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

Static analysis result for SHA-256 7063cae2c0ec4db8…

MALICIOUS

Office (OOXML) / .XLSX

747.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-08
MD5: cf9780f74aa9a71ab02b97636a90fd07 SHA-1: 3dcd42e5a73ccf2f2a6783e6d0f219914e0f13b0 SHA-256: 7063cae2c0ec4db86192b42174ac31a7503720627034acd2329430a2d0a18508
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation. This technique is commonly used to deliver secondary malware payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8W.Cuas 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
aadcc1d83d26f458c466fddd698598702edc1d8d6d6b00a0c6fc2ddd1f4173ce		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8W.Cuas 1089024 bytes
ooxml_oleobject_00_ole10native_00.bin
c322fba70e2518f1d2fe61c9daae5f7561132cf0c8ffd42aafae19cf77bf70de		 ole-package OOXML xl/embeddings/8W.Cuas Ole10Native stream: OlE10nATIvE 1077820 bytes

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