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

Static analysis result for SHA-256 ee24513d0d877950…

MALICIOUS

Office (OOXML) / .XLSX

714.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-08
MD5: d72b20b6cc123f7346b187cea4fbf9fe SHA-1: f73db959d98207bb27c58c0506c371a063eef11a SHA-256: ee24513d0d8779501a57edee4bd09b4e62868af2003ba1d9d019693d05918f2a
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting it contains malicious content. The document body, formatted as a purchase order, serves as a lure to encourage interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/KiJ.00dqAgM 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
d5eaf5e77bdb2e5ca7b4ed06f1c8ecfe3cc95e23245bb161af2c64e360d0b4a7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/KiJ.00dqAgM 1029120 bytes
ooxml_oleobject_00_ole10native_00.bin
4a3032232a86840c9a8fec017b6c8337ba3523f1f2a1fdc29f9c4be5b6b3753d		 ole-package OOXML xl/embeddings/KiJ.00dqAgM Ole10Native stream: OlE10NaTIVE 1018630 bytes

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