Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9d12109e80cdd2c6…

MALICIOUS

Office (OOXML)

818.9 KB Created: 2021-04-28 21:02:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-13
MD5: 2786ffa9dce20f2f0fe2b4c3bdd6a8cc SHA-1: 017b22ed1197e6bbcb24fceb83b252a0929dd058 SHA-256: 9d12109e80cdd2c6db2f28a553c35902ae37c171b6d3938f4c20825780de584c
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/EdUDml09l.V7mDtKI 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/EdUDml09l.V7mDtKI 1048064 bytes
SHA-256: 435b6d5edf5126818cb514cf932de310a7ad07fe6bcd067701d3e272e795f630
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/EdUDml09l.V7mDtKI Ole10Native stream: Ole10Native 1037326 bytes
SHA-256: 50c6a3c0f19f67f7985686813fdbbdf9568a989f5d7d19ac67cd9fa9688e1f57

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