Office (OOXML) malware analysis — malicious · 15d8721d56b6bc07

MALICIOUS

Office (OOXML)

20.2 KB Created: 2016-10-11 20:30:46 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-08-04

MD5: dcc3d4be48fd08d16833f3e737efd9cc SHA-1: 94fc63ecf1f90ec2ee263ddd23f204d0fcde5d33 SHA-256: 15d8721d56b6bc070e4e4a7e26878bab9f45f0208b3abaa81c6c4bc4cca7e564

128 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which is known to be used for client-side execution. The document body contains invoice-like text, suggesting a lure, but the primary malicious activity is the exploitation of the Equation Editor vulnerability to deliver a payload.

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
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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

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	4608 bytes
SHA-256: `88a9a5d2d023cd8bdf1d821332be562397c7ed8fa57ecd2579e80ad242ed894b`
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	2160 bytes
SHA-256: `2226a857000f47384508488bcc17114c308b5f1f8235ee61a4440acce97e9314`
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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