Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 9e2624e13a111f07…

MALICIOUS

Office (OOXML) / .XLSX

814.7 KB Created: 2021-08-09 02:12:21 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-07-11
MD5: 80c735c7a08fb93c388c1ecf9caddf9a SHA-1: 79fcdfaa6781db2d11a7b0b74aea3bdd54916028 SHA-256: 9e2624e13a111f075ec7b8f0f66252a1addea512fc7704198bca0515ba7590d8
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate exploitation of CVE-2018-0798, which allows for the execution of arbitrary code. The Equation Editor object contains a payload-like Ole10Native stream, suggesting it is used to deliver a secondary malicious component.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/27cIO.sAARyk3 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
3de2c21121fe64990b43bfa49576c0bf94c9e6e776d76c6a0236d1445e0ffc4f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/27cIO.sAARyk3 1144832 bytes
ooxml_oleobject_00_ole10native_00.bin
1868cdfaa0d487a4fb4e7e013d51dca3e1be5a02a3fa85c248b12994aae33afb		 ole-package OOXML xl/embeddings/27cIO.sAARyk3 Ole10Native stream: OLe10nAtiVe 1133403 bytes

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