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

Static analysis result for SHA-256 9c62a1531f3662bc…

MALICIOUS

Office (OOXML) / .XLSX

2.16 MB Created: 2025-08-18 05:08:49 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2025-08-27
MD5: da877ba9ffaa296f08983e1993d7d82e SHA-1: 0fce87c4437768d3170a1c268cd020cff0338cb3 SHA-256: 9c62a1531f3662bc3e36516d18e3ad4acb6d489da2f47731a3c3be9a68d84819
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Office document containing an embedded OLE object, identified as an Equation Editor. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's being used as a vector for exploitation. The document body contains what appears to be garbled text or data, further indicating that the primary content is not user-facing but rather a lure for the embedded malicious object. The presence of an Equation Editor OLE object is a strong indicator of exploitation for malware delivery.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/AMtsKFJXp.Mho 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
d691b19d06f51c4970ae9b7349bfad73bcddaac3c7915c19cbca6be915592be1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/AMtsKFJXp.Mho 2990080 bytes
ooxml_oleobject_00_ole10native_00.bin
dba1482167d08a4eee2a8d9bc0f767e5c7689eb17c45dadc37d0bd8a87f51c33		 ole-package OOXML xl/embeddings/AMtsKFJXp.Mho Ole10Native stream: oLe10NatIve 2964437 bytes

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