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

Static analysis result for SHA-256 ee04145d47ba4cd2…

MALICIOUS

Office (OOXML) / .XLSX

712.6 KB Created: 2023-05-08 10:21:21 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-06-05
MD5: d960d9cf507e2e13538fd76db9db7bfe SHA-1: 0a85d2637ae141042f856bdb523d2dde6c52f2f9 SHA-256: ee04145d47ba4cd2f126450afdc414c6a39da226f463087e2017037674e20a97
120 Risk Score

Malware Insights

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

The sample is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object that carries a payload-like Ole10Native stream. This is indicative of an exploit attempting to leverage vulnerabilities within the Equation Editor. The document body presents a detailed quote for audio-visual equipment, which serves as a lure for a callback phishing or technical support scam, prompting the user to contact a provided number.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ZaZk.NHfaBKM 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
f443835b2ccf2eec765574fbf75854c0715a8b38a4727242120f450a53566841		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ZaZk.NHfaBKM 1025024 bytes
ooxml_oleobject_00_ole10native_00.bin
0a0fd7fe5f4d01a8139008187814c908fd354e6d30583673da204f7846ca4e2c		 ole-package OOXML xl/embeddings/ZaZk.NHfaBKM Ole10Native stream: OLe10natIvE 1014464 bytes

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