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

Static analysis result for SHA-256 e0cfe6f2010622b4…

MALICIOUS

Office (OOXML) / .XLSX

756.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-05-19
MD5: f66022adc913f67af22af6f928ecf79b SHA-1: 33bc550547eb9647c97d8078cb058ea28a71731e SHA-256: e0cfe6f2010622b4712728ce00b9086ec4a498716a19647bd9de9905a8779a66
100 Risk Score

Malware Insights

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

The file is an Excel document containing a high-confidence OLE object that appears to be an Equation Editor exploit. The embedded OLE object, specifically the 'Ole10Native' stream within 'xl/embeddings/wMrHi.rl0', has an anomalous header and a significantly larger declared size than its actual stream size, indicating it likely contains a payload. The document body is formatted as a purchase order, serving as a lure to encourage users to interact with the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/wMrHi.rl0 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
d0593c45449a9a1d2fe5b533f6559126e097e38a1b7d16051e825784d2de3c39		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/wMrHi.rl0 1020416 bytes
ooxml_oleobject_00_ole10native_00.bin
aeb6b618a74fbeac17423156d952e800ba60805b601046f6beb4db11bf435448		 ole-package OOXML xl/embeddings/wMrHi.rl0 Ole10Native stream: OlE10NaTIvE 1009874 bytes

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