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

Static analysis result for SHA-256 02a837d139709853…

MALICIOUS

Office (OOXML) / .XLSX

685.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-22
MD5: dddabc8019a7184055301927239a9438 SHA-1: 1d196f7a5ac96f5632c536017546001491ca1e46 SHA-256: 02a837d139709853b2ab7c3f1c55802c880fd133b731cfb2a15830230c5babd2
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zq6c.lx 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
58cf25a2b0f78643aa5b088952c1617423ab1b038404ad0da63f03304501aa98		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zq6c.lx 952832 bytes
ooxml_oleobject_00_ole10native_00.bin
f527e90067197e1be8372ed94f4a107babf55f725a9f4bdb74b808218d5daf00		 ole-package OOXML xl/embeddings/zq6c.lx Ole10Native stream: Ole10nativE 942699 bytes

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