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

Static analysis result for SHA-256 5257ed9bfe6ef0ee…

MALICIOUS

Office (OOXML) / .XLSX

755.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-30
MD5: edb0b5567a2f1c4782f4db5fba35aaae SHA-1: 7bc3cdbda28ecd7bb10e8712e919f9cb0d6d8bb0 SHA-256: 5257ed9bfe6ef0eee0fef5545481fa59c9987892701188740f267ed76bb3851c
100 Risk Score

Malware Insights

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

The file is an Office 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 a significantly larger declared inner size than the actual stream size. This strongly suggests the exploitation of a known vulnerability within the Equation Editor to execute arbitrary code. No scripts were extracted, and the document body appears to be a commercial invoice, likely a lure.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7Il0Fpf.1wAG 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
76aecd9eed7d8c0a2789c55971462a31094f89122a676a644a48760363ca67f7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7Il0Fpf.1wAG 1040384 bytes
ooxml_oleobject_00_ole10native_00.bin
d38b7bebd1a3114274169f723c25616d577a4c7f54e67c180918eea6aea8884d		 ole-package OOXML xl/embeddings/7Il0Fpf.1wAG Ole10Native stream: ole10NatIVe 1029726 bytes

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