Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a6fdf9d990f492bc…

MALICIOUS

Office (OOXML)

938.6 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-06-17
MD5: aa02befcd6e0fe58612283bb9fb7a155 SHA-1: 9ffba1ef8d74f9d0ac6c7fbdfcb946a288c314b9 SHA-256: a6fdf9d990f492bcc8e28ad6d9e85ae9688c041e07ef39e7c5fd23f1b64e12ad
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/H4.qePyQ 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/H4.qePyQ 1291776 bytes
SHA-256: 89707020e7be9bf6e0bce5d42cf69e5ef2707386dc7bcfaf0699eab078e0ec4b
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/H4.qePyQ Ole10Native stream: Ole10NAtive 1279449 bytes
SHA-256: b918bbdf4bea5c50c0a8b323ae1027ea1a01cd7d7d087d41025c2d30749a0a25

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