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

Static analysis result for SHA-256 3bb5af138221510e…

MALICIOUS

Office (OOXML) / .XLSX

740.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-07-26
MD5: 06c8da5a548939b1a9e19416966d2048 SHA-1: 52a4ec414f9a08afe45378cae817c1a75c5905aa SHA-256: 3bb5af138221510e76cc45971465ebdd7f8efab1f505b4706fb61928b4b25933
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 a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The presence of this anomalous OLE object is the primary indicator of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/f9K.K4 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
da94f0e1555f4205a3b6c5c96b3fe16f662d9a7886175b03f645a7aa5e246d6d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/f9K.K4 1069056 bytes
ooxml_oleobject_00_ole10native_00.bin
0a18ae42a1d1beb0be06de7ac09f259a4b39e00353584972712838a979b1ad58		 ole-package OOXML xl/embeddings/f9K.K4 Ole10Native stream: olE10NAtIve 1058016 bytes

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