Office (OOXML) / .XLSX malware analysis — malicious · 09e705038fc2adf9

MALICIOUS

Office (OOXML) / .XLSX

2.10 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000

MD5: 0a1a6cc3ea4a4deb70335c511f9aa6dd SHA-1: cefa374465e3b5b18a9ad19246f46a949ff04f9b SHA-256: 09e705038fc2adf93f4790d3f91f7044ae61fc3eadc7a50f51cf7218db28ff6b

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate anomalies in the native stream consistent with exploitation of CVE-2018-0798, suggesting the embedded object is designed to execute a payload. The presence of an embedded OLE object and the exploitation of a known vulnerability point to a malicious document, likely delivered via spearphishing.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/GbCvrhX.1wrT 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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `9c295b81cf7026d359fae2da29277af62b1f40a8d2f4f787562756024693b21b`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/GbCvrhX.1wrT	2457600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `6d6aec774a65b92996c65aa500de52b5dee0ae2aaa5aafe134cca3eb318b57ad`	ole-package	OOXML xl/embeddings/GbCvrhX.1wrT Ole10Native stream: OLE10NativE	2436081 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.