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

Static analysis result for SHA-256 e27d991d6de2626d…

MALICIOUS

Office (OOXML) / .XLSX

211.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 4b5afe26453cb5cd04d3c3f725818f5d SHA-1: fd063ebdd70b17a21cabda37b6d198a4a51f6993 SHA-256: e27d991d6de2626dcd97360139e675d1d44bf4144a7e43b94c53fb65bca7ba92
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. This suggests the document is designed to leverage this vulnerability to execute a malicious payload upon opening. No scripts were extracted, and no document body was available for analysis.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
58782b271f97401010c8caa0ab0297bb829819df136aacb80a90f96fbb99aba1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
5ef6e6a896922f2fb5d4e2255c79c09a6345e52ea00607eaf3e93ec36120e76c		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NAtIvE 1388 bytes
emf_00.emf
279af8178af804fb11e9858d22042656baf0cfb48a12cff7dbbd6f77e3e30fb5		 ooxml-emf OOXML EMF part: xl/media/image7.emf 498420 bytes

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