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

Static analysis result for SHA-256 6e4aeb2cc08f63d0…

MALICIOUS

Office (OOXML) / .XLSX

609.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-31
MD5: 4aad888d5c1e47940f7f65afc9b14098 SHA-1: 7621483e9430d9db7dd870c340504c41bb64c73b SHA-256: 6e4aeb2cc08f63d0c293ac257c49917469662302e1c9e882b6f3c04d4bdc2ff3
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability. The embedded OLE object and its anomalous stream are the primary indicators of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/qAO3Dmj.u8X 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
044638df114ccf0e238d5b3fb6fbacd6e2ba73e5590dab42d3e86b1aed1af758		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/qAO3Dmj.u8X 822784 bytes
ooxml_oleobject_00_ole10native_00.bin
3767dd994f040086ad4fb86ed84332570d9d68ceedca6dcf3e4d7d2119ffadb0		 ole-package OOXML xl/embeddings/qAO3Dmj.u8X Ole10Native stream: olE10NatiVE 813770 bytes

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