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

Static analysis result for SHA-256 7030ce2168e0d5c3…

MALICIOUS

Office (OOXML) / .XLSX

674.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-07-17
MD5: 9151e363527eee7f4b503e06ebfe5714 SHA-1: a89e6f2638bd31da6f523a565b5bab37fb893c7a SHA-256: 7030ce2168e0d5c36dd6c7ac5e367f63cabd5605d7c7ee621c6a9aaec201d2ea
100 Risk Score

Malware Insights

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

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 a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a 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/Gp.meaWCgm 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
2805c18771fbbbb52e990d7e9d3c0c1e07f8c2484f69c418dd9c2e49b7f8db08		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Gp.meaWCgm 926208 bytes
ooxml_oleobject_00_ole10native_00.bin
d541ae31b5625913726695f2b5de0fd8482cc159a5300d60e5d81461cf4bb552		 ole-package OOXML xl/embeddings/Gp.meaWCgm Ole10Native stream: OLE10NaTivE 916446 bytes

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