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

Static analysis result for SHA-256 85d3df4189fe070a…

MALICIOUS

Office (OOXML) / .XLSX

704.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-20
MD5: 1c03a8e6947f3f75563b409c4036f0c6 SHA-1: 067a01450d10013826e9a1144b1f1fe0ae3b08ab SHA-256: 85d3df4189fe070a94b8daf410a1661d80dbf5a3607328adbfefc22e520b1c82
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's being used to exploit a known vulnerability (e.g., 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/46pq.d8aD 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
7287b3e9a9ced7fbc775a6eeb84cb33811c4a3c68dbe4fbccff84b995f6f7ca9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/46pq.d8aD 936960 bytes
ooxml_oleobject_00_ole10native_00.bin
00cb8a6b328dcbb50aba4189cf9370531474639aa5af8488d38dee858883fe70		 ole-package OOXML xl/embeddings/46pq.d8aD Ole10Native stream: ole10natiVe 926963 bytes

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