Office (OOXML) / .XLSX malware analysis — malicious · 2d121e8ff6900365

MALICIOUS

Office (OOXML) / .XLSX

918.4 KB Created: 2021-03-25 05:02:41 UTC Authoring application: Microsoft Excel 12.0000

MD5: 2afb57b10d31e693e974725bd52ebc97 SHA-1: 95e7e20b597a75d7daf591d64231c2d82fdd61f1 SHA-256: 2d121e8ff690036598893686364431fcb94f9eda08d87d4c4718fc0f3b54a316

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office document containing an embedded Equation Editor OLE object. Heuristics indicate this object is anomalous and likely carries a payload, exploiting CVE-2018-0798. The document body explicitly instructs the user to 'ENABLE EDITING', a common lure to bypass macro security. The embedded OLE object is the primary indicator of malicious intent, suggesting it's designed to download and execute a second-stage payload.

Heuristics 6

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin 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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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` `0dedee7e4a04941bc301fbcab5034328b73c3bdd846774f4a7b45fff5a2b0530`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	938496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `d4b21350d40cc49087669b92900753ef154cd02e2d9ffc9cb8f4219a71024e38`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10nATivE	928382 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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