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

Static analysis result for SHA-256 59015f14de08b538…

MALICIOUS

Office (OOXML) / .XLSX

677.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-28
MD5: 0605344b0f6c71f28d23b1e09b1226dc SHA-1: ff4b6802a50b09f6a79ba4b08416e594f2606548 SHA-256: 59015f14de08b5383e393f4f2d2f2694b84139d2c52f58d1607f94de020349e5
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. 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 malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/odGSLE5Q.0Gdp 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
0e55ffc5dea3237d7c79b914441507fe12e4e8be1c156236b57760962ada7810		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/odGSLE5Q.0Gdp 926720 bytes
ooxml_oleobject_00_ole10native_00.bin
2c24da586f7cd11e2689024ca75d69bfd1510a753a9cf057f650b3e1d4fdcf2e		 ole-package OOXML xl/embeddings/odGSLE5Q.0Gdp Ole10Native stream: OLe10NaTIVE 916873 bytes

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