Trojan.SH.MALXMR.UWEJJ

 Analysis by: Jemimah Mae Molina

 ALIASES:

BV:Miner-BR [Drp] (AVAST)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan 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:

14,145 bytes

File Type:

Other

Memory Resident:

No

Initial Samples Received Date:

14 May 2019

Payload:

Connects to URLs/IPs

Arrival Details

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

Other System Modifications

This Trojan modifies the following file(s):

  • /root/.ssh/authorized_keys → appends the attacker's SSH public-key (creates the file instead, if it does not exist)

Process Termination

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

  • biosetjenkins
  • Loopback
  • apaceha
  • cryptonight
  • stratum
  • mixnerdx
  • performedl
  • JnKihGjn
  • irqba2anc1
  • irqba5xnc1
  • irqbnc1
  • ir29xc1
  • conns
  • irqbalance
  • crypto-pool
  • minexmr
  • XJnRj
  • mgwsl
  • pythno
  • jweri
  • lx26
  • NXLAi
  • BI5zj
  • askdljlqw
  • minerd
  • minergate
  • Guard.sh
  • ysaydh
  • bonns
  • donns
  • kxjd
  • Duck.sh
  • bonn.sh
  • conn.sh
  • kworker34
  • kw.sh
  • pro.sh
  • polkitd
  • acpid
  • icb5o
  • nopxi
  • irqbalanc1
  • minerd
  • i586
  • gddr
  • mstxmr
  • ddg.2011
  • wnTKYg
  • deamon
  • disk_genius
  • sourplum
  • polkitd
  • nanoWatch
  • zigw
  • devtool
  • systemctI
  • WmiPrwSe
  • sysguard
  • sysupdate
  • networkservice
  • Process that contains the following strings in its commandline:
    • {BLOCKED}e.{BLOCKED}eropool.com
    • {BLOCKED}l.{BLOCKED}ls.ru
    • {BLOCKED}r.{BLOCKED}to-pool.fr:8080
    • {BLOCKED}r.{BLOCKED}to-pool.fr:3333
    • {BLOCKED}n@yahoo.com
    • {BLOCKED}hash.com
    • /tmp/a7b104c270
    • {BLOCKED}r.{BLOCKED}to-pool.fr:6666
    • {BLOCKED}r.{BLOCKED}to-pool.fr:7777
    • {BLOCKED}r.{BLOCKED}to-pool.fr:443
    • {BLOCKED}m.f2pool.com:8888
    • {BLOCKED}l.eu
    • xiaoyao
    • xiaoxue
    • var, lib, jenkins and "\-c", without httPort and headless
    • ./{numbers} -c
    • stratum

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • https://{BLOCKED}rain.com/api/download/Y0o4foA1
  • http://{BLOCKED}.{BLOCKED}.42.229:8667/6HqJB0SPQqbFbHJD/sysupdate
  • http://{BLOCKED}.{BLOCKED}.42.229:8667/6HqJB0SPQqbFbHJD/update.sh
  • https://{BLOCKED}rain.com/api/download/OMKMU5Td
  • http://{BLOCKED}.{BLOCKED}.42.229:8667/6HqJB0SPQqbFbHJD/networkservice
  • https://{BLOCKED}rain.com/api/download/heQcwPs3
  • http://{BLOCKED}.{BLOCKED}.42.229:8667/6HqJB0SPQqbFbHJD/sysguard

It connects to the following URL(s) to download its configuration file:

  • http://{BLOCKED}.{BLOCKED}.42.229:8667/6HqJB0SPQqbFbHJD/config.json

It saves the files it downloads using the following names:

Other Details

This Trojan does the following:

  • It puts SELinux in permissive mode and disables SELinux by appending "SELINUX=disabled" to /etc/sysconfig/selinux..
  • It clears PageCache, dentries and inodes.
  • It clears the following objects:
    • history
    • /var/spool/mail/root
    • /var/log/wtmp
    • /var/log/secure
    • /root/.bash_history
  • It write protects the following files:
    • {directory}/sysupdate
    • {directory}/networkservice
    • {directory}/sysguard
    • {directory}/update.sh
    • {directory}/config.json
  • It creates the following cron job to enable automatic execution of update.sh:
    • Path: '/var/spool/cron/crontabs/'"$USER"
      Schedule: Every 30 minutes
      Command: */30 * * * * sh {directory}/update.sh >/dev/null 2>&1
  • It resets the IP policy table.
  • It adds rules to block outgoing connections via ports 3333, 5555, 7777, 9999.
  • It adds a rule to block incoming connections from 43.245.222.57.
  • If /etc/sysupdates is found, {directory} will be set to /etc, /tmp otherwise.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.112.01

FIRST VSAPI PATTERN DATE:

14 May 2019

VSAPI OPR PATTERN File:

15.113.00

VSAPI OPR PATTERN Date:

15 May 2019

Scan your computer with your Trend Micro product to delete files detected as Trojan.SH.MALXMR.UWEJJ. 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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