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

Static analysis result for SHA-256 f965f58357af3be6…

MALICIOUS

Office (OOXML) / .XLSX

12.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: ae2babc4fa4efd52b9ece3c6e90d5fb5 SHA-1: a789b131e94c059cb6989352313836a6eaddb755 SHA-256: f965f58357af3be66525cfb14787661cbb4ccf2d10b5fdd70a95ca0bf02d8d12
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link

The sample contains an embedded OLE object specifically identified as an Equation Editor object, which is known to be vulnerable. Heuristics indicate an anomaly in the Equation Editor's native stream, strongly suggesting exploitation of CVE-2018-0798. The document body contains what appears to be a list of medical supplies, likely a lure to disguise the malicious nature of the file. No scripts were extracted, but the presence of the vulnerable OLE object is sufficient to infer an attack pattern focused on exploiting this component for initial execution.

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
ebbfadba2265fecd51e3a4688c575d775204eead36d26002be8130f783821edf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
5f5fc2b7cdb2699e26ed2b3b2dc67c547cf43074202f9442139c79aa2df33157		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NaTIVe 1525 bytes

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