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

Static analysis result for SHA-256 0935f662f94abce8…

MALICIOUS

Office (OOXML) / .XLSX

742.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-29
MD5: ffa36ab31490ed8673cf0a764533957a SHA-1: ff1fac0949253aa6702ac699da51a3063659ade9 SHA-256: 0935f662f94abce86c36498625b8623d4e37dd790394ae78a6cd8d33b71707d4
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a known vulnerability to execute arbitrary code. The document body itself appears to be a fabricated invoice, likely a lure to encourage opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5X5YzfP.8VE 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
feeb330d2bc90e9e50523ba3069366b3b6b1fd9330ce5ab4a423be61719d6485		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5X5YzfP.8VE 1067008 bytes
ooxml_oleobject_00_ole10native_00.bin
4795689778f6630c2081dd644c697bc6f8eca39fe85a2b3956ca4e8895fdcba8		 ole-package OOXML xl/embeddings/5X5YzfP.8VE Ole10Native stream: OLe10NATivE 1055799 bytes

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