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

Static analysis result for SHA-256 30f22c80605498ba…

MALICIOUS

Office (OOXML) / .XLSX

689.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-15
MD5: 7d48b3d84c624f533b0bcbd8bf94cabf SHA-1: 486a105d7bc55b28d958eec65947242a48777e2a SHA-256: 30f22c80605498ba3b7f803c4ec9061ba59888f7c1ba4f8268b7176e36dc0986
100 Risk Score

Malware Insights

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

The file contains an embedded Equation Editor OLE object with an anomalous Ole10Native stream, indicating it likely exploits a vulnerability (CVE-2017-11882) to execute arbitrary code. The large size and high entropy of the Ole10Native stream suggest it contains a packed or encrypted payload. The document body itself appears to be a fabricated invoice, likely a lure to entice the user to open the malicious object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/mDr.76lH 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
3066ad5e0dcde424d5baf7900cd896b197cc655bccddce0d3cc70c29fbe40621		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/mDr.76lH 976896 bytes
ooxml_oleobject_00_ole10native_00.bin
83ae071f635e89243864c86b7a3b904d487a7c58a831da60f11e6c17dd84bc5d		 ole-package OOXML xl/embeddings/mDr.76lH Ole10Native stream: OLe10NATIvE 967030 bytes

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