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

Static analysis result for SHA-256 e0151a7929d3bc04…

MALICIOUS

Office (OOXML) / .XLSX

665.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-20
MD5: 4518b473032a549e3314714f91dceb57 SHA-1: 6581a67e6ac2ab58223fa1af01708baa13bad270 SHA-256: e0151a7929d3bc048806c5d9df0ccc33565abb97c09f2f7a146167e66c4c0f34
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

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 and entropy, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique 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/HbK.i24L9 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
d4a0be36c595aba0413c3776c163960497bff6cde4873242b88ae2aba1c1d669		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/HbK.i24L9 947712 bytes
ooxml_oleobject_00_ole10native_00.bin
9965833bedbaa4d5dee5b56e512a846f82a471201d609a3210537fd4d2c18ad6		 ole-package OOXML xl/embeddings/HbK.i24L9 Ole10Native stream: oLE10natIve 937628 bytes

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