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

Static analysis result for SHA-256 af62f8aa5f21ff5d…

MALICIOUS

Office (OOXML) / .XLSX

628.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-12
MD5: 48960ca8f7a654296e57ba9e2ce88498 SHA-1: da69e16777a7432b9c405728725a4cb8966556fc SHA-256: af62f8aa5f21ff5d8081a5648ef2f37b1a2682509a96da272adba5ce4f31d844
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document 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 and header, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The document body, formatted as a purchase order, likely serves as a lure to encourage the user to interact with the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/urWsvv.KWVa6T0 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
17f3694b61353b056b7772f2c1cd1efcd730d896d08074feffa8eab85f65ed3a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/urWsvv.KWVa6T0 905216 bytes
ooxml_oleobject_00_ole10native_00.bin
afa573b36386723df2922a6593bfa71288983302b68613310577ea4fb2d0b1a2		 ole-package OOXML xl/embeddings/urWsvv.KWVa6T0 Ole10Native stream: oLe10nATiVE 895921 bytes

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