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

Static analysis result for SHA-256 86e5490c033b875a…

MALICIOUS

Office (OOXML) / .XLSX

708.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-25
MD5: 8f38500c358911dc3f37dc37296c0d8c SHA-1: 597cd9deb6cdff0ebe53aadd05e16cd0f26111ce SHA-256: 86e5490c033b875a3c4380c0e4dd291b037438f11d2818977416cf313c8ee08a
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream, indicating it's designed to execute malicious code. The large size difference between the declared inner size and the stream size suggests potential obfuscation or a packed payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Cp.bD contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
69a99393db2f9e06b014ce21b6f49915e41f73fdeb75f8d585076b3cb12aec33		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Cp.bD 964096 bytes
ooxml_oleobject_00_ole10native_00.bin
f73737e743058f923223cf8fba191f453e50ae19cc7240900bc1fb0e1ac3316e		 ole-package OOXML xl/embeddings/Cp.bD Ole10Native stream: OLE10nAtIVE 954167 bytes

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