BackDoor.IRC.Medusa.1

SHA1

a5a935f887e325db9d1884ef34632365ce8102c6

An IRC bot that receives commands over the IRC (Internet Relay Chat) protocol. It is designed to carry out mass DDoS attacks. The examined sample is obfuscated with five various methods in order to complicate its analysis. Once launched, it checks whether the following applications are present in the system:

vmtoolsd
dumpcap
SandboxieDcomLaunch
smsniff
NetworkTrafficView
DNSQuerySniffer
TcpLogView
HTTPNetworkSniffer
Fiddler
Wireshark
OLLYDBG
dnSpy

Once the Trojan is installed, it changes the Windows registry branch to autorun itself:

<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Audio Control Emulation' = '%APPDATA%\Audio Emulation System.exe'

The Trojan сontains the following strings:

httpseebix
httpstrong
runtor
changetor
lolddosrekt
httpactive
httppost
icmp
silent
udp
syn
stop
list
smartflood
httpssl
stop-all
download
uninstall
proactive list
proactive off
proactive on
botkill
listusers
listadmins
remove
part
help
version
join
sort
update
resetnick
login

A list of directives the Trojan performs is given in the bot operator manual created by the cybercriminals:

News about the Trojan

Curing recommendations

If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.

Free trial

Download Dr.Web

Download by serial number

Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

Free trial

Download Dr.Web

Download by serial number

Download on App Store

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

Free trial

Download Dr.Web

Download by serial number

If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
- Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
- Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
- Switch off your device and turn it on as normal.

Technologies

Terminology

Training and education

Myths

SHA1

Curing recommendations

Free trial