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

Static analysis result for SHA-256 95e580d3fd668dca…

MALICIOUS

Office (OOXML) / .XLSX

725.3 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: 088fb6348df56679bf0dec9e9a7f910b SHA-1: 017d9b0272ef35d8dc5d2dc90b9c85c9240652a5 SHA-256: 95e580d3fd668dcacf5ecb57f32e5116512c711c36d4f09e9b1cd89a568589eb
140 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, suggesting exploitation of a vulnerability within the Equation Editor component. The presence of a NOP sled further supports the likelihood of code execution.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Au04WD6x.KCkJy30 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
286f68d0e9e29f1b30cf9aa19d1ec05ad83fe9bcfb75cab5c324dc39c1c4e142		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Au04WD6x.KCkJy30 1008128 bytes
ooxml_oleobject_00_ole10native_00.bin
a65b9989a819f263d3ce7722194d7ed5bb011060a8a0d321334676647a930e9e		 ole-package OOXML xl/embeddings/Au04WD6x.KCkJy30 Ole10Native stream: OLE10NaTiVe 997424 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.