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

Static analysis result for SHA-256 bd894837ffe28e3d…

MALICIOUS

Office (OOXML) / .XLSX

637.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-10
MD5: 82a3a2e03ce908ecd36d17707d85ec47 SHA-1: 6519362968b70e4a30fd4cf99956018ccf726bf4 SHA-256: bd894837ffe28e3d7075aca49c2c79e3464d890fe22ccea28e1bd56676123481
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model and Distributed Component Object Model: Component Object Model

The sample is an OOXML file containing an embedded OLE object identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and high entropy, strongly suggesting it's a dropper for a secondary malicious payload. The embedded OLE object itself is a common vector for exploiting vulnerabilities like CVE-2017-11882.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/spUk.cYR 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
5c5a3fe6585697880258fe73f485d3f860214839a61f0c2b78e534715948ae19		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/spUk.cYR 862720 bytes
ooxml_oleobject_00_ole10native_00.bin
1c1df0fcd62d9bebd7fe566c024e60a751942b19c751e0d7e104afba9fa01524		 ole-package OOXML xl/embeddings/spUk.cYR Ole10Native stream: oLe10NATIvE 853005 bytes

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