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

Static analysis result for SHA-256 62c4b0f2f1d004ad…

MALICIOUS

Office (OOXML) / .XLSX

593.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-10
MD5: fef7f1d1742a596336b04a856d7ba170 SHA-1: 9ae59101b23b7b0b1c5a5b9234e570820da1f07e SHA-256: 62c4b0f2f1d004ada278cfc7be3a1d3754ceebaef53754cf91d6840f80c89d62
100 Risk Score

Malware Insights

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

The file is an Office 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, 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/FsvQh.Ln 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
ee34a3879d065b9fba26f39338f775b870c18ba81295604ef08a079a1a9917ab		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FsvQh.Ln 894976 bytes
ooxml_oleobject_00_ole10native_00.bin
bca568752ca209b7adab2ec75074d5f40ea792e63d8f8775902edcfa22b5fbc5		 ole-package OOXML xl/embeddings/FsvQh.Ln Ole10Native stream: oLe10naTIVE 885489 bytes

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