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

Static analysis result for SHA-256 b9b0f6ef13ce230a…

MALICIOUS

Office (OOXML) / .XLSX

679.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-02
MD5: 5895bbc168f0d598425878922b54c017 SHA-1: 613f1b969b3a75f53b31370e4ed5ddc7e48f46a1 SHA-256: b9b0f6ef13ce230a831c4b96cb761616d45ec16b95dbf3a08fcc5f4b10f7e56b
100 Risk Score

Malware Insights

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

The sample is an OOXML document 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, suggesting it's being used to deliver malicious content. The presence of this exploit within the document points to an attack pattern aimed at exploiting software vulnerabilities for initial compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ZK8dm.LPX 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
18e4aa68bc3320e9d7932588eb74657a19322f6591646fcda6203f83e552bfd6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ZK8dm.LPX 954368 bytes
ooxml_oleobject_00_ole10native_00.bin
ac7251b9229eb7ad28612d4bdb20ca539882f07b743c9273c1f8c4ee0a90d54e		 ole-package OOXML xl/embeddings/ZK8dm.LPX Ole10Native stream: Ole10NATiVe 944562 bytes

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