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

Static analysis result for SHA-256 9c24d100e91e39ca…

MALICIOUS

Office (OOXML) / .XLSX

719.2 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: e6f8edebd3177110fd130c3cbdd7376e SHA-1: 343a362eeee6d494de6f70989a29e93496a0092e SHA-256: 9c24d100e91e39ca2666e8bd5c486388b71a5265046682b105d9b32fefc43fb8
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (OOXML) file 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, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) to execute arbitrary code. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the provided evidence.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5e1jOQ05.rxenC 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
2a00ebbd8f2531406bdea71c2eea7d70c885fe3b89b3efea799ca8125f767f07		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5e1jOQ05.rxenC 983040 bytes
ooxml_oleobject_00_ole10native_00.bin
e2b263ee2d0ce94b8a90825168a8a81bf91fb52bff2ab2872d51b11755abbd92		 ole-package OOXML xl/embeddings/5e1jOQ05.rxenC Ole10Native stream: olE10nAtIVE 972892 bytes

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