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

Static analysis result for SHA-256 140304e247555866…

MALICIOUS

Office (OOXML) / .XLSX

686.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-20
MD5: 67d51b24e76c6f2f67a4cff02c763632 SHA-1: d25bf77bc4030eec0a9bb19edc90f4db2b3b14b7 SHA-256: 140304e2475558662b7fbf3534d02b99e0d733eac3a83580fadddfa6e6ca8340
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 (OOXML) file 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 header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation. This technique is commonly used to deliver secondary malicious payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/IGn0L.u2S 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
8d8b03e6767b16619d1fb7729ac54278f5de8ccb2b6b01bf06061a998df916f2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/IGn0L.u2S 951296 bytes
ooxml_oleobject_00_ole10native_00.bin
40b5be63fa7120dc02148242c6565ab14d2f1c9da68c0ee0fc7ed3dbb656e6f3		 ole-package OOXML xl/embeddings/IGn0L.u2S Ole10Native stream: oLE10naTiVE 941073 bytes

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