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

Static analysis result for SHA-256 1daf66caadb5caa8…

MALICIOUS

Office (OOXML) / .XLSX

688.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-30
MD5: e7d8826047b8ced9cd05c8e07cf30826 SHA-1: eb0099d2afdf52c0d33ef006e094ef9f082d0304 SHA-256: 1daf66caadb5caa815f0f483f5cfc9daac5951746ad16025da765662723c366a
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/QHHZzI.lOR8V 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
5c8a1fe433866d8678966eaa53f4e1c04814d82536d9cc693ea85ce7d50a966b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/QHHZzI.lOR8V 934912 bytes
ooxml_oleobject_00_ole10native_00.bin
b0e79112c2f866f06ba146725a283ea519beed6490cd998e647a679f686806b3		 ole-package OOXML xl/embeddings/QHHZzI.lOR8V Ole10Native stream: oLE10nAtivE 925141 bytes

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