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

Static analysis result for SHA-256 a049ab7268bbc638…

MALICIOUS

Office (OOXML) / .XLSX

323.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-09-17
MD5: 1c0e4ff90648d268163d480f1e451b1b SHA-1: 61c141c53acf89ee7495237d23792772d58ae90a SHA-256: a049ab7268bbc638b478cba3b798a446195a979c900480ec610ffac49cf4021a
110 Risk Score

Malware Insights

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

The sample contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object, which is known to be vulnerable. Heuristics indicate CVE-2018-0798, an anomaly within the Equation Editor's native stream, is present. This suggests the file is designed to exploit this vulnerability, likely leading to the download and execution of a secondary payload. No document body text or scripts were extracted, limiting further analysis of the immediate payload.

Heuristics 5

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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://www.day.com/dam/1.0
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/tiff/1.0/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
a0cbba9dd76842d70e8879ddd5571423d3ae5f781334f8f260d4b3db87ac4959		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
2d41498adbf6be336cc762a2479ec67c36e8abb4d9ce08bd81f5d7e61148e5e7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NatIVe 1523 bytes
emf_00.emf
4926e69f189ca325ec00c2c1760c8ce0e417361d5b292af73efb67bcc1fe4dc5		 ooxml-emf OOXML EMF part: xl/media/image2.emf 648132 bytes

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