Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 241417c3832ebbdc…

MALICIOUS

Office (OOXML) / .XLSX

740.2 KB Created: 2023-09-06 22:07:34 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-07
MD5: 00a535ba786b0b48f52d144cc681d71d SHA-1: d1d9b9a258549fc5cf37dad4ba69f880cac52e48 SHA-256: 241417c3832ebbdc63cd1be559b4b4d33c2a0faf1c62457accfcaccd05b83528
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an XLSX file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and an impossible declared inner size, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This indicates the file is designed to exploit this vulnerability upon opening to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Qk.5svw7ry 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.

FilenameKindSourceSize
ooxml_oleobject_00.bin
bdd1232df860437abf9a2cd09b3b5816a9f98cd99d44ca1c6ebae574ffb58b54		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Qk.5svw7ry 1004032 bytes
ooxml_oleobject_00_ole10native_00.bin
242a2db0e6346b015255484e13da425ee8a459de92d678da00f3a563fdeba592		 ole-package OOXML xl/embeddings/Qk.5svw7ry Ole10Native stream: OlE10NAtIve 993439 bytes

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