Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 aa26ed65b5b05b28…

MALICIOUS

Office (OOXML) / .DOC

319.8 KB Created: 2022-07-22 09:38:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2022-08-01
MD5: 8abea2d6c14af54c6eac09d158554085 SHA-1: 3802d9c8b3530fe7b140cbd4a12c3895c46077b2 SHA-256: aa26ed65b5b05b28fa8c56df8c0d87e6bfd8b98f962824293acce14d03cd3412
162 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: User Execution T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1566.002 Phishing: Spearphishing Link

The file is identified as malicious due to critical heuristic firings related to CVE-2021-40444, indicating the exploitation of a known vulnerability in Office documents. The embedded external relationship points to 'http://polpharmar.com/test.html!x-usc:http://polpharmar.com/test.html', which is likely the source of the malicious payload. The document body itself contains seemingly legitimate invoice-like text, which is a common lure to trick users into opening and interacting with malicious documents.

Heuristics 4

  • External OLEObject gadget — CVE-2021-40444 critical CVE exact CVE_2021_40444
    External relationship to mhtml:http://polpharmar.com/test.html!x-usc:http://polpharmar.com/test.html — exploitable external OLEObject gadget pattern for CVE-2021-40444
  • ClamAV: Doc.Exploit.CVE_2021_40444-9891528-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2021_40444-9891528-0
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/document.xml.rels: mhtml:http://polpharmar.com/test.html!x-usc:http://polpharmar.com/test.html
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://polpharmar.com/test.html!x-usc:http://polpharmar.com/test.html
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

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