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

Static analysis result for SHA-256 45dac3db5b082fac…

MALICIOUS

Office (OOXML) / .XLSX

618.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-09
MD5: 40cb01bd99edf0614f8be3e9542094ff SHA-1: 3734c5d339f75edc81f4b8ec98fa36eeeb8d6433 SHA-256: 45dac3db5b082fac321c97c287d55646db1f41acd79ca7bb6fe7016bacdc2cd4
100 Risk Score

Malware Insights

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

The sample is an Excel 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 size and header, strongly suggesting exploitation of a known 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/OHjA.7pTe 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
64c913a20c2f10c68fea07675688af68c61d3a4437492ce7c11ef59a88f941f8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OHjA.7pTe 848384 bytes
ooxml_oleobject_00_ole10native_00.bin
fb01859b7059582e7c7292a57e806cb3e803a9a7797ae207ffaf29ddba1be686		 ole-package OOXML xl/embeddings/OHjA.7pTe Ole10Native stream: olE10NAtIVe 839675 bytes

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