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

Static analysis result for SHA-256 e3224037f5bbbbd7…

MALICIOUS

Office (OOXML) / .XLSX

658.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-07
MD5: 81b19a82f241b95060a79fa11f17333d SHA-1: 47d08180c218d104553a2d72fe644b5116b98e2f SHA-256: e3224037f5bbbbd7b8e98a2e21707bcbdadbb2d9e2e2709b4c9612d05f50ba55
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via a spearphishing attachment.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/IlchGA.zT 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
af5c1c7e5da2fd570ee113fdf47a85ea71c3b43dc63c9027d5cfcaf9994927f3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/IlchGA.zT 916992 bytes
ooxml_oleobject_00_ole10native_00.bin
c343bf0a888eeffbca534b24220dab0c58a47257fa89a3215dc4899d99ae9b23		 ole-package OOXML xl/embeddings/IlchGA.zT Ole10Native stream: oLE10NatIve 907337 bytes

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