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

Static analysis result for SHA-256 f7f7eef1335e813a…

MALICIOUS

Office (OOXML) / .XLSX

635.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-23
MD5: 50d4c5006d1abef317feb283d0baf2ac SHA-1: 0afc1dc445d3896f75e29b62a4fdba8e06a5fe3c SHA-256: f7f7eef1335e813a234c7bfa0122c9865ef55f8655082fa9cf4e295fb4b58981
100 Risk Score

Malware Insights

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

The sample is an Office document 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 size and entropy, strongly suggesting it's being used to deliver a secondary exploit or payload. The document body content appears to be a business invoice, likely a lure to disguise the malicious nature of the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gj1V0sb4.4NqIc 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
f75e42a90438564d05ae00dcaf802d33f8025441983d42a48a91a5019401ddbb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gj1V0sb4.4NqIc 905728 bytes
ooxml_oleobject_00_ole10native_00.bin
247a817a286a6bee38e4aa42afae21a96c8e7271cbd4cac452744f2678afeb48		 ole-package OOXML xl/embeddings/gj1V0sb4.4NqIc Ole10Native stream: ole10NAtIve 896167 bytes

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