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

Static analysis result for SHA-256 745e2b871150deee…

MALICIOUS

Office (OOXML) / .XLSX

668.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-07-29
MD5: 497e66dd04015542df5cfedc352bbdca SHA-1: 71caeb815dfa80da8341c9b3af35698ac4709fb5 SHA-256: 745e2b871150deeec902103ea552dd846f6e9221b0586b4e406518cb6755e7fc
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model and Distributed Component Object Model: Component Object Model T1204.002 Malicious File: User Execution: Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity 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 like CVE-2017-11882. The document body, formatted as a purchase order, serves as a lure to encourage user interaction with the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/eU.ZMQ7t 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
78f32f639e04bc1fea8aa721192b235d5136de0c94db4e5e6d0d032a96f172c3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/eU.ZMQ7t 903168 bytes
ooxml_oleobject_00_ole10native_00.bin
67f71bc9e71d07b7f96648d1e37ebd055fc06e25dc4de3e20466b8c5ea3c6fb8		 ole-package OOXML xl/embeddings/eU.ZMQ7t Ole10Native stream: olE10natIVE 893870 bytes

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