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

Static analysis result for SHA-256 e918197fae3f8dfa…

MALICIOUS

Office (OOXML) / .XLSX

702.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-02-17
MD5: d1c7e9c5c6380679430dfc7897c76c6a SHA-1: baa5c10685def6b971bfd8455051ab4df62b2a57 SHA-256: e918197fae3f8dfa76d937e4bd9eff85be2171f6d5459467a1818a2438baf677
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an OOXML 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 and size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. The document body text appears to be a business-related order or invoice, likely a lure to encourage opening the malicious object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Av2izs39.pbelOUR 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
fd9b4f7e38bc67d19abe12037f90000d12b7c178fb11b3839081f175ad40f453		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Av2izs39.pbelOUR 993792 bytes
ooxml_oleobject_00_ole10native_00.bin
22e0843ecf85bad4de40b2c808b9ad49c255f92236f6c6ff3be2eefd58d0f88b		 ole-package OOXML xl/embeddings/Av2izs39.pbelOUR Ole10Native stream: OLe10naTIVE 983552 bytes

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