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

Static analysis result for SHA-256 38fd388175b72d46…

MALICIOUS

Office (OOXML) / .XLSX

594.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-21
MD5: 22889d9c8fab06f53636cfc28d3b4ee6 SHA-1: 6f156c41252ab374a30042b22b9bb9641746fe52 SHA-256: 38fd388175b72d4696a152dc54ac3aa253f8638b8c944e7a751adcfb97250f44
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet 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, suggesting it's designed to exploit a known vulnerability. This points to a malicious document intended to execute arbitrary code upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/HUkntm.VI7GS 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
b6537217fca4b1a497307ab440241e811c34c76263dc0b8a5a93046afa3c2615		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/HUkntm.VI7GS 876032 bytes
ooxml_oleobject_00_ole10native_00.bin
767d930243b2c71374d7cd511ad113a911517a0d69332ba0542eb3cb565ca66b		 ole-package OOXML xl/embeddings/HUkntm.VI7GS Ole10Native stream: olE10NaTIVe 866796 bytes

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