Office (OOXML) malware analysis — malicious · 989ed4c8a01dfc9d

MALICIOUS

Office (OOXML)

16.1 KB Created: 2010-03-19 06:52:37 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-08-04

MD5: 86cb221ea192ff47ba0c3155f64a84e9 SHA-1: 5f96bd44d6ac4b313e6dd6ab627c5f090cc47bb5 SHA-256: 989ed4c8a01dfc9dc399866392c030eba062ff290be0bffdb8dd17e47da4e9cd

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object exhibiting characteristics of CVE-2018-0798. The presence of a 'Macro/content-enable lure' heuristic indicates the document likely prompts the user to enable macros or editing, which is a common method to bypass security controls and execute embedded malicious content. The embedded OLE object is flagged as a potential shellcode candidate, suggesting it's designed to execute arbitrary code.

Heuristics 5

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.
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 medium 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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	3584 bytes
SHA-256: `f9ef156ed8922645abf69292f883e723551d702591cf43ddbc2bcc09e2fdd84e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	1292 bytes
SHA-256: `933bd9d4d1e4873724da998d683f21d5272975f7f346afcdd01cee249689d785`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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