Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c84a3852e99c9c63…

MALICIOUS

Office (OOXML)

689.6 KB Created: 2011-08-17 10:24:39 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2b0e9603e4b2a876e51db2d33ec743cd SHA-1: a1e68101f4d4901bdccbb6cf11c10008dcaed5fb SHA-256: c84a3852e99c9c632f8b898d1514c126171742415f3affce305b7c2a9d9b7279
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an Excel spreadsheet containing an embedded Equation Editor OLE object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream, suggesting exploitation of a vulnerability within the Equation Editor to achieve code execution. The document body appears to be a construction estimate, likely a lure.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Y9.Ji940 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.
  • External relationship medium OOXML_EXTERNAL_REL
    External target in xl/externalLinks/_rels/externalLink1.xml.rels: /Projects/Quotations 2021/BSK-21-022 Warehouse in K-28, Trans Lyari, Karachi - BEXIMCO/Proposal & Estimates/BSK-21-022-R
  • 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
6ba9be459655783d944223973ddb29c5ea39402f79a1ec76508b3c5e31279dfc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Y9.Ji940 903680 bytes
ooxml_oleobject_00_ole10native_00.bin
6e39d7c87b37dd0ca4f1d9499b1bdbaae47402835046367066ba4b7159535537		 ole-package OOXML xl/embeddings/Y9.Ji940 Ole10Native stream: OLE10Native 894231 bytes

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