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

Static analysis result for SHA-256 bfac80afb2bf2797…

MALICIOUS

Office (OOXML) / .XLSX

638.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-14
MD5: bc12bf54843cab4b6df5247c4c0e4299 SHA-1: 28afc85ea4d3b86d4a0cc51376a6af4f40422ed3 SHA-256: bfac80afb2bf2797ce9829ada704a87ed07942123f3edcb71e34ab6a1673e275
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a vulnerability within the Equation Editor component. The presence of this anomalous OLE object is the primary indicator of malicious intent, likely to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dn.u4 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
0470efaa1957571ae7969482b14ef316938649bc9cc2f49bd1890349aed078f1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dn.u4 869888 bytes
ooxml_oleobject_00_ole10native_00.bin
be181b61064dfb5ddb069ce2776821ae44cb25b73aa715f4019e98d59f1bc006		 ole-package OOXML xl/embeddings/dn.u4 Ole10Native stream: OlE10Native 860434 bytes

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