Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 77c39e46e5526118…

MALICIOUS

Office (OOXML)

11.0 KB Created: 2019-01-14 17:17:08 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-07-24
MD5: 9973c2ec81eb9b1c05531967980efc57 SHA-1: d0f5fff9fdf0f0130cf2bc204f1217962fba51eb SHA-256: 77c39e46e5526118cd623f6ec16a1660d870a051c589c26f21aaa4ce8096acec
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, a vulnerability allowing for arbitrary code execution. The document body contains what appears to be tabular data, but the primary malicious functionality stems from the embedded exploit. No scripts were extracted, and the family is unknown.

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: e7c9b53a34dc8eb967bf02770c51275570045c41b6c5dd25d557c4d645e7eb67
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10naTiVe 1757 bytes
SHA-256: 61c790f40d28b2ffa00f2b49aa1b9a11d4490deab1f9342b95c81ed66929501e

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