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

Static analysis result for SHA-256 1d8ee87b99cc913c…

MALICIOUS

Office (OOXML) / .XLSX

14.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 7870fcd071205d01650b5e29fccd6766 SHA-1: 5568af05b3424805256fb5b9cfabfcc54baf9ea7 SHA-256: 1d8ee87b99cc913cd169d74f33fbd97f7996868916facecafc6664876f8e51b7
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, strongly suggesting exploitation. This points to a delivery mechanism leveraging this known vulnerability to execute a malicious payload. No scripts were extracted, and the document body content appears to be unrelated logistics data, providing no further clues to the specific payload or intent beyond the 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
0ee97be7235a02cfabb5872da2ee51c87989842002282644961dde9dcaf50f3e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
fed93295f3e648db09eaa7a12e6024adbb56b8540f29dcb09aac15fb75667008		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10nAtIVe 2079 bytes

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