Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a7a30782d9932ba9…

MALICIOUS

Office (OOXML)

19.4 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-10
MD5: 0d677045d8dae96b41e5663d2c93569a SHA-1: 0eb4c7c0bf1ba168da4d73e422cf55c09c8d1a5a SHA-256: a7a30782d9932ba994966fbe0732cd3f380d9178aea1f109067c391fd5dfc12d
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This is a common technique for delivering malicious payloads via spearphishing attachments.

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: a283d217896ade46245c7acc2ef1b3fc9f45466977f299b4a642fadc1a2f221f
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10naTIVE 1759 bytes
SHA-256: f0dfb2305193cc7ebb8738760967b0897470ede37e81452fcb34aa4082a07621

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