Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 16b1d0cbb8eb4804…

MALICIOUS

Office (OOXML)

684.5 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-06-13
MD5: badd03190784a6b9d067f2f7ff309a20 SHA-1: 5bb5f2ca6419e2ec079d3b24f708f393a431196a SHA-256: 16b1d0cbb8eb4804ccedaed0abd454606f0d237abe3d4f8ac212ff3a027270c7
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/D345ngN.Kn8cYka 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/D345ngN.Kn8cYka 963584 bytes
SHA-256: 0d596337fedd8977fb045ad601260f9e59cd1ffa13c756242f7996c1ec4bd7fe
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/D345ngN.Kn8cYka Ole10Native stream: olE10NaTive 953617 bytes
SHA-256: 855928079b7ddfd8b890ce001319436b280ea427ec2ee9cd94325279bd7ef8bc

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