Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f8fc7c2b0202c3a0…

MALICIOUS

Office (OOXML)

28.2 KB Created: 2010-02-14 08:32:05 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-04-18
MD5: 36b6aa572327006b81052c4590aaff7b SHA-1: d5edbaf1ff0ecb8f19d675926a6c40ad255bc0f9 SHA-256: f8fc7c2b0202c3a0b86d458f9e5a24e6e3d4ed0c27bbc431f854180d1ec5dd61
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a vulnerability related to CVE-2018-0798 within this object, suggesting it's used for arbitrary code execution. This is a common method for delivering secondary payloads, hence the classification as a spearphishing attachment.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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.
  • 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/oleObject1.bin 4096 bytes
SHA-256: 9f3064f172b002476bd47e73efaaec1a60a2e1740b903c2e67facd44fe8f7b25
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NaTIve 1720 bytes
SHA-256: 6b0a4a6b44cc157110951da2f229808b573714a8f68730f24611ba32a9a52391

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