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

Static analysis result for SHA-256 679d1f6452399799…

MALICIOUS

Office (OOXML) / .XLSX

629.4 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-15
MD5: a779c3bd64720553b1ca27e25e444ab7 SHA-1: 38f6516a26b28bd045e249fe0821cc1e98cd2cca SHA-256: 679d1f6452399799e2bb70cdccef8605660c92ac0f0be8380b57223caf1a7e51
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vSSPgcv.q7re 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
19a0720664f26f296ff773f9ef1cabc68db0da9a2865c3e857173c3bf6921451		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vSSPgcv.q7re 844288 bytes
ooxml_oleobject_00_ole10native_00.bin
a09a0842fbe11ae2658ed8abf817868b42dc3941cd0709fe9dc606ee1ec92215		 ole-package OOXML xl/embeddings/vSSPgcv.q7re Ole10Native stream: Ole10naTivE 835500 bytes

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