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

Static analysis result for SHA-256 3074330ca9118acf…

MALICIOUS

Office (OOXML) / .XLSX

689.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 97a4581aada8b308e608f129f4b45417 SHA-1: 0fc8a88d459ad20ebe8cc81b7dbdb604927ec9e6 SHA-256: 3074330ca9118acffb12ef95b2e74564e44e4ded8a8e06a97d67a8cf252d34d2
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code, likely leading to the download and execution of a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/yP.sCk contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
a15b0ddfec9bdd8ad7d07e3be81735ab15e2bcf7be3b4c4200c35628e8afd49a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/yP.sCk 988160 bytes
ooxml_oleobject_00_ole10native_00.bin
04bd541f86f809b14b97a5e110b9d272ab15d3a356747e7dfddd790ff7ca7d6c		 ole-package OOXML xl/embeddings/yP.sCk Ole10Native stream: OLe10NATIve 977636 bytes

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