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

Static analysis result for SHA-256 3f8f67f010d16691…

MALICIOUS

Office (OOXML) / .XLSX

673.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-28
MD5: a74e17c1430d6b13ad8e4697fac32512 SHA-1: 9253badfd081c1a1c90de9c02e1d29343ca2bf6d SHA-256: 3f8f67f010d16691581cbc52474e5e2c7a2d0c025c46bc3c4743671446d7f977
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting it's a dropper for malicious content. The document body itself is formatted as a purchase order, likely a lure to encourage interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/adId.Qt5fk 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
7c243f70a460cd679059d141310d6213fc44d382b8f2c6b5551c277dbd787517		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/adId.Qt5fk 926720 bytes
ooxml_oleobject_00_ole10native_00.bin
8e8ee611939d8068fa668bccbb608625525f79657fd9d7c4b1d9315f1312fbe7		 ole-package OOXML xl/embeddings/adId.Qt5fk Ole10Native stream: oLe10NaTiVE 916586 bytes

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