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

Static analysis result for SHA-256 fcc8fe7a25a3a658…

MALICIOUS

Office (OOXML) / .XLSX

13.8 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: b2541705c0bc6d41597696f182b1a3e3 SHA-1: 06e930b36e21bf8a8b21100b18f54be5d37eaf35 SHA-256: fcc8fe7a25a3a6584466fb7dbd56cb3691b5e12d04823594f32cf4680d98303a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.001 Component Object Model

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. This suggests the document is designed to leverage this vulnerability to execute a malicious payload, likely a second-stage downloader or exploit.

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
e57efbb57f95e85bf7e2e907d82ea60e7efa17b7cf442a920bde5dc378030228		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
7331e1a4b9bf1e41aaec62dc7be543b997a48cd1153f611a38d658aa28916cb4		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NAtive 1771 bytes

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