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

Static analysis result for SHA-256 e38194a13643034f…

MALICIOUS

Office (OOXML) / .XLSX

671.8 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-05
MD5: 01bb514911db60fc31f6d69386da3d38 SHA-1: 68ac1d999b1b5502033ec4fa861c128098cb64af SHA-256: e38194a13643034fa727116587c3468a164c6e888771d6d98e8f14cf7de57835
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous size, indicating it's likely used to exploit a vulnerability and deliver a second-stage payload. The presence of the Equation Editor OLE object and the anomalous stream strongly suggests an exploit attempt.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tw.5Fpa 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
c7749abb75e19c1b4c4a6de2c57603c45e3839256f217e1c31a606a91c6d23b6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tw.5Fpa 944640 bytes
ooxml_oleobject_00_ole10native_00.bin
5b48a594157220c3800cf53983fa0e836d92e1720964230697554edc8fe59f23		 ole-package OOXML xl/embeddings/tw.5Fpa Ole10Native stream: OLe10natiVE 934542 bytes

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