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

Static analysis result for SHA-256 762f856d6eaf5d2c…

MALICIOUS

Office (OOXML) / .XLSX

713.6 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-05
MD5: 0a6f9a6de80ce6a762dc57f5fa018016 SHA-1: f6a492babdedd0617f85667677888c030e3c6615 SHA-256: 762f856d6eaf5d2c590d31c123850bf793735d6dcea1eb7d78933e518570e392
140 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit vulnerabilities like CVE-2017-11882. The presence of a NOP sled further supports the exploitation of a buffer overflow vulnerability. The document body is obfuscated and does not provide direct clues to the attack's intent beyond the technical indicators.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/HvKoDb.OscDd 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
e4e06b48010b27d52b57b65b740f4e5550adf924a9cd0c468c92832810594433		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/HvKoDb.OscDd 999424 bytes
ooxml_oleobject_00_ole10native_00.bin
946d945eb01f414aab31efc29d03d2ec9828b7bde8408326d3706c9510aa06ca		 ole-package OOXML xl/embeddings/HvKoDb.OscDd Ole10Native stream: oLe10native 988997 bytes

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