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

Static analysis result for SHA-256 b1dfb4c85cf5cf24…

MALICIOUS

Office (OOXML) / .XLSX

643.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-11
MD5: 62f0c80d826e3333c9d30801ae7813bd SHA-1: b49e04714b128e0a1569c1323653c67755fb3d60 SHA-256: b1dfb4c85cf5cf2424acc1d7745bdd95b0fb3751fcbb9f0d07b91195667984c5
100 Risk Score

Malware Insights

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

The file is an Excel document 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 size and entropy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lEfTfV.oP3Iknf 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
b3ae711c5d4deb717b206a1f7305d85ed59fe2812f2d779cdb25881740612f35		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lEfTfV.oP3Iknf 914432 bytes
ooxml_oleobject_00_ole10native_00.bin
55215f281e50369ada04bfa96c9bf2de8ebabb36f4fd173c3d3b0a4cf61d1a8b		 ole-package OOXML xl/embeddings/lEfTfV.oP3Iknf Ole10Native stream: olE10NatIVE 904885 bytes

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