Office (OOXML) / .XLSX malware analysis — malicious · dce8f0aaf7d028bb

MALICIOUS

Office (OOXML) / .XLSX

687.2 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-06

MD5: a8c54e715de258989171a7c9169a5830 SHA-1: 6fc5085beddcea87ccd3e7bde1cbba4f29853a2c SHA-256: dce8f0aaf7d028bb28f44d67abe35ded5e20d00a8087ca2b7e4be323d1af39d4

100 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file contains an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this object carries a payload-like stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/kvoo5qUf.nTTVl 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `b80ca3ef78829ed2eba983a58a091af2f5511fe2dbb508e7148018d44b665712`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/kvoo5qUf.nTTVl	981504 bytes
`ooxml_oleobject_00_ole10native_00.bin` `7550df3ab9348388323ee48fc7f39f8a8dda8cbd070b63ce74ad7d91de470376`	ole-package	OOXML xl/embeddings/kvoo5qUf.nTTVl Ole10Native stream: oLe10NatiVe	971647 bytes

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