Office (OOXML) malware analysis — malicious · 273862042760d438

MALICIOUS

Office (OOXML)

621.9 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-13

MD5: 7f90ce976392d25e2a462189016741fe SHA-1: d031f7512ba9b0015c39b23852190216986c8884 SHA-256: 273862042760d438235523ad40d62532c150624bad994e6000f5df2e7bf18ab5

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, identified as an Equation Editor object. This object exhibits anomalies in its Ole10Native stream size and entropy, strongly suggesting it contains a malicious payload. The embedded object is likely exploited to execute arbitrary code, a common technique for delivering malware via Office documents.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/0I9cX.c6enu2 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/0I9cX.c6enu2	920576 bytes
SHA-256: `8fe01ea593aa66b08c539c77bba25add63e6978cbb0741ac6e5ed070c85a8bb4`
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/0I9cX.c6enu2 Ole10Native stream: ole10naTive	910371 bytes
SHA-256: `2a913ae5d431c31eb1fd03694949d36f09bed64e749dd114a81e20593997ff56`
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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