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

Static analysis result for SHA-256 88b7aa1440c142fa…

MALICIOUS

Office (OOXML) / .XLSX

732.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-12
MD5: 7afc04fe319f9175f4ee996926ecd6c5 SHA-1: 63ba61a0400e2c9afbf9184ce70fa43600271ed8 SHA-256: 88b7aa1440c142faa404021ffe25eb4cf1bf7d4b2b7979c7ffdc98014961aadf
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 size, strongly suggesting exploitation of 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/JrVtEUnl.WbtmYpM 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
94d1a1023111e01dd7fdb3eb03ae7595430bb2f41f43498fc87356799236fd29		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/JrVtEUnl.WbtmYpM 1025024 bytes
ooxml_oleobject_00_ole10native_00.bin
c4812c8c03d5811b6c6e85ea3176727dcb65fa4a715fe36eac18a43b99c1ff58		 ole-package OOXML xl/embeddings/JrVtEUnl.WbtmYpM Ole10Native stream: Ole10nATive 1014531 bytes

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