Office (OOXML) / .XLSX malware analysis — malicious · a47c0d2b2a0cc81a

MALICIOUS

Office (OOXML) / .XLSX

16.9 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000

MD5: c6bc7c815b2275cf6a2d07cf9bcff3bc SHA-1: 6af6a4b3c3c28545507d6b615eb0362106c036ae SHA-256: a47c0d2b2a0cc81ad38471f8fe1386123f4e2c316fc1e0fa366527ba6d3079af

102 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. This suggests the document is designed to leverage this vulnerability for initial execution of a malicious payload. No scripts were extracted, and the document body contains what appears to be a parts list, which is likely a lure.

Heuristics 4

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 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` `27264c38ea47469d1ec19b07a3692621ae69d84e11dc757fe13a82033317ab0e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	10752 bytes
`ooxml_oleobject_00_ole10native_00.bin` `48c9a594a99bdf25163f7ab49d29964bf9a0d4864e7d33be33b726ac34a8819f`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10naTIvE	7983 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.

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