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

Static analysis result for SHA-256 302dfafb65070e5d…

MALICIOUS

Office (OOXML) / .XLSX

592.5 KB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-16
MD5: 8ddf88fdd4f6f67b3b9c4306b030ef8c SHA-1: ed647beb086c097a0a246eba1e7321379ee5b227 SHA-256: 302dfafb65070e5ddde5ee5d7fb385a3db11876a6f3bbf830db2f3fc379a2825
100 Risk Score

Malware Insights

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

The XLSX file contains 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, suggesting it's being used to exploit a vulnerability for initial execution. The presence of an embedded OLE object points towards a spearphishing attachment delivery method.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Oc.DGVfgX 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
1fc14cea2623b5c780d1a9aaf2edc51391a565f82cf7fd6c396adbe2632c96c6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Oc.DGVfgX 898048 bytes
ooxml_oleobject_00_ole10native_00.bin
6fa7be77157874e1a58a44b08cc7c9a33b9c2f2083a71edd6ef2253d86165d08		 ole-package OOXML xl/embeddings/Oc.DGVfgX Ole10Native stream: OLe10naTiVE 888456 bytes

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