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

Static analysis result for SHA-256 46dfb556f8e7c5e0…

MALICIOUS

Office (OOXML) / .XLSX

673.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-30
MD5: 50b113cc75d3c2f6d95ca66f04f348a5 SHA-1: 05e3c61190180b3afe010f2832b621b46cd91adb SHA-256: 46dfb556f8e7c5e0c80eaeb3bb0c6bf1992b8864d467e99a26f25a2a345d8bee
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to execute malicious code. The document body presents a fake purchase order, likely a lure to trick the user into interacting with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/qP.xM 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
162e8f95eb0c53b29099cbfbae67f5d24a546bc83ff8fc7023bf9276b359386c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/qP.xM 987648 bytes
ooxml_oleobject_00_ole10native_00.bin
ac4959fb1163d419d8db349bbebb64986ecf74f77b2cefb707f689bfd4160987		 ole-package OOXML xl/embeddings/qP.xM Ole10Native stream: olE10NatIVe 977275 bytes

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