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

Static analysis result for SHA-256 aa58a7fe408a357c…

MALICIOUS

Office (OOXML) / .XLSX

634.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-20
MD5: 511e9229dec350735267fe7a752b5ac0 SHA-1: f10567fc5c6ab310605d11edd293a1a2901fa49b SHA-256: aa58a7fe408a357c51f347af61022d8192a765b9607b664ec09f2b4f5287a041
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 an Equation Editor object. High-severity heuristics indicate that this object carries a payload-like stream, suggesting it's designed to execute malicious code. The document body contains what appears to be a fabricated invoice or order list, likely serving as a lure to encourage interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5sTX.DOHDr 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
4702f621264fbd84f70feab4fc2f48b2f07bc062fee7ac402e796e639b261664		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5sTX.DOHDr 907264 bytes
ooxml_oleobject_00_ole10native_00.bin
46eb8c121b2ffb9971de7cda88b0b9202797964e122cd9e6214d8c677d98d59a		 ole-package OOXML xl/embeddings/5sTX.DOHDr Ole10Native stream: oLe10nATIve 897788 bytes

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