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

Static analysis result for SHA-256 a6d00f12e2627480…

MALICIOUS

Office (OOXML) / .XLSX

620.1 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-29
MD5: fe30a320b140c66230ba9a5a5c133221 SHA-1: 00efa987502e035e564e8106bb068c0b9fce542d SHA-256: a6d00f12e26274804c03c929cbbf33d45fb265c86863e9960fc161f25cc82745
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an Excel file containing an embedded OLE object, specifically identified as an 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 of a known Equation Editor vulnerability (e.g., CVE-2017-11882). This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ZvKqZ.zcK2KO 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
b8358b83c9733501ca7fcc8570d15a5b23642fd1ab7ece143b538fb98f5a28a0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ZvKqZ.zcK2KO 873984 bytes
ooxml_oleobject_00_ole10native_00.bin
5bfacffe376f966df865aef6b109b3387192851ea77764449749f5b32312a354		 ole-package OOXML xl/embeddings/ZvKqZ.zcK2KO Ole10Native stream: oLe10NAtIVe 864281 bytes

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