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

Static analysis result for SHA-256 c1d125239b37b1c7…

MALICIOUS

Office (OOXML) / .XLSX

679.0 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-05-02
MD5: 41f4bf78a44711a11098c3e1f7e06278 SHA-1: 8981199376ff52ecf505f8b533930510bdbe6e29 SHA-256: c1d125239b37b1c7739b907cd0347d97fc8d896f8bb07bee17fb4eac03458618
140 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically an Equation Editor. Heuristics indicate exploitation of CVE-2018-0798 due to anomalous native stream properties within the Equation Editor object. This suggests the object is designed to deliver a malicious payload, likely exploiting a vulnerability in how Equation Editor handles its native data stream.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Hdb49NX.F3vtt1T 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.
  • 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
bddcdc29ad76868f9aa8210daba6e0cdfc06f5a60b443966f154ff89457421b6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Hdb49NX.F3vtt1T 907776 bytes
ooxml_oleobject_00_ole10native_00.bin
cccc14a2b50866eba8b21cc58246b66eea784516aaf5072fa7256ff464142c47		 ole-package OOXML xl/embeddings/Hdb49NX.F3vtt1T Ole10Native stream: OLE10NaTIVe 898254 bytes

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