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

Static analysis result for SHA-256 07d16a7b4766cda6…

MALICIOUS

Office (OOXML) / .XLSX

2.93 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 0379192f18c37c2ba107606e20d42efc SHA-1: e2905c624fbd027d0de5f7fdea65c086590bc0a9 SHA-256: 07d16a7b4766cda66028f363161111b77ff3e2efa6b5898ce533dd6144eda829
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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 contains a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique allows for arbitrary code execution on the victim's machine.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/e7lWMx.QB9E 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
8897ee9371abcd58b3efb54d8e8ca79274b0ed6de9a3755014361115a213b215		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/e7lWMx.QB9E 3047936 bytes
ooxml_oleobject_00_ole10native_00.bin
0924c937cbcec58090f9bafd5a5a738438f1b0576954a96f7b6b882968460a02		 ole-package OOXML xl/embeddings/e7lWMx.QB9E Ole10Native stream: olE10nATiVE 3021368 bytes

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