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

Static analysis result for SHA-256 e35fd3792deb12ce…

MALICIOUS

Office (OOXML) / .XLSX

302.7 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 75cbd1e6c80f699e973336f9b1741272 SHA-1: 0ee455aee29027f8d5a91d1953ee98cb3947daaf SHA-256: e35fd3792deb12ce48ec57d019b0043965fee724b453e314ec27b0c14bd258d5
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an OOXML Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. High-confidence heuristics indicate the exploitation of CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the document is designed to leverage this vulnerability to execute a malicious payload. No document body or script content was available for further analysis, limiting the ability to identify specific IOCs or the exact nature of the 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/rights/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
7d028f1a1278df3b693177942a20b1f83130dbf184ae97156cdf16839ef8f9ee		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
2eb61571566a4987ba2176249c537d0d7ece432e24c9e56145b8d2e51309911c		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NatIvE 1579 bytes
emf_00.emf
c335e3489d39bb887f742d7700e91840a7a34c5e14c98101fbd0082bdd8d91b8		 ooxml-emf OOXML EMF part: xl/media/image6.emf 1628828 bytes

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