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

Static analysis result for SHA-256 a0c8bbdd44ce4987…

MALICIOUS

Office (OOXML) / .XLSX

759.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-02
MD5: 0045374eabcc2f9947a4d34ccd5fe1d0 SHA-1: e360261c380f671bf895c15b088bd121215b9d18 SHA-256: a0c8bbdd44ce4987dc06a715d67ec3370182418f924fbec1c35970efddda839a
100 Risk Score

Malware Insights

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

The sample is an Office 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 and size discrepancy, strongly suggesting exploitation. The embedded OLE object and its anomalous stream are the primary indicators of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VI4CYgPta.qwj 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
e4772a5f1bd76416f9ac3a2e2f49f91e8e3969622a8204e9cc01178e84bf0039		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VI4CYgPta.qwj 1056256 bytes
ooxml_oleobject_00_ole10native_00.bin
3405450a6bf9f9c6a0c454f2efadfd9ee34b5df73eaaad2b28df2f61d753acd1		 ole-package OOXML xl/embeddings/VI4CYgPta.qwj Ole10Native stream: olE10NAtIvE 1045383 bytes

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