Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d342e759296da0a4…

MALICIOUS

Office (OOXML)

672.2 KB Created: 2004-09-16 12:33:58 UTC Authoring application: Microsoft Excel 15.0300
MD5: 3cd8aa88a04bed66e00df1810933be1f SHA-1: d2adde33b411422b6bfe035285d3df72e666ff85 SHA-256: d342e759296da0a48f4cd087debfb1792e05233478c42a71a4aca5458cd2f1a5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a vulnerability for client execution. The document body appears to be a form related to property or financial proposals, likely a lure.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/SL93.zzSdW 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
4340ba8aa0cc596d238816df66338291eaf6625e631351c565956f1370c8a270		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/SL93.zzSdW 909312 bytes
ooxml_oleobject_00_ole10native_00.bin
0c7999602573f325231905edc422e5bfb36797bbea0822cf7429690dd01f02d5		 ole-package OOXML xl/embeddings/SL93.zzSdW Ole10Native stream: oLE10NAtIVE 899906 bytes

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