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

Static analysis result for SHA-256 57c8d8a165abbf39…

MALICIOUS

Office (OOXML) / .XLSX

309.5 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 1aebab33dcb37f9e5ff782be3425f753 SHA-1: 234625b0e548f482ff2ad5438c9508a04c1b6620 SHA-256: 57c8d8a165abbf392187483caa19c279ef5e880f9e7715647736d39d2cbb1fcb
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Office Open XML (OOXML) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate the exploitation of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the file is designed to leverage this vulnerability to execute a malicious payload. No document body or script content was available for further analysis, but the presence of the vulnerable OLE object is a strong indicator of malicious intent.

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
341574cdd9fc44dbd38fa3df64ff986c1454a7b396f295fedcb85762aa5e8430		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
2acc1695e825c9c2a7d2ecee087c7bb185300e54a0dccad49bd98e3bf9ee8f99		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NAtIve 1557 bytes
emf_00.emf
0b480da1f71de662b3e1dd3fc2b8bff68a25c122e07b474d56fd7f42683e27dd		 ooxml-emf OOXML EMF part: xl/media/image7.emf 1628828 bytes

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