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

Static analysis result for SHA-256 803dbe4358ea84a8…

MALICIOUS

Office (OOXML) / .XLSX

656.7 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: c860a74a119a235d0c7b67d3bd12cfd0 SHA-1: df42173bfadde9327b9ca57202e546d891941f11 SHA-256: 803dbe4358ea84a8013942e1b5a8b897ac8ce4144740d1a6f7bddb47da4edb7f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, strongly indicating exploitation of a known vulnerability. The presence of this object suggests the file is designed to exploit the Equation Editor vulnerability to execute a malicious payload upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/4J592Y6A.xY18ht 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
8834464076f0bf7c71328cc718842f808c72cedbac11b921992803c1d04ad5c9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/4J592Y6A.xY18ht 978432 bytes
ooxml_oleobject_00_ole10native_00.bin
f1a8cb86c3cbaaeb7270ef37b983f2bfb9648ddab8e322fa3f5d4b16b2ce3ba8		 ole-package OOXML xl/embeddings/4J592Y6A.xY18ht Ole10Native stream: oLe10NAtIVe 968268 bytes

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