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

Static analysis result for SHA-256 007ff5e64be992ed…

MALICIOUS

Office (OOXML) / .XLSX

609.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-17
MD5: 22c0907eebd22315d99b6a65d9dadc61 SHA-1: 07871444efa248bcbddb494e6405dc60bb7f867c SHA-256: 007ff5e64be992ed067aa31be42dfb3a950636155c461045730422b0137165bb
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 Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size mismatch, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This mechanism 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/3q7an5.AbCa8j 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
40e2a67a33174ea3648e554511ec4c6566e5f84c10502215dc49a9056ed06b80		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3q7an5.AbCa8j 831488 bytes
ooxml_oleobject_00_ole10native_00.bin
1ffbc1f2b475a51418617de7ca4dc99fe15a1754c811006886d485afe90531fe		 ole-package OOXML xl/embeddings/3q7an5.AbCa8j Ole10Native stream: OlE10nAtiVE 822504 bytes

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