Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 747cd12c858c2a19…

MALICIOUS

Office (OOXML)

37.3 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-05-23
MD5: 462c73ef281ca6b065c9e7c4836c12f4 SHA-1: 02c2e8542fa09165fec9dac0270409cde16e9419 SHA-256: 747cd12c858c2a1954b587818144325f51d0d1c7acf71f61943fbdd6593e1959
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object that exploits CVE-2018-0798 in the Equation Editor. This vulnerability allows for arbitrary code execution when the embedded object is activated. No further stages or IOCs were identified in the static analysis.

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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
SHA-256: bdfc1009d779ac10c728c1aa39cad9758b2b52a5ea33b510c6d0c7f455715db3
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10natIvE 1421 bytes
SHA-256: 32de4dda0b48eccaaf00ffea9626d8e3f1525beaceee19a1a536b71e51cdfd45

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