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

Static analysis result for SHA-256 1c3935ab341890c4…

MALICIOUS

Office (OOXML) / .XLSX

668.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 8da0571e3bb0d82a05b48c4729a92990 SHA-1: 7d0f081fd8e0f0058f8e3a47b13b1a23e51988b9 SHA-256: 1c3935ab341890c402f5441d34266a4b1cfe118b30b631e0cc221e9ae3e3aff7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits anomalies in its Ole10Native stream, suggesting it carries a malicious payload. The presence of an embedded Equation Editor object is a strong indicator of exploitation attempts targeting known vulnerabilities, likely delivered via a spearphishing attachment.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/siMpT.dcX 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
77e0d2d201b2dba65208a9f875db54a818d2a3a8d59ed885c74e00898bf9eb8a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/siMpT.dcX 1000960 bytes
ooxml_oleobject_00_ole10native_00.bin
d89692b65a7652abd80cf21684d1cc6559bc3b30fdcbddb61431d751cbd2708d		 ole-package OOXML xl/embeddings/siMpT.dcX Ole10Native stream: oLE10nATIVe 990409 bytes

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