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

Static analysis result for SHA-256 d0a9ffcf4ddefa23…

MALICIOUS

Office (OOXML) / .XLSX

712.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-09
MD5: 895dd8b1b64fc5183dfc82215c512e32 SHA-1: 5030c4ec85d57c001f9fb5040ec0f1863a64ac56 SHA-256: d0a9ffcf4ddefa23938673d86deac0a145365d93a082a8f413f1d8324d6c2bb5
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous size, strongly indicating exploitation of a known vulnerability within the Equation Editor. The presence of this object suggests the file is designed to deliver a malicious payload upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/9Q.B2VhHE 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
d8cc4fea40b06c08822e7a2e611253e9af5d3b2a77afa1ffbcc7129d5849fb74		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/9Q.B2VhHE 1035776 bytes
ooxml_oleobject_00_ole10native_00.bin
9c94e3d3c94da853c366ca4736deedef303c47abf66d581a1004bcf99dc9e706		 ole-package OOXML xl/embeddings/9Q.B2VhHE Ole10Native stream: OLe10nATIVE 1025195 bytes

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