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

Static analysis result for SHA-256 e289cb16419456a3…

MALICIOUS

Office (OOXML) / .XLSX

654.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: f2845528d319703af150f640de5f230d SHA-1: 9ad39e57eda49477530e19788ddc78d12f5046f0 SHA-256: e289cb16419456a33c01d94fa8d2619127d63db76a171e6d4ec84350b28a52c5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office Open XML spreadsheet 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 size, strongly suggesting exploitation of a known vulnerability within the Equation Editor component. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ORe.l6 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
d92a30147fb27fda35db8dc2590284daf32cffef56db6634cc6cfb0ec78cde08		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ORe.l6 898560 bytes
ooxml_oleobject_00_ole10native_00.bin
c89b4b7e1cb34ea0862869eac7a2a0b05711d9b9eefc07f51eea66d185bc596f		 ole-package OOXML xl/embeddings/ORe.l6 Ole10Native stream: Ole10nATIve 889316 bytes

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