Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 094783dd39ef399b…

MALICIOUS

Office (OOXML) / .XLSX

12.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 9901252027f32eb7022dbae4aa2e14ec SHA-1: e06f60c23cba53a6ee74e4472119b52f74cf6567 SHA-256: 094783dd39ef399b32836b7f1777f547ff62892552f0dbc9924dcc40f3a7068a
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 an Equation Editor object, which is known to be vulnerable to CVE-2018-0798. This vulnerability allows for arbitrary code execution when the object is opened. The presence of this object strongly suggests an exploit targeting this CVE. No specific malware family could be identified, and no network IOCs were extracted.

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
5f1472761fb837e19b497093437cc882c530570dea7890cf4186eedbf8780336		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
9cdd2f9fcda47fee018afb69ec175fd157b54f3a3438eef3d8374cb3fb014657		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10nAtIve 1555 bytes

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