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

Static analysis result for SHA-256 06b88c0d4ed1b1a5…

MALICIOUS

Office (OOXML) / .XLSX

689.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-29
MD5: 050980027226d96b4cd2c5273f9d6bdf SHA-1: 005289ff3c1f0ae76ac0d6b64ca399c610681249 SHA-256: 06b88c0d4ed1b1a5fef2598f97f52bde47a447747c2541fc090383c613461d12
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits an anomaly where the Ole10Native stream appears to carry a payload, indicated by an unusually large declared inner size compared to the stream size and high entropy. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/wVM724.Th 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
8832e4be65c4e4a37be4db63b9931f16f248fcac8a73554291b75d92cf517e43		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/wVM724.Th 934400 bytes
ooxml_oleobject_00_ole10native_00.bin
a9304eeec55c5f2c2a1ba23d2d2d011ad465dd686d7545e4d2317268be879ba8		 ole-package OOXML xl/embeddings/wVM724.Th Ole10Native stream: OLE10NATivE 924213 bytes

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