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

Static analysis result for SHA-256 aac93deaafba0478…

MALICIOUS

Office (OOXML) / .XLSX

672.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-03
MD5: 6d9e6d79babc04eac579ea031b1b4b21 SHA-1: 4e3c526023ca17d127f245dfa7a6b32fee71c25e SHA-256: aac93deaafba04785ad9d5bbe24228ee2deb21b2475dc55bd060d9f628d9f8e7
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's being used to exploit 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/Mow3OiUtj.Rb1YIxR 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
9a7e4db93f8716a866e00cc1b77c89765273870f36b4418fc9bf128bb7f425d6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Mow3OiUtj.Rb1YIxR 1009152 bytes
ooxml_oleobject_00_ole10native_00.bin
732e136b291fe58c4fa1e4e461bbc16602ceaeca2a60cc1afc2d963a300748bb		 ole-package OOXML xl/embeddings/Mow3OiUtj.Rb1YIxR Ole10Native stream: OLe10Native 998479 bytes

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