Trojan.SH.MALXMR.UWEJJ
BV:Miner-BR [Drp] (AVAST)
Linux
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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
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:
- {directory}/sysupdate → detected as Coinminer.Linux.MALXMR.UWEJJ
- {directory}/update.sh → copy of itself
- {directory}/config.json → coinminer configuration file
- {directory}/networkservice → detected as HackTool.Linux.ExploitScan.AA
- {directory}/sysguard → detected as Trojan.Linux.WATCHGO.AA
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/'"$USER"
Schedule: Every 30 minutes
Command: */30 * * * * sh {directory}/update.sh >/dev/null 2>&1
- Path: '/var/spool/cron/crontabs/'"$USER"
- 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
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:
Did this description help? Tell us how we did.