (FORTINET); HEUR:RiskTool.Linux.BitCoinMiner.n (KASPERSKY)

 PLATFORM:

Linux

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

  • Threat Type: Coinminer

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

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

  TECHNICAL DETAILS

File Size: 10,561,096 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 30 Apr 2021
Payload: Terminates processes, Connects to URLs/IPs

Arrival Details

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

Installation

This Coinminer drops the following files:

  • /tmp/systemd_conjestion_helper → Detected as Trojan.SH.MALXMR.UWEKW
  • /tmp/systemd_conjestion/systemd_conjestion → detected as Coinminer.Linux.MALXMR.SMDSL64
  • /tmp/systemd_conjestion/config.json → Contains mining parameters to be used.
  • /tmp/{username}/run_script/{random}.sh -> Drops one for every command it runs.
  • /tmp/.d
  • /tmp/ds
  • /tmp/.tmpEcwPCf
  • /tmp/.syslogdmn_lck

It drops the following copies of itself into the affected system:

  • var/tmp/syslogdmn
  • /tmp/syslogdmn
  • /home/{username}/.syslogdmn
  • If ran as a super user:
    • /etc/cron.monthly/log
    • /etc/cron.weekly/crontabtimer
    • /etc/cron.daily/logrotatedmn
    • /etc/cron.hourly/rootd
    • /usr/local/sbin/syslogdmn
    • /usr/local/bin/syslogdmn
    • /sbin/syslogdmn
    • /bin/syslogdmn
    • /usr/sbin/syslogdmn
    • /usr/bin/syslogdmn
    • /root/.syslogdmn

It adds the following processes:

  • sh /tmp/{username}/run_script/{random}.sh → One for every command it runs.
  • nohup /tmp/systemd_conjestion/systemd_conjestion >/dev/null 2>&1 &

It creates the following folders:

  • /tmp/{username}/
  • /tmp/{username}/run_script/
  • /tmp/systemd_conjestion/

Other System Modifications

This Coinminer deletes the following files:

  • /bin/kworkerds
  • /dev/shm/z1.sh
  • /etc/cron.d/system
  • /etc/cron.daily/oanacroner
  • /etc/cron.hourly/oanacroner
  • /etc/cron.monthly/oanacroner
  • /etc/init.d/nfstruncate
  • /tmp/bashf
  • /tmp/bashg
  • /tmp/conn
  • /tmp/conns
  • /tmp/crondb
  • /tmp/httpd.conf
  • /tmp/irq.sh
  • /tmp/irqbalanc1
  • /tmp/java2
  • /tmp/kworkerds
  • /tmp/libapache
  • /tmp/pools.txt
  • /tmp/root.sh
  • /tmp/systemd-private-2270f1520zse4c8a94a91c107d5b9d1b-cups.service-sjwnOy
  • /tmp/Xagent2
  • /usr/lib/libiacpkmn.so.3
  • /usr/local/lib/libdns.so
  • /usr/local/lib/libjdk.so
  • /var/tmp/config.json
  • /var/tmp/java2
  • /var/tmp/kworkerds
  • /var/tmp/systemd-private-2270f1520zse4c8a94a91c107d5b9d1b-cups.service-sjwnOy
  • /tmp/{username}/run_script/{random}.sh → After every use
  • /tmp/ds

It deletes the following folders:

  • /tmp/*index_bak*
  • /tmp/*httpd.conf*
  • /tmp/*httpd.conf
  • /tmp/a7b104c270
  • /tmp/Carbon
  • /tmp/systemd_conjestion/

Process Termination

This Coinminer terminates the following processes if found running in the affected system's memory:

  • Processes connected to the following ports:
    • :3333
    • :4444
    • :5555
    • :6666
    • :7777
    • :3347
    • :14444
    • :14433
    • :13531
  • Processes connected to the following IP Address:
    • {BLOCKED}.{BLOCKED}.55.86:443
    • {BLOCKED}.{BLOCKED}.65.238
    • {BLOCKED}.{BLOCKED}.52.87
    • {BLOCKED}.{BLOCKED}.44.93
    • {BLOCKED}.{BLOCKED}.54.205
    • {BLOCKED}.{BLOCKED}.142.232
    • {BLOCKED}.{BLOCKED}.133.20
    • {BLOCKED}.{BLOCKED}.142.249
    • {BLOCKED}.{BLOCKED}.193.110
    • {BLOCKED}.{BLOCKED}.142.225
    • {BLOCKED}.{BLOCKED}.142.246
    • {BLOCKED}.{BLOCKED}.200.177
    • {BLOCKED}.{BLOCKED}.142.250
    • {BLOCKED}.{BLOCKED}.142.251
    • {BLOCKED}.{BLOCKED}.200.178
    • {BLOCKED}.{BLOCKED}.202.177
    • {BLOCKED}.{BLOCKED}.223.190
    • {BLOCKED}.{BLOCKED}.232.9
    • {BLOCKED}.{BLOCKED}.89.10
    • {BLOCKED}.{BLOCKED}.40.46
  • Processes with the following strings in its commandline:
    • {BLOCKED}l.eu
    • mine.{BLOCKED}pool.com
    • xmr.{BLOCKED}-pool.fr:8080
    • xmr.{BLOCKED}-pool.fr:3333
    • xmr.{BLOCKED}-pool.fr:6666
    • xmr.{BLOCKED}-pool.fr:7777
    • xmr.{BLOCKED}-pool.fr:443
    • prohash
    • 11231
    • Silence
    • wipefs
    • Xagent2
    • webchainminer
    • conjestion
    • {BLOCKED}ol.org
    • {BLOCKED}r.com
    • {BLOCKED}txmr.com
    • {BLOCKED}l.net
    • {BLOCKED}ate.com
    • {BLOCKED}r.com
    • {BLOCKED}ult.pro
    • {BLOCKED}MR.com
    • {BLOCKED}va.cc
    • {BLOCKED}Ocean.stream
    • {BLOCKED}l.de
    • {BLOCKED}o.be
    • {BLOCKED}h.net
    • xmr.{BLOCKED}l.online
    • monero.{BLOCKED}s.to
    • {BLOCKED}ool.com
    • {BLOCKED}l.xyz
    • {BLOCKED}nero.gq
    • {BLOCKED}i.cn
    • {BLOCKED}d.com
    • {BLOCKED}ool.com
    • {BLOCKED}tmining.com
    • monero.{BLOCKED}s.pro
    • berods
    • vmlinuz
    • dblaunchs
    • khugepageds
    • systemctI
    • webchainpool
    • {BLOCKED}ning.com
    • {BLOCKED}n@yahoo.com
    • {BLOCKED}hash.com
    • stratum.{BLOCKED}l.com:8888
    • nTKYg
    • qW3xT.2
    • ddgs.3013
    • ddgs.3012
    • biosetjenkins
    • AnXqV.yam
    • xmrigDaemon
    • xmrigMiner
    • xmrig
    • apaceha
    • cryptonight
    • stratum
    • performedl
    • irqba2anc1
    • irqba5xnc1
    • irqbnc1
    • ir29xc1
    • conns
    • irqbalance
    • crypto-pool
    • minexmr
    • XJnRj
    • NXLAi
    • BI5zj
    • askdljlqw
    • minerd
    • minergate
    • ysaydh
    • bonns
    • donns
    • Duck.sh
    • bonn.sh
    • conn.sh
    • kworker34
    • kw.sh
    • pro.sh
    • polkitd
    • acpid
    • icb5o
    • nopxi
    • irqbalanc1
    • mstxmr
    • deamon
    • disk_genius
    • 42HrCwmHSVyJSAQwn6Lifc3WWAWN56U8s2qAbm6BAagW6Ryh8JgWq8Q1JbZ8nXdcFVgnmAM3q86cm5y9xfmvV1ap6qVvmPe
    • 4BrL51JCc9NGQ71kWhnYoDRffsDZy7m1HUU7MRU4nUMXAHNFBEJhkTZV9HdaL4gfuNBxLPc3BeMkLGaPbF5vWtANQt989KEfGRt6Ww2Xg8
    • 46SDR76rJ2J6MtmP3ZZKi9cEA5RQCrYgag7La3CxEootQeAQULPE2CHJQ4MRZ5wZ1T73Kw6Kx4Lai2dFLAacjerbPzb5Ufg
    • 45cToD1FzkjAxHRBhYKKLg5utMGENqyamWrY8nLNkVQ4hJgLHex1KNRZcz4finRjMpAYmPxDaXVpN2rV1jMNyXRdMEaH1YA
    • 45hsTaSqTQM4K1Xeqkcy7eLzqdEuQ594fJVmQryCemQSCU878JGQdSDCxbhNyVjSkiaYat8yAfBuRTPSEUPZoARm9a5XEHZ
    • 47sghzufGhJJDQEbScMCwVBimTuq6L5JiRixD8VeGbpjCTA12noXmi4ZyBZLc99e66NtnKff34fHsGRoyZk3ES1s1V4QVcB
    • 44iuYecTjbVZ1QNwjWfJSZFCKMdceTEP5BBNp4qP35c53Uohu1G7tDmShX1TSmgeJr2e9mCw2q1oHHTC2boHfjkJMzdxumM
    • 49hNrEaSKAx5FD8PE49Wa3DqCRp2ELYg8dSuqsiyLdzSehFfyvk4gDfSjTrPtGapqcfPVvMtAirgDJYMvbRJipaeTbzPQu4
    • 4AniF816tMCNedhQ4J3ccJayyL5ZvgnqQ4X9bK7qv4ZG3QmUfB9tkHk7HyEhh5HW6hCMSw5vtMkj6jSYcuhQTAR1Sbo15gB
    • 4813za7ePRV5TBce3NrSrugPPJTMFJmEMR9qiWn2Sx49JiZE14AmgRDXtvM1VFhq

Other Details

This Coinminer does the following:

  • If run as a super user, it creates the following cron jobs for persistence:
    • Path: /var/spool/cron/root
      • Schedule: Every 10 minutes
      • Command: 0,10,20,30,40,50 0-23 * * * nohup syslogdmn >/dev/null 2>&1 &
    • Path: /etc/crontab
      • Schedule: Every 10 minutes
      • Command: 0,10,20,30,40,50 0-23 * * * root nohup syslogdmn >/dev/null 2>&1 &
    • Path: /etc/cron.d/root
      • Schedule: Every 10 minutes
      • Command: 0,10,20,30,40,50 0-23 * * * nohup syslogdmn >/dev/null 2>&1 &
    • Path: /var/spool/cron/crontabs/root
      • Schedule: Every 10 minutes
      • Command: 0,10,20,30,40,50 0-23 * * * nohup syslogdmn >/dev/null 2>&1 &
  • It uses the following default details on its coin mining routine (from config.json):
    • Algo: cryptonight
    • Url: {BLOCKED}.{BLOCKED}.28.19:8080
    • User: {user or root}
    • Password: x

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.688.07
FIRST VSAPI PATTERN DATE: 30 Apr 2021
VSAPI OPR PATTERN File: 16.689.00
VSAPI OPR PATTERN Date: 01 May 2021

Scan your computer with your Trend Micro product to delete files detected as Coinminer.Linux.MALXMR.PUWEMD. 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 the following Trend Micro Support pages for more information:


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