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

Static analysis result for SHA-256 14644dd50705f492…

MALICIOUS

Office (OOXML) / .XLSX

698.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-07-30
MD5: be1c92a6be116ab12e687f0bb637d008 SHA-1: 2c1ae5fe0001968381dcdc3c265206bb489712f5 SHA-256: 14644dd50705f49292b3f35d985de7431d07c1b552c4ce5a3a30804f52030e70
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882). This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/4w2MRHrW.OQU 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
883871c94e105343bee9bab5b56f98dd3837a2078af1fb3e7734142c31d7a9ef		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/4w2MRHrW.OQU 1001984 bytes
ooxml_oleobject_00_ole10native_00.bin
4474485f542f478b401206a05e1f39ca8b3c166d12fcf22febe8f419d04632f5		 ole-package OOXML xl/embeddings/4w2MRHrW.OQU Ole10Native stream: OLE10natIVe 991451 bytes

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