Tuesday, May 18, 2021

Backdoor.Win32.Delf.abb Insecure Transit

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/2910c3bea6732d5ed81a7c44d4354136.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Delf.abb
Vulnerability: Insecure Transit
Description: The malware listens on TCP ports 1988 and 2111 but message exchange takes place on port 1988. The backdoor uses unencrypted plaintext socket communication allowing anyone who can sniff network traffic to read any communications sent or retrieved. This can disclose information to third-party well positioned attackers.
Type: PE32
MD5: 2910c3bea6732d5ed81a7c44d4354136
Vuln ID: MVID-2021-0206
Disclosure: 05/14/2021

Exploit/PoC:
Use Wireshark to sniff communications.

0000 00 XX XX XX XX XX 00 XX XX XX XX XX 08 00 45 00 ..).yq..)R....E.
0010 00 33 e1 e7 40 00 80 06 00 00 c0 a8 12 82 c0 a8 [email protected]
0020 12 7f 69 ae 07 c4 1e 07 2a e1 22 b1 03 c1 50 18 ..i.....*."...P.
0030 20 14 a6 77 00 00 49 20 68 61 74 65 20 79 6f 75 ..w..I hate you
0040 0a

0000 00 XX XX XX XX XX 00 XX XX XX XX XX 08 00 45 00 ..)R....).yq..E.
0010 00 43 06 e9 40 00 80 06 4d 7a c0 a8 12 7f c0 a8 [email protected]
0020 12 82 07 c4 69 ae 22 b1 03 c1 1e 07 2a ec 50 18 ....i.".....*.P.
0030 08 05 7e 4d 00 00 3c 53 65 72 76 65 72 3e 20 49 ..~M..<Server> I
0040 20 68 61 74 65 20 79 6f 75 20 6d 6f 72 65 21 21 hate you more!!
0050 21 !


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