ELF_BEIKDOR.W
HEUR:Backdoor.Linux.Ganiw.a(Kaspersky);Linux/Setag.B(ESET-NOD32);Linux/Backdoor.J(AVG)
Linux
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor 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 backdoor 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 backdoor drops the following files:
- /tmp/notify.file
- /tmp/gates.lock
- /usr/bin/bsd-port/getty.lock
- /tmp/notify.file
- /usr/bin/bsd-port/udevd.lock
- /usr/bin/dpkgd/{module path}
- /tmp/moni.lock
- /tmp/notify.file
NOTES:
This malware adds the following script in /etc/rc{1-5}.d/ and /etc/init.d/ to automatically execute itself when the system starts up:
/etc/rc1.d/SS97DbSecuritySpt
/etc/rc2.d/SS97DbSecuritySpt
/etc/rc3.d/SS97DbSecuritySpt
/etc/rc4.d/SS97DbSecuritySpt
/etc/rc5.d/SS97DbSecuritySpt
/etc/rc1.d/S99selinux
/etc/rc2.d/S99selinux
/etc/rc3.d/S99selinux
/etc/rc4.d/S99selinux
/etc/rc5.d/S99selinux
/etc/init.d/DbSecuritySpt
/etc/init.d/selinux
SOLUTION
NOTES:
Step 1
Scan your computer with your Trend Micro product and note files detected as ELF_BEIKDOR.W.
Step 2
Terminate the malware process.
- Open the Terminal. Access Applications>Accessories>Terminal or press CTRL + ALT then T.
- Type the following in the terminal:
ps –A - Look for the detected files and take note of their PIDs. Enter the following commands for each PIDs:
kill {PID}
Step 3
Remove autostart scripts. In the same Terminal, type the following command:
sudo rm -f /etc/rc1.d/SS97DbSecuritySpt
sudo rm -f /etc/rc2.d/SS97DbSecuritySpt
sudo rm -f /etc/rc3.d/SS97DbSecuritySpt
sudo rm -f /etc/rc4.d/SS97DbSecuritySpt
sudo rm -f /etc/rc5.d/SS97DbSecuritySpt
sudo rm -f /etc/init.d/DbSecuritySpt
sudo rm -f /etc/rc1.d/S99selinux
sudo rm -f /etc/rc2.d/S99selinux
sudo rm -f /etc/rc3.d/S99selinux
sudo rm -f /etc/rc4.d/S99selinux
sudo rm -f /etc/rc5.d/S99selinux
sudo rm -f /etc/init.d/selinux
Step 4
Remove dropped files. In the same Terminal, type the following command:
sudo rm -f /tmp/notify.file
sudo rm -f /tmp/gates.lock
sudo rm -f /usr/bin/bsd-port/getty.lock
sudo rm -f /usr/bin/bsd-port/udevd.lock
sudo rm -f /usr/bin/dpkgd/{module path}
sudo rm -f /tmp/moni.lock
sudo rm -f /tmp/notify.file
Step 5
Scan your computer with your Trend Micro product to delete files detected as ELF_BEIKDOR.W. 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.
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