Office (OOXML) malware analysis — malicious · c6ebdf31b200af9f

MALICIOUS

Office (OOXML)

652.6 KB Created: 2020-01-08 16:45:10 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-05-23

MD5: adc2076afc695aabdaab064893dc2be1 SHA-1: f1036f0ed39800c0b6406d2ebffd50fcb85b6ce6 SHA-256: c6ebdf31b200af9f6b10922495990d1817478bd53c467d098aacbaff2a3479c6

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation. This points to an attempt to execute arbitrary code via the Equation Editor vulnerability, likely delivered as a spearphishing attachment.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/IDw.WZ2K6k4 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
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 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/IDw.WZ2K6k4	955392 bytes
SHA-256: `fe950aa27256a279e8db781dafe339468d03afbabc41440b5fa57f80ac8b3ce1`
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/IDw.WZ2K6k4 Ole10Native stream: OLE10NATIVe	945286 bytes
SHA-256: `652d610c652071c6a70482143a685f6e48ae834f7e56f9289ed727cca8d6baa3`
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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