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

Static analysis result for SHA-256 2ca709940eafaedc…

MALICIOUS

Office (OOXML) / .XLSX

747.0 KB Created: 2019-02-26 14:42:35 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-07-28
MD5: 1f3623270824a4cf9e03d0efce211e2c SHA-1: 03ab2272600b43748b61a38f4844add1357a0418 SHA-256: 2ca709940eafaedc9003fae388fae466824b03a387ba387643298b0925cda3d8
108 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. This object has a high entropy stream and an anomalous Ole10Native header, indicating it likely contains a malicious payload. The document body contains invoice-like text, suggesting a lure to trick the user into interacting with the embedded object.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/2RIh.2D3pI 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
61d88c2ceb50b59a14924d35f4855be1af584c10d808580b7a72497111c3e121		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/2RIh.2D3pI 1067520 bytes
ooxml_oleobject_00_ole10native_00.bin
d7271157bcadec67da60f2336907bb316c410a483331dfa9db085c53879c422e		 ole-package OOXML xl/embeddings/2RIh.2D3pI Ole10Native stream: oLe10NatIvE 1056745 bytes

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