HEUR.TROJAN.WIN32.BAYROB.GEN / Insecure Permissions

CVE Category Price Severity
Author Risk Exploitation Type Date
N/A High Remote 2021-04-30
CVSS:4.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

HEUR.TROJAN.WIN32.BAYROB.GEN / Insecure Permissions
Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: HEUR.Trojan.Win32.Bayrob.gen
Vulnerability: Insecure Permissions
Description:  The malware creates a insecure dir named "rlpzeasjvgnb" under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executables dropped by the malware to disable it or replace it with their own executable. Then wait for a privileged user to logon to the infected machine to potentially escalate privileges.
Type: PE32
MD5: 765698ccfb033c86eea6d293235d7ed0
Vuln ID: MVID-2021-0191
Dropped files: mv4aefb186aghbtwsvxglk3h.exe, btqq2r, gzjegrkpac, qaazfq
Disclosure: 04/29/2021

C:\>cacls rlpzeasjvgnb
C:\rlpzeasjvgnb BUILTIN\Administrators:(OI)(CI)(ID)F
                NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
                NT AUTHORITY\Authenticated Users:(ID)C
                NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C

C:\>dir rlpzeasjvgnb
 Volume in drive C has no label.

 Directory of C:\rlpzeasjvgnb

04/25/2021  12:21 AM                 4 btqq2r
04/25/2021  12:20 AM                 0 gzjegrkpac
04/25/2021  12:20 AM           222,208 mv4aefb186aghbtwsvxglk3h.exe
04/25/2021  12:20 AM                 6 qaazfq
               4 File(s)        222,218 bytes

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