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

Static analysis result for SHA-256 5e436f728bc24b0b…

MALICIOUS

Office (OOXML) / .XLSX

637.1 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: e7f8eb87df4cf7ba0167b9aa42f69006 SHA-1: 547b8ff9ac1c2b3a43b9b403b0df9b4216bea788 SHA-256: 5e436f728bc24b0bc38321c818d846bf020f3c4c797a1e6abed043d2e05960a1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

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 discrepancy, strongly suggesting exploitation of a vulnerability like CVE-2017-11882 for client execution. The document body contains what appears to be a parts list, likely a lure to encourage opening the document.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/hDBRBebQo.ukK 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
290b2458fba50124102c29d76c482ac66bd38b8eab47f04d1fb9a4708ea04fb2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/hDBRBebQo.ukK 860672 bytes
ooxml_oleobject_00_ole10native_00.bin
f3a642f90de03c831768d63e3170c5994f3ad8c8f3a3a95203b836074e0bcfb0		 ole-package OOXML xl/embeddings/hDBRBebQo.ukK Ole10Native stream: OLe10NATive 851092 bytes

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