Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9a80e324f9a41e2e…

MALICIOUS

Office (OOXML)

17.4 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2020-05-25
MD5: 1fdc3c75e59a93b0c21dff913b8ff503 SHA-1: 5134c5f1bc91686466526aa5b3066f8bba76115e SHA-256: 9a80e324f9a41e2e05810e8808a6757f820ace9558850c239dd2046acd816426
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 identified as Equation Editor. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This technique is commonly used to deliver secondary payloads, making the initial document a likely 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: 9e94069950b1965deda4f0fb2c7f94b89c0394cde0557cab9ec16b43a98be5eb
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1773 bytes
SHA-256: 806190ec90b8bea07a82feba62602ba29d6f75c2ffca0dffad928ce685dc9b0d

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