Why Task Manager - Prompt the Alerts: Behavioral Threat

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Why Task Manager - Prompt the Alerts: Behavioral Threat

L2 Linker

Dear All,

 

Do you know why the content updated, cannot open the task manager?

Cortex XDR 

            "ruleId": "bioc.masqueraded_process_msft",
            "fileIdx": 0,
            "modules": [],
            "profile": "Malware",
            "sockets": [],
            "trigger": 0,
            "moduleId": "COMPONENT_DSE",
            "policyId": "d54b10f0ce0949db97b0f8bf6bda74d9",
            "ruleName": "masqueraded_process_msft",
            "severity": 4,
            "tacticId": [
                "TA0005",
                "TA0002"
            ],
            "canUpload": 1,
            "ipBlocked": 0,
            "processes": [
                {
                    "pid": 9748,
                    "userIdx": 0,
                    "parentId": 9032,
                    "exeFileIdx": 0,
                    "instanceId": "Adp19lm1jDkAACYUAAAAAA==",
                    "terminated": 1,
                    "causalityId": "Adp19lm1jDkAACYUAAAAAA==",
                    "commandLine": "\"C:\\Windows\\system32\\taskmgr.exe\" /4",
                    "terminationReportId": "f80c05c2d9f24dda94aa8beff3ea16b8"
                }
            ],
            "terminate": 1,
            "containers": [],
            "description": "Behavioral Threat",
            "techniqueId": [
                "T1036.005"
            ],
            "postDetected": 0,
            "telemetryEdr": {
                "actors": "",
                "events": "",
                "osActors": "",
                "causalityActors": "",
                "injectingActors": ""
            },
            "eventCategory": "prevention",
            "preventionKey": "8d1a646687984b6987b7822deda5da7b",
            "scriptResults": {},
            "sourceProcess": {
                "md5": "94ae29b49447daae37e07fd2264bb34b",
                "pid": 9748,
                "user": {
                    "userName": "",
                    "domainUser": "",
                    "userDomain": ""
                },
                "sha256": "78a68d19ef89ef39b26a85d5948d3a5051568674e2a4842ba10e3ddcb68eee6e",
                "signers": [
                    "Microsoft Corporation"
                ],
                "userIdx": 0,
                "version": "10.0.19041.4123 (WinBuild.160101.0800)",
                "fileName": "Taskmgr.exe",
                "fileSize": "1214904",
                "parentId": 9032,
                "exeFileIdx": 0,
                "instanceId": "Adp19lm1jDkAACYUAAAAAA==",
                "terminated": 1,
                "causalityId": "Adp19lm1jDkAACYUAAAAAA==",
                "commandLine": "\"C:\\Windows\\system32\\taskmgr.exe\" /4",
                "companyName": "Microsoft Corporation",
                "rawFullPath": "C:\\Windows\\System32\\Taskmgr.exe",
                "versionCopyright": "© Microsoft Corporation. All rights reserved.",
                "versionDescription": "Task Manager",
                "terminationReportId": "f80c05c2d9f24dda94aa8beff3ea16b8",
                "versionInternalName": "Task Manager",
                "versionOriginalName": "Taskmgr.exe"

1 accepted solution

Accepted Solutions

L2 Linker

Finally, the support replies us that the taskmgr.exe was verified to be false positive and will be fixed in Content Update version 1300.
The workaround solution needs to create the BTP alert exception.

View solution in original post

6 REPLIES 6

L2 Linker

This only happens on the Content# 1290-79447

Today on 1290-79846

L0 Member

We started having this issue today after the latest content release 1290-79846

L2 Linker

Finally, the support replies us that the taskmgr.exe was verified to be false positive and will be fixed in Content Update version 1300.
The workaround solution needs to create the BTP alert exception.

Hi @JamesChim is this fixed? we have an exception, shall we delete it now?

The issue fixed on the content version, and we can delete the workaround on exception

  • 1 accepted solution
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  • 6 replies
  • 1 Likes
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