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

Static analysis result for SHA-256 8e0c70fa9c6c7bef…

MALICIOUS

Office (OOXML) / .XLSX

1.98 MB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-06
MD5: 5186385725f0c78fd2e358ae7a5bc4a5 SHA-1: c5a6ba30765f2f6eb29feafafb447105ae1f20bb SHA-256: 8e0c70fa9c6c7bef958499df864d286b2bb3f99d9e11c68077737507528d9e22
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The presence of this embedded malicious object points to an attack pattern involving exploiting software vulnerabilities via document attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Hh8Bh3.5xkI 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
e37abcad78edfc74c703cb25a682098713e7c3771686976c2cd7a5268295d0da		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Hh8Bh3.5xkI 2812416 bytes
ooxml_oleobject_00_ole10native_00.bin
cf9639c60ce14a09892736372c6e31b23b83c59fa4620a3bec37103602a1e424		 ole-package OOXML xl/embeddings/Hh8Bh3.5xkI Ole10Native stream: OLe10NAtIvE 2788194 bytes

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