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

Static analysis result for SHA-256 479f55996a9935f6…

MALICIOUS

Office (OOXML) / .XLSX

669.7 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-14
MD5: 8049afafafd5b9bf044a93e5c95406cc SHA-1: b966b6f97413402ac1d8b4d9e410ce5d16124eed SHA-256: 479f55996a9935f6f5cbefc28723cd67cf3591f7d4ecc50d817d957213fc65a4
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This pattern is commonly associated with the delivery of malicious content via weaponized documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/g395.KYXk4 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
d7e2697da67b9b3d0ddb8c0cfca417c37f5765c8a74ea42f483addbd2aee9698		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/g395.KYXk4 934912 bytes
ooxml_oleobject_00_ole10native_00.bin
477d04e04baf5a9cbe0110f7d9a4f9056647aa522811b38b998ecb4f5cd8cf3e		 ole-package OOXML xl/embeddings/g395.KYXk4 Ole10Native stream: OlE10NatIVe 924780 bytes

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