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

Static analysis result for SHA-256 19b07ad1358ca7e9…

MALICIOUS

Office (OOXML) / .XLSX

723.3 KB Created: 2023-08-16 00:19:08 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-16
MD5: aee190ea6ad88af827f61dacb7b42688 SHA-1: a13fa95f8a633f1a2790b20470e33197f409a001 SHA-256: 19b07ad1358ca7e9452f28c5cc933feed409a368b7c26466e7e90084acc18784
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This indicates the document is designed to exploit this vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/nwL.8pGn 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
7eb25e56f63956b810465736ac375056304cc0af2efb05a36feda9e47f78f9ef		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/nwL.8pGn 1001472 bytes
ooxml_oleobject_00_ole10native_00.bin
d767b84d1bfbee2ddd43c38232af5f2f3d5397a90cba37f83ccef18ae97755f7		 ole-package OOXML xl/embeddings/nwL.8pGn Ole10Native stream: oLe10NaTIvE 990872 bytes

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