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

Static analysis result for SHA-256 07a61eb2192f7729…

MALICIOUS

Office (OOXML) / .XLSX

374.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-09-29
MD5: 60d2bbf4fe52db0f98575a6fe5a9eea8 SHA-1: 4ea33f7fb1bd425116810a984958182dfae38eeb SHA-256: 07a61eb2192f7729b1468771d4842d995c895109e1501928923c427643b1b9ec
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel file containing an embedded Equation Editor OLE object, which is known to be vulnerable to CVE-2018-0798. This vulnerability allows for arbitrary code execution when the object is processed. The presence of an embedded OLE object and the specific CVE firing strongly indicate an exploitation attempt.

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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
ca81dcfef0fe4e3f4f3b661ae37549edd4c9becdeabdf3c9c185331c794f6d90		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
8b22f4368eb9263d0c39fbbbc328af39ae71a0633ca1151a862140f2b00029bf		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NATive 1943 bytes
ooxml_oleobject_01.bin
99afa3185b1a952b13323cb1518e187938fb2c07b717d5b757d3f160d43ef7d4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 122515 bytes
emf_00.emf
2e1c534e56ed3a4b4b381eaf92164cd2ebf063f7dace429df93c269444ad74cb		 ooxml-emf OOXML EMF part: xl/media/image4.emf 648132 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.