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

Static analysis result for SHA-256 214af8a078695f9a…

MALICIOUS

Office (OOXML) / .XLSX

627.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 184b93e364bcb6cd67c6fc1932b56225 SHA-1: 803ac9a908cbb70436bf3ea84e428170e3c6c202 SHA-256: 214af8a078695f9a68f97195f3f94d6d2551305458fdba2ace1dd1df3188408c
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet 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 size, strongly suggesting exploitation of a known vulnerability within Equation Editor to execute arbitrary code. The embedded OLE object and its anomalous Ole10Native stream are the primary indicators of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zr7.Jk1v 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
a93690e073bec220cbe293322aade9093ab348c08cc95cf5a2d2d420a94c155a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zr7.Jk1v 879616 bytes
ooxml_oleobject_00_ole10native_00.bin
3602b3f614caea3097704b833c0748e045d863ab217483856a9bf7f146997eb1		 ole-package OOXML xl/embeddings/zr7.Jk1v Ole10Native stream: oLE10NAtIVE 870168 bytes

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