Office (OOXML) malware analysis — malicious · ba44809694da0e38

MALICIOUS

Office (OOXML)

1.39 MB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300

MD5: 0a6526be16684a3ee837d1b61d2aa01b SHA-1: 60c38c3856dda0cbad3ee59a0b86739a64536935 SHA-256: ba44809694da0e3832a4deca9bb31e6bb1357c46fe59e6123667073fa11fd4a4

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded Equation Editor OLE object. Heuristics indicate this object is anomalous and likely carries a payload, specifically exploiting CVE-2018-0798. The embedded object's native stream exhibits characteristics of a malicious payload, suggesting it's designed for client-side execution.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/ucIF3dB6F.KQKxBc 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` `76fb2553868dfa21b2e400bfcff52825f7f7fe9ccff29030e75262180303cdb9`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/ucIF3dB6F.KQKxBc	1747968 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `6d5b40e617ed8e7b349e62de5c17bbb62bf2acaa049caba103c2dad9d340a31b`	ole-package	OOXML xl/embeddings/ucIF3dB6F.KQKxBc Ole10Native stream: OLe10NaTIVe	1731888 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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