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

Static analysis result for SHA-256 8aac77368f019389…

MALICIOUS

Office (OOXML) / .XLSX

641.7 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-30
MD5: 7e526650f60c57ed464b34180c0395bc SHA-1: c6a8fa43a1088ec3c539f6c3dbd6f9a1bb49ad9e SHA-256: 8aac77368f0193897ebbb56b6894c1af81479730175b96df7b858e0e8a899a63
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for exploiting Equation Editor vulnerabilities.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Pj229dFu.r8l 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
014b460f3c8a527ffc6e30fff4012988417ce6a0c61088d75d75aa7a31d7a680		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Pj229dFu.r8l 945664 bytes
ooxml_oleobject_00_ole10native_00.bin
80df44a8f128c75a633ac9b017616064eac274f7f41738eff924a6484f3a8ab1		 ole-package OOXML xl/embeddings/Pj229dFu.r8l Ole10Native stream: olE10NAtIve 935436 bytes

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