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

Static analysis result for SHA-256 84c5539043d6fdcb…

MALICIOUS

Office (OOXML) / .XLSX

689.8 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-10
MD5: f6f92541ffc2d5ab7101bc9e5a29058f SHA-1: b77f1a90d300f055b28e1a05b7357702b1887f5a SHA-256: 84c5539043d6fdcb0560504e4f611b94fa24facbd491d6327c11a6bbe579a875
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet 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, suggesting it's being used to deliver a secondary exploit or payload. The document body appears to be a fabricated financial or shipping document, likely intended to lure the user into opening the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rbZ2.SK37k3T 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
251c7c4d6093d6555aa6ce2644f736361aaadda247a932a95a65c187820414db		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rbZ2.SK37k3T 986112 bytes
ooxml_oleobject_00_ole10native_00.bin
0ccc33805c7c2fcc84479653b8770904a94ab2743a40c3b33aa5c85dc41e724e		 ole-package OOXML xl/embeddings/rbZ2.SK37k3T Ole10Native stream: olE10naTiVe 975523 bytes

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