Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 672ba89d8b066d67…

MALICIOUS

Office (OOXML)

1.04 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-05-23
MD5: 86cd56684e37ad79c5e6873ade9271dd SHA-1: b403d288263500f419d193811f5a0922cb81d0e0 SHA-256: 672ba89d8b066d67f54b70358410c226a46bf41d17eeab954e40dc2896fab66a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a malicious Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 by leveraging an anomalous native stream within the Equation Editor object to deliver a payload. This technique is commonly used to achieve arbitrary code execution on the victim's machine.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/v0Ku1m.8J contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/v0Ku1m.8J 1408000 bytes
SHA-256: 524d49cb603952df9b2b4a177ed6f7fa0e472f612669b27a01917348de6091e9
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/v0Ku1m.8J Ole10Native stream: Ole10NATIVe 1394349 bytes
SHA-256: e06ffad6019a365fcee045592f03c035dc0e88282f3a2a696d18a92d3c1f595f

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