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

Static analysis result for SHA-256 44b16454fab1f13f…

MALICIOUS

Office (OOXML) / .XLSX

730.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-10
MD5: 51651b4596d8735c44b72e5459e8f4a4 SHA-1: 352be802861c76947194eb8b6a3bf9c65482a566 SHA-256: 44b16454fab1f13f84967bb6135e3f7546101c054bb5e241ee5ac86b301c8c7c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is an OOXML file 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 header and a significantly larger declared inner size than the actual stream size. This strongly suggests the exploitation of a vulnerability within the Equation Editor to execute arbitrary code, likely to download and run a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5dCpDi.10KFo 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
c604aad44922b30bf7265c7a92ac3f2d8ef664d692f8f587483403dd8e8188e9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5dCpDi.10KFo 1028096 bytes
ooxml_oleobject_00_ole10native_00.bin
a6fa16e117cfb89f2f08ebf2f37d045da943de5b14037b1caa89d259c530e4b5		 ole-package OOXML xl/embeddings/5dCpDi.10KFo Ole10Native stream: OlE10natiVE 1017583 bytes

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