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

Static analysis result for SHA-256 131cc9d57462d2c1…

MALICIOUS

Office (OOXML) / .XLSX

704.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-16
MD5: 5db7de7484c27fd230f7189a8a53747f SHA-1: 715d87d57d57e9378cdb9d19f3cecfdbf55720e1 SHA-256: 131cc9d57462d2c1dabf9f0d56a006d6d5da0532c1041655bc6dbfd93df6494b
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits an anomaly where the Ole10Native stream is unusually large and has high entropy, strongly suggesting it carries a malicious payload. The presence of an Equation Editor OLE object is a known vector for exploiting vulnerabilities, often leading to arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tKOaX0.eo57rr 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
ba97cff9b434e41c14d01bf19c9086230bc1710e743617e07cfd3a3a0b9081b4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tKOaX0.eo57rr 998912 bytes
ooxml_oleobject_00_ole10native_00.bin
419f730b420d057cbb55b6bdcd755bf577a054b456f906c5725f3522cf2af6b8		 ole-package OOXML xl/embeddings/tKOaX0.eo57rr Ole10Native stream: OlE10NAtiVe 988664 bytes

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