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

Static analysis result for SHA-256 3c3e872e0df7b780…

MALICIOUS

Office (OOXML) / .XLSX

748.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-03-06
MD5: 5c673daf8adddd84a0278d21944037ab SHA-1: 15fa6dfc9b0deea6c980ae4354f4cad4cc9c0fa1 SHA-256: 3c3e872e0df7b7806ae47b846cb2d8d65ac3c0b2b9e38c1d3cbd95f7e6bcbbc7
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size, strongly suggesting it's being used to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/DC1SrEHu.SKs8NU 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
79ea1453e50265785ce96656e2a3f6678caca701b8617971d063afd5b19aed76		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/DC1SrEHu.SKs8NU 1049088 bytes
ooxml_oleobject_00_ole10native_00.bin
adae327505092a96f7e7e9dbee82fd84cab1cfaa3dd48e2fb505711f513f73e6		 ole-package OOXML xl/embeddings/DC1SrEHu.SKs8NU Ole10Native stream: Ole10natiVe 1038511 bytes

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