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

Static analysis result for SHA-256 86de4fc7ee4f19a2…

MALICIOUS

Office (OOXML) / .XLSX

677.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-05-04
MD5: b0a77683493f0d361dedfd56fcbc380d SHA-1: 7086accccf9b70eecc297ee4542f115955d0b3cc SHA-256: 86de4fc7ee4f19a269f69ce6170e161f67708e0b142c94b844983bd41ddb5287
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Office document containing an embedded OLE object, identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to execute malicious code. The document body itself appears to be a purchase order, likely a lure to disguise the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/kowX.5gqkF 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
60952c3d33fa696e710329aac4668d8841a26c7bf4f28faec145a391cce9cd22		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/kowX.5gqkF 936448 bytes
ooxml_oleobject_00_ole10native_00.bin
a844826721ccf95c19c73ba6d573d26e1c8371d46b2c183a1c0cb43767de55f7		 ole-package OOXML xl/embeddings/kowX.5gqkF Ole10Native stream: oLE10naTivE 926254 bytes

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