Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 75918a7767aca800…

MALICIOUS

Office (OOXML)

853.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-07-10
MD5: ae989c3e76b0f747bd271197c98f5fdf SHA-1: f40e7d399401b750a90550ba19faec7bbc204a32 SHA-256: 75918a7767aca8000ed888af58b853104f3f741f7b1e54a94cf4d32a03d6966d
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/ZfuhBuAC7.g2gNLV 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/ZfuhBuAC7.g2gNLV 1152000 bytes
SHA-256: 87bf872d5f0f1f31a919fbee6c2ea33c9ae95481ea50872c314ed92d18aa1ab4
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/ZfuhBuAC7.g2gNLV Ole10Native stream: Ole10NAtIve 1140270 bytes
SHA-256: f9b53971fd98f42978e42982636c2d9ef3a8765de26239f5460f7e41791f39e2

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