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

Static analysis result for SHA-256 5eae721394252585…

MALICIOUS

Office (OOXML) / .XLSX

635.9 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000
MD5: 46936492cc4157abc150faeddc594eff SHA-1: 658854f49bd691fc4bfae6e79b33cad18c08abf3 SHA-256: 5eae721394252585f6a5d8eb5ad6f5c2d88c748daa5e5b0841d8ed173d1bd18b
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate that this object carries a payload-like stream with an anomalous header and a significantly larger declared size than the actual stream size, strongly suggesting it's designed to exploit a vulnerability or deliver a secondary payload. The document body content appears to be financial data, likely a lure.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/p9PMzXpb.beHo 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
21c190ca537c5e0e7a96d25345070bdd3749c719540739ac09bd95e4af744081		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/p9PMzXpb.beHo 885760 bytes
ooxml_oleobject_00_ole10native_00.bin
fbfdebca3390c8e994f08f994059d439230e115da4340fa2737848ac5e35876c		 ole-package OOXML xl/embeddings/p9PMzXpb.beHo Ole10Native stream: OlE10NaTIvE 876205 bytes

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