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

Static analysis result for SHA-256 5dc7110094e6e31b…

MALICIOUS

Office (OOXML) / .XLSX

635.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-20
MD5: 56899109fb2dbe3ae168f97fa3db449e SHA-1: e9d24b9dc82d8f6fd8924cec9e81a35aa7c06c71 SHA-256: 5dc7110094e6e31b2cdc10fbdf11238115b8a9b52354eb292d30038799f1c93a
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 an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and an unexpectedly large declared inner size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/pIQxEgkfH.Md 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
0852794560c7cb7904e3993d049863f345c6a32adf02cdba5bd47aac00492e17		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/pIQxEgkfH.Md 934400 bytes
ooxml_oleobject_00_ole10native_00.bin
f3d649b982374b04eeb66292cb5d1eed3b4b5edbd112ab3374611d7f782c4522		 ole-package OOXML xl/embeddings/pIQxEgkfH.Md Ole10Native stream: oLe10naTIve 924213 bytes

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