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

Static analysis result for SHA-256 72b9f1636f3c2e19…

MALICIOUS

Office (OOXML) / .XLSX

694.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 7b9cae3a432791a6d4e98a331c41d356 SHA-1: 0636b1a423a5347e176cf0a719c2f6c83f289d85 SHA-256: 72b9f1636f3c2e199547e9d9490e4daa18a10b032e11dc71eec91ec5e535ef5c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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. 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 known vulnerability like 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/0V5a2mOS.kE2SaG 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
e283d48a437a1248c1e515b6d6729a0298497d805630f0b5ed9d130aec474ab3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/0V5a2mOS.kE2SaG 949248 bytes
ooxml_oleobject_00_ole10native_00.bin
a2bdc3b75f1f3ebbc113759ab061e722014f363cc538c2b4c223e4241335e7f6		 ole-package OOXML xl/embeddings/0V5a2mOS.kE2SaG Ole10Native stream: OlE10nATIve 939288 bytes

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