Backdoor.Linux.XORDDOS.AE
HEUR:Trojan-DDoS.Linux.Agent.g (Kaspersky), ELF:Xorddos-AD [Trj] (Avast)
Linux
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
253,312 bytes
ELF
Yes
04 Jun 2020
Drops files, Connects to URLs/IPs
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 copies of itself into the affected system:
- /lib/libudev.so
- /usr/bin/{random}
Autostart Technique
This Backdoor drops the following files:
- /etc/cron.hourly/gcc4.sh (Cron is a time-based job scheduler in Unix-like computer operating systems)
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- Execute files
- Download files
- Update Malware
- Delete Files
- Terminate Process
- Remove Services
- Remove Self
- Perform DDoS attack
- Hide Files
- Create Services
- Create Directory
- Hide Port
- Copy Files
It posts the following information to its command and control (C&C) server:
- {BLOCKED}.{BLOCKED}.9.228:53
Information Theft
This Backdoor gathers the following data:
- Memory Information
- CPU Information
- Network Speed
- PID of Running Process
- MD5 of Running Process
Other Details
This Backdoor does the following:
- Drops a shell script in /etc/init.d/{random characters} folder which setups the auto-start mechanism of the malware.
- Creates symbolic links which points to the script in /etc/init.d/{random characters}:
- /etc/rc{1-5}.d/S90{random numbers}
- /etc/rc.d/rc{1-5}.d/S90{random numbers}
- Read the following from its configuration file:
- md5 - checksum of file
- denyip - open communication with an IP
- filename - list of filename
- rmfile - files to remove
- Uses the following User Agents:
- POST/GET %s HTTP/1.1 /
Accept: */*
Accept-Language: zh-cn
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; TencentTraveler ;.NET CLR 1.1.4322)
Connection: Keep-Alive
Host:
Content-Type: application/x-www-form-urlencoded
- POST/GET %s HTTP/1.1 /
- Get the magic string value from the file /var/run/gcc.pid
- It modify /bin/chkconfig to add its copy as a service.
SOLUTION
9.850
15.910.04
04 Jun 2020
15.911.00
05 Jun 2020
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.XORDDOS.AE. 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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