Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 eb071731b78ffc53…

MALICIOUS

Office (OOXML)

604.0 KB Created: 2021-06-06 02:45:23 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-06-28
MD5: fb833c526e044fa550526974ff7ed381 SHA-1: 04c95124c54d61af336c67890a57676852e9e9a5 SHA-256: eb071731b78ffc53f4d9731e3d5606bcb82ce2ab016c394ad668b0bacbc4f916
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. The heuristic OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY indicates that this object carries a payload-like stream. The document body is formatted as a payslip, suggesting a social engineering lure to trick the user into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zwi.eq 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zwi.eq 881664 bytes
SHA-256: 95faea55edcfcf7e8a2a5fbba3acd33e0950510d785952e11722b1c7fd8cc928
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/zwi.eq Ole10Native stream: OlE10nATive 872102 bytes
SHA-256: 73a0da590cae7b1a3b2a92ecb5474f885c3feea4044b9f9d93576887351794c7

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