Windows 10: New FaxMail Received 27/04. Is it Malware?

Heidi Pan · Apr 27, 2021

New FaxMail Received 27/04. Is it Malware?

:)

Le Boule · Apr 27, 2021

Malware Detected

If this is what you are seeing suggest you follow all
ofthe steps listed in this removal guide:
https://www.bleepingcomputer.com/virus-removal/remove-the-requested-resource-is-in-use-error/

Other scanners that may help resolve this malware issue are listed in
List of Malware Removal Tools

Regards…

Top 10 Ways PUPs Sneak Onto Your Computer. And How To Avoid Them. | Emsisoft | Security Blog

Brink · Apr 27, 2021

Microsoft Advanced Threat Analytics - NotPetya malware

On June 27, 2017 reports on a new variant of Petya (which was later referred to as NotPetya) malware infection began spreading across the globe. It seems the malware’s initial infection delivered via the “M.E.doc” update service, a Ukrainian finance application. Based on our investigation so far, the propagation steps executed by the malware can be considered sophisticated and well tested.The malware distributes itself as a DLL file, spreading over internal networks using different lateral movement techniques.

This blog post focuses on the network behavior analysis of NotPetya and the techniques it uses to propagate in the network. This is ongoing research, and we’ll update with additional findings as those become available.

Malware Propagation Flows

Delivery & Initial execution

The malware is delivered via the “M.E.doc” service to infect the first endpoint.

The malware executes and extracts the relevant components to disk. These include:

PsExec – Network remote execution tool.

A credential dumping tool.

More information on these steps can be found at the Windows Security blog.

Reconnaissance

The internal network is probed using multiple discovery methods to identify new workstations and domain controllers. These include:

LANMAN NetServerEnum2 API used to get information about workstations and domain controllers.

Probing using ports 139 and 445 to other endpoints.

If a domain controller is accessible, the malware queries its DHCP Service to enumerate DHCP subnet.

In case DHCP subnets are discovered, the malware will continue its discovery against those subnets as well.

Reconnaissance example – NetServerEnum2

In the screenshot above, we can see the NetServerEnum2 API used by the infected machine.

The response includes the domain controller and a list of all known workstations response.

Lateral Movement

To spread itself on the network, the malware tries to access the administrative share ($admin).

If the SeDebugPrivilege privilege obtained (Step2), a credentials dumping tool is used to recover additional user credentials from the local memory.

Our lab tests have shown that in addition to the current account session, only one additional user is used by the malware to probe the remote hosts. The malware seems to ignore memory dumped users who were tagged under a new credentials session. Moreover, it seems like only one user (the last one who is in memory) is used to probe the destination host

Each target endpoint is accessed using multiple authentication protocols, such as NTLM and Kerberos over GSSAPI (SPNEGO). The credentials used for access are:

Current user context, under which the malware is running.

Successfully dumped credentials (if available).

In the screenshot below, we can see multiple CIFS ticket requests performed by the malware on behalf of the dumped user. Such broad abnormal access attempts performed by the malware will be detected by Microsoft Advanced Threat Analytics’ (ATA) abnormal behavior detection. Based on previously learned user behavior analytics, the detection mechanism will recognize and alert on the abnormal resource access performed by the malware using the compromised credentials.

Multiple TGS-REQ

In the screenshot above, we can see multiple CIFS ticket requests.

Example of abnormal user access – ATA

Remote Execution

If access to the administrative share was obtained, the malware copies itself to the target host and executes PSEXEC and WMIC.

Malware Copy

PSEXEC Service creation

In the screenshot above, the infected host starts executing the PSEXEC tool.

Exploitation (optional)

If all propagation steps failed, the malware tries to execute one of the SMB exploits (MS17-010).

Available SMB Exploits:

EternalBlue – CVE-2017-0144

EternalRomance – CVE-2017-0145

The above steps are performed simultaneously, using multiple threads and runs against each target host. For further information regarding the SMB exploit mitigation, malware encryption steps and initial infection stage, please refer to the Petya worm capabilities blog post.

The spreading capabilities used by the NotPetya malware introduce a new level of sophistication when executing lateral movement.

Detection and mitigation

Microsoft Advanced Threat Analytics allows customers to detect and to investigate a variety of advanced techniques including the lateral movement technique used by NotPetya.

This type of lateral movement can be detected by ATA as abnormal resource access – given the large scanning performed by the user to attempt access additional endpoints on the subnet.

There are several ways customers can detect and prevent NotPetya from impacting their environment.

First, we strongly recommend customers that have not yet installed security update MS17-010 to do so as soon as possible. If applying the patch is not possible, disable SMB V1 on the corporate networks.

Second, we recommend that you verify good credential hygiene. To learn more, read the following article about protecting high value assets with secure admin workstations.

Additional Resources

KB

MS17-010 Security Update

Blog

New ransomware, old techniques: Petya adds worm capabilities

Windows 10 platform resilience against the Petya ransomware attack

Click to expand...

Source: Advanced Threat Analytics security research network technical analysis: NotPetya Microsoft Secure

Le Boule · Apr 27, 2021

Malware???

Any new browser extensions that need to be disabled/removed?

Did you empty temporary internet files, restart the computer and then run a Quick Scan with Windows Defender?

You may want to scan with the Emsisoft Emergency Kit How to find and clean malware infections with Emsisoft Emergency Kit | Emsisoft | Security Blog Other
free scanners that may help with this issue are listed in List
of Malware Removal Tools

Is this what you are referring to? Remove "Ads by Chocolate Bar" virus (Removal Guide)
If so and you cannot resolve the issue, suggest follow all steps on the Malwaretips Guide to include resetting your browsers.

Reset Internet Explorer to default settings (Step-by-Step Guide)

Reset Google Chrome to default settings (Complete Guide)

Reset Mozilla Firefox to default settings (Step-by-Step Guide)

http://www.howtogeek.com/237527/how-to-reset-microsoft-edge-in-windows-10/

Regards...

Top 10 Ways PUPs Sneak Onto Your Computer. And How To Avoid Them. | Emsisoft | Security Blog

Windows 10: New FaxMail Received 27/04. Is it Malware?

New FaxMail Received 27/04. Is it Malware?

New FaxMail Received 27/04. Is it Malware?

New FaxMail Received 27/04. Is it Malware?

New FaxMail Received 27/04. Is it Malware? - Similar Threads - FaxMail Received Malware

New malware? Scared!

New malware? Scared!

How to remove NEW Malware?

How to remove NEW Malware?

How to remove NEW Malware?

Possibly new Malware found

Possibly new Malware found

SLUI 04

New LG Monitor (27 UK850-W 27") Coming: Sr. Citizen With Quest's On