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

Static analysis result for SHA-256 10a6e6bcc54c606d…

MALICIOUS

Office (OOXML) / .XLSX

24.0 KB Created: 2020-08-28 06:19:51 UTC Authoring application: Microsoft Excel 12.0000
MD5: 591ae1a059336e926b018a576899c536 SHA-1: 6fbeac10881d106e95117898b594fa6f04a1f5a7 SHA-256: 10a6e6bcc54c606d63d23045eb5d2b78b0c5c001f2eae9fbab22f868fe82d20a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded Equation Editor OLE object. High-severity heuristics indicate a likely exploitation of CVE-2018-0798, which is known to allow arbitrary code execution. The embedded object's native stream exhibits anomalies consistent with this vulnerability.

Heuristics 3

  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
beb169fda8e09d86fc90ffbcd1b1af6a3d9e3d8223ed7d0c1f837344737fe1ea		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
03560fa6a88344c6dfa27415cde3c9c9b5924f1ee57ed5c78ac2c0a824e513a1		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10naTIvE 1700 bytes

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