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

Static analysis result for SHA-256 ed81a7e9c0114354…

MALICIOUS

Office (OOXML) / .XLSX

608.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-25
MD5: d9d901ed238d8f8509aba3280dd7a16b SHA-1: 07a6d21c1b7f8adb83a2d81271e216e6b2327857 SHA-256: ed81a7e9c0114354455ec14490bbc9e7de4b42d4cabfe3c52be4b9a63e8e48b0
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as an 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 vulnerability like CVE-2017-11882 to execute arbitrary code. The document body content appears to be a fabricated invoice, likely a lure to encourage opening the malicious object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/mLnV.wKGpsii 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
69950b4529aa669868bcd3ce499e0ffbd99d0f0f9de0a502484fa12b69d69e68		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/mLnV.wKGpsii 820224 bytes
ooxml_oleobject_00_ole10native_00.bin
fc9076a164c7bfad67cb05c216079a53d333df0ff3cdf57a8775c977f134d266		 ole-package OOXML xl/embeddings/mLnV.wKGpsii Ole10Native stream: OLe10natIVe 811200 bytes

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