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

Static analysis result for SHA-256 4e0a38aaa93cbcee…

MALICIOUS

Office (OOXML) / .XLSX

692.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-12
MD5: 627f86d873bab221c497805878cc21eb SHA-1: c40f0393c10618319cf20a727d0e2efe876ec071 SHA-256: 4e0a38aaa93cbceef10e172853142d87213952ad3b4ff3727cf7d633d5f4bf95
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object, specifically identified as an Equation Editor object with a suspicious Ole10Native stream. This stream's size and entropy suggest it carries a malicious payload, likely exploiting a known vulnerability in the Equation Editor component. The document body is formatted as a purchase order, a common lure for social engineering attacks.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/yTAUZ.tg4z 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
7d6f57a0842415ca11b5ac17bd9734b9642e512f09a4c49491cc5fc930dfb7cd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/yTAUZ.tg4z 932864 bytes
ooxml_oleobject_00_ole10native_00.bin
de11c122fba13067fd948dd037121ccab27ff0c3504732b38f0cdaa00acb279c		 ole-package OOXML xl/embeddings/yTAUZ.tg4z Ole10Native stream: OLE10NATIve 922846 bytes

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