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

Static analysis result for SHA-256 bc91ccbd2dc0c662…

MALICIOUS

Office (OOXML) / .XLSX

13.6 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-30
MD5: 71e84be67ea92536b312053ad6069da1 SHA-1: 73f177414cc4561f8171a9b76e19b6f73df86295 SHA-256: bc91ccbd2dc0c662d4ad79eced7bf019ab2419458ca9bf80901d3edac71ad63b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous native stream data. The presence of a lure to enable macros further supports the malicious intent of this document, which is likely to execute a secondary payload.

Heuristics 4

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
ccc321aee68c1a274bfe0728f693e94c49245ce3759e7f3f3576e27723b0afcd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
4439176d01820afec717598a96ef4647ea8a6c0a64bc70a5a816e34982c6f167		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10natIVE 1577 bytes

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