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

Static analysis result for SHA-256 232bc347c7e663eb…

MALICIOUS

Office (OOXML) / .XLSX

608.7 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-11
MD5: 83acdb285239a57310694a11d83c7cdf SHA-1: c43b0e0d764e430d7dbf127f378d31acec48cd84 SHA-256: 232bc347c7e663ebf574834d9298218fbbdb9eb9c402766f02d368e36642f009
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Office document 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 structure, strongly suggesting it's being used to exploit a vulnerability. The document body contains what appears to be financial or shipping data, which could be a lure or context for the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/KI.Sd 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
464541982a09e90ba0878fabcca458d8deed30947a91d50ed36815a0e6864415		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/KI.Sd 850432 bytes
ooxml_oleobject_00_ole10native_00.bin
cfbb593c6c5259b99c63549c32f38e7d233f7d7f0129f577caf1508ec75a4d53		 ole-package OOXML xl/embeddings/KI.Sd Ole10Native stream: olE10NAtivE 841728 bytes

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