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

Static analysis result for SHA-256 e5c16596f19a4535…

MALICIOUS

Office (OOXML) / .XLSX

301.4 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-10-11
MD5: 9ba400f5b9ffa08c4088151206c3e37c SHA-1: 39a0e994b92bcc5268f3e243c1c5738ef9bc2b11 SHA-256: e5c16596f19a453542434e68227919861f5a504feed7b081589dfad0a7946325
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, suggesting exploitation. The embedded OLE object and EMF file are likely components of the exploit or payload delivery mechanism. No document body or script content was available for further analysis, but the presence of the Equation Editor exploit points to a malicious intent to compromise the user's system.

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
29fe96b796e056c5bb5c79be56b39ca6f5ef89355265918d4062caf3214fbfc7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
dc41ef380ba5ab3e17a32ba8dc6997e94807a4e1ddc10ff849872ca28a49a83d		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NAtIve 1716 bytes
emf_00.emf
08fa04781b1f3368c5e8a4d1d47120c10a918eb8182c3623a0269afcd4a6c035		 ooxml-emf OOXML EMF part: xl/media/image3.emf 648132 bytes

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