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

Static analysis result for SHA-256 df452be70ac2bb46…

MALICIOUS

Office (OOXML) / .XLSX

664.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-07
MD5: d7398628dd5135f9af7c5d35b9896472 SHA-1: dd001fa2d22201d36ff4f5ef30ed80731b3e3c35 SHA-256: df452be70ac2bb46b5199bd02967fd58f14e2b5421771831e13de65aed1cabbb
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity 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 known 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/up.d7Bu 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
9b31232e123867d1fdeec74e09f215f705fb6a59d4165f6accee32cf7d20918a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/up.d7Bu 962048 bytes
ooxml_oleobject_00_ole10native_00.bin
a8b3230abc5592920c80b0e2de769dc434deeb7b3dbe1ee3b72bb12793213935		 ole-package OOXML xl/embeddings/up.d7Bu Ole10Native stream: OLe10naTivE 951997 bytes

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