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

Static analysis result for SHA-256 c058524520cbf82d…

MALICIOUS

Office (OOXML) / .XLSX

653.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-17
MD5: d039e48c4b284f499d0ca5eca3d608fb SHA-1: c2c7c05f1823be8094115ffe224f9be8cb76651c SHA-256: c058524520cbf82da699be0a35d9cb9fcaf109cb69d2655ca59b061250f7b412
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. 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 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/ASLF1.vMW2 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
ac96d62575b43f1cc8257e393485b3823c39582ffa869c6d28354408bf2e25cd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ASLF1.vMW2 951296 bytes
ooxml_oleobject_00_ole10native_00.bin
d36b514261c415798dc97f6b875bddbcc2a87daf3443edc7976d959f7dde2ea0		 ole-package OOXML xl/embeddings/ASLF1.vMW2 Ole10Native stream: olE10NaTIVE 941291 bytes

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