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

Static analysis result for SHA-256 c0baec4eb2deb38c…

MALICIOUS

Office (OOXML) / .XLSX

652.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-08
MD5: d32ebf59d912022ad03be9f1a79d1622 SHA-1: 70e185fcd828497aea47489ebd84feb70ed21983 SHA-256: c0baec4eb2deb38c2f86c250a7aae50a417652429439bb5ecce82e8bac6892ef
100 Risk Score

Malware Insights

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

The sample is an OOXML 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 it's being used to deliver a malicious payload. The document body appears to be a fabricated invoice or product order, likely serving as a lure to trick users into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/IkmkAc7EQ.dDCh 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
aa41d556065b312cd67958486f658305b9025a7f7d2c477a2a7ed5eda24a1f5e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/IkmkAc7EQ.dDCh 930304 bytes
ooxml_oleobject_00_ole10native_00.bin
9bd115fa2bc3bfe46dad8c0185e8139432671e9ee10472276d79c61a99dfed70		 ole-package OOXML xl/embeddings/IkmkAc7EQ.dDCh Ole10Native stream: oLE10NAtIVe 920472 bytes

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