Backdoor.Linux.YOWAI.A
ELF/Mirai.AE!tr (Fortinet)
Linux
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
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.
It listens on port(s). It executes commands from a remote malicious user, effectively compromising the affected system.
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.
Backdoor Routine
This Backdoor listens on the following port(s):
- 6
It executes the following commands from a remote malicious user:
- Download a file
- Performs various DDOS attacks
- Execute shell commands
- Uses default or easy-to-guess usernames and passwords to login to other devices
Other Details
This Backdoor does the following:
- It may spread to other devices by taking advantage of the following vulnerabilities:
- CVE-2018-10561
- CVE-2014-8361
- ThinkPHP exploit
- Linksys Remote Code Execution
- CCTV-DVR Remote Code Execution
- It uses the following credentials to try to login to other devices:
- OxhlwSG8
- tlJwpbo6
- S2fGqNFs
- admin
- daemon
- 12345
- support
- 4321
- default
- vizxv
- t0talc0ntr0l4!
- synnet
- root
- It displays the strings below once executed in the command line:
- Yowai: Raping you sorry
- It is capable of terminating processes which satisfies any of the following conditions:
- memory of the process contains strings related to the following botnets:
- dvrhelper
- mirai
- light
- apex
- Tsunami
- hoho
- nikki
- miori
- hybrid
- sora
- yakuza
- kalon
- owari
- gemini
- lessie
- senpai
- apollo
- storm
- Voltage
- horizon
- meraki
- ice
- Cayosin
- Mafia
- Helios
- Sentinel
- Furasshu
- love
- oblivion
- lzrd
- yagi
- dark
- blade
- messiah
- qbot
- modz
- ethereal
- unix
- execution
- galaxy
- kwari
- okane
- osiris
- naku
- demon
- sythe
- xova
- trinity
- BUSHIDO
- IZ1H9
- daddyl33t
- KOWAI-SAD
- ggtr
- QBotBladeSPOOKY
- SO190Ij1X
- hellsgate
- sysupdater
- Katrina32
- The files downloaded are saved as:
- /tmp/Yowai.mips (CVE-2014-8361)
- /tmp/Yowai.mpsl (Linksys Remote Code Execution)
- /tmp/gaf (CVE-2018-10561)
- /tmp/Yowaib (ThinkPHP exploit)
- Once a vulnerable device is exploited, it will download and execute a file in the device from the following websites:
- http://{BLOCKED}.{BLOCKED}.25.221/bins/Yowai.mips (CVE-2014-8361)
- http://{BLOCKED}.{BLOCKED}.25.221/bins/Yowai.mpsl (Linksys Remote Code Execution)
- http://{BLOCKED}.{BLOCKED}.25.221/bin (CVE-2018-10561)
- http://{BLOCKED}.{BLOCKED}.25.221/bins/Yowai.x86 (ThinkPHP exploit)
SOLUTION
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.YOWAI.A. 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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