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

Static analysis result for SHA-256 08ccb639d18f192a…

MALICIOUS

Office (OOXML) / .XLSX

654.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-14
MD5: f9c751e5401e79c31035aca15457de58 SHA-1: 9c63006dad14db3bf5ea40fdccd86ede8f3e526b SHA-256: 08ccb639d18f192ab8120a9c5e2b9eb1499ab6e948aa25d8f108ed49228366ce
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an OOXML file 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 used to exploit a vulnerability. This technique is commonly used to deliver second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jLuhq8UO.1RtL 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
3589775787fa2720e5020814f91bea6c8db3319cfb6adb843fd61c7f7f797bbf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jLuhq8UO.1RtL 897024 bytes
ooxml_oleobject_00_ole10native_00.bin
7a9b8f55a8b8ef6de0136d7b0c561f54ac91a767b63281cab3dcf0d518b09ebe		 ole-package OOXML xl/embeddings/jLuhq8UO.1RtL Ole10Native stream: oLE10NaTiVE 887299 bytes

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