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

Static analysis result for SHA-256 b136b1ae5839a5b1…

MALICIOUS

Office (OOXML) / .XLSX

694.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-30
MD5: 5a1c7978a1ef65ba901b4e5e8a9caee1 SHA-1: fb90144af9df223483577869d16de13ece9cb928 SHA-256: b136b1ae5839a5b1cff1d8eca50779a3b48f5c524a8f5a1e523e672a06da025d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file contains 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 size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for exploiting CVE-2017-11882.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jWqmPh.Ls2zn 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
7581d6d4594cf0b2c92e3d19b01e6ef4ec4e0a1e0fe4cfdb71dc86a87beb1f1d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jWqmPh.Ls2zn 1041408 bytes
ooxml_oleobject_00_ole10native_00.bin
8922dc35b42616f97651cada4b9e04cc6e85d284916e52b47089b47bec719db5		 ole-package OOXML xl/embeddings/jWqmPh.Ls2zn Ole10Native stream: Ole10nATIve 1031016 bytes

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