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

Static analysis result for SHA-256 77dd6d7a6aaf4ab0…

MALICIOUS

Office (OOXML) / .XLSX

747.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-10
MD5: 93048fb5378536987725de76bbfa3b79 SHA-1: 1014c14f4eae860ab0db51c6d77cc5fa35b36b7a SHA-256: 77dd6d7a6aaf4ab01436d811e3fdff13d2f94324d07f746b0bab783a0622eaa1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an OOXML 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 known vulnerability (e.g., CVE-2017-11882) to execute arbitrary code. The embedded artifacts and heuristic firings point to a malicious dropper designed to leverage this exploit.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dec.EP6GC 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
7cfd69a3a3f43c15dbd49c58cd5564ceed2c580890da7241fcfbf979d3993a91		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dec.EP6GC 1075200 bytes
ooxml_oleobject_00_ole10native_00.bin
7fc68c80865db06151d2d5d9d39533402b07b4cd8b25bd1d98de866d60a95680		 ole-package OOXML xl/embeddings/dec.EP6GC Ole10Native stream: olE10nAtivE 1064291 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.