Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6c5f6cc894f25f4d…

MALICIOUS

Office (OOXML)

17.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2020-02-04
MD5: c0a6ea32faddb513aae8f2be3731f23a SHA-1: ac37163a73edd03800982335c1e40254f9768f62 SHA-256: 6c5f6cc894f25f4dab23323b9c0b9575559f37f813e544d7bfa1512ed5917f9d
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: f41ad797b5c3009182ae6e921b1d119a31cc3a3b2aae2d2624b310f2e9b43986
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10naTiVe 2009 bytes
SHA-256: 7de33a0ae35f4f3343c3c11080e0e919a8c581a586f3481a52335cdd2c7b1dfd

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