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

Static analysis result for SHA-256 5505eff489cc13f8…

MALICIOUS

Office (OOXML) / .XLSX

11.8 KB Created: 2025-04-16 03:58:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: 4ea60c9955426b51e1e24e244cef1c95 SHA-1: 140489cb16c0ed6bdb35ed90622d74df67eb93b4 SHA-256: 5505eff489cc13f8a2178bd179281e72cfe1c90c97fd5d38e15d20fb7f349b32
120 Risk Score

Malware Insights

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

The sample is an Excel document that uses a lure to trick the user into enabling editing and macros. It contains an embedded Equation Editor OLE object, which is known to be exploited by CVE-2018-0798. This suggests the document is designed to exploit this vulnerability to execute a malicious payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
d33a1773fa57dc964c7905316a23b6d30b531c9b3e49413d6fcafac3a35a259d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
804efcfe44156bc54a9aa271086d6239759f7052c82eb4e2544f7d6f5707e35b		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10naTIVe 1338 bytes

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