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

Static analysis result for SHA-256 42ffd6fe0c78d3fc…

MALICIOUS

Office (OOXML) / .XLSX

635.5 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: 91a1baf49ff333b4bf26a160be2aefe7 SHA-1: 7b12c0943a0f7a9e32155b4c4a92ce81d698e53a SHA-256: 42ffd6fe0c78d3fc0723196da87ea5e0b1e32b1f2141eaba58c6fa772d706750
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The file contains a high-severity heuristic indicating a malicious Equation Editor OLE object. This object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to execute malicious code. The presence of an embedded OLE object, specifically the Equation Editor, is a common technique for delivering exploits or secondary payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3WAHBPpW5.87 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
224c0cd67ef44fe697ae5ae050527a0b5a7f0fbbdc70ee52035e03c0319970a6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3WAHBPpW5.87 865280 bytes
ooxml_oleobject_00_ole10native_00.bin
b5bacdaed2e0be889251cd86fa3d1b46fb4d5330250a2e31776c73b987e6f829		 ole-package OOXML xl/embeddings/3WAHBPpW5.87 Ole10Native stream: Ole10NATIve 855602 bytes

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