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

Static analysis result for SHA-256 0fed6930b6259f4b…

MALICIOUS

Office (OOXML) / .XLSX

714.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-24
MD5: 4492653ee698387f17c47eed7af710d1 SHA-1: 35e80864b6f26a45000dc9422dcfc6ae749cce9e SHA-256: 0fed6930b6259f4b073f008ab91ed8f801743b4ff2fee4a84274a85835e38e2b
100 Risk Score

Malware Insights

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

The file is an Excel document 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 and header, 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/LSCt.xS 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
706ade35817dec36fa449e6b351e35432a380309f0fd0dd943fddfd8db662a29		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/LSCt.xS 1017344 bytes
ooxml_oleobject_00_ole10native_00.bin
affa6eab8f5d5f64c4b2eb026fadaec1145f69fda84f3e00886e17fc3bb8444d		 ole-package OOXML xl/embeddings/LSCt.xS Ole10Native stream: OLE10nATiVE 1006652 bytes

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