Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d43fde99529c2bee…

MALICIOUS

Office (OOXML)

657.9 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-05-23
MD5: dcef9407943db279c517970b2685f1a6 SHA-1: 78f62b03ddbe9fd4c37839e4fff51fba0ba07027 SHA-256: d43fde99529c2bee7a127179e9282d4db3edd5c0bae3674a3a3ab8f0ffba2c19
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains an embedded Equation Editor OLE object that exhibits anomalies indicative of CVE-2018-0798 exploitation. The object's Ole10Native stream has an impossible header and a declared inner size far exceeding the stream size, strongly suggesting it contains a malicious payload. This technique is commonly used to execute arbitrary code on the victim's machine.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/JDMlmv4.GdfaWZ0 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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/JDMlmv4.GdfaWZ0 957440 bytes
SHA-256: 1f87e1b337a06d17cabaaa878eabab45d0cee665b8b5910e67860a9e5ac4cff3
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/JDMlmv4.GdfaWZ0 Ole10Native stream: Ole10naTIve 947676 bytes
SHA-256: 43e0b1c1c9dc029204fa5edcaaf0b25dfe138c30bef4d4c0488a45e52bb79336

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