Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b3f7059c2fc14a89…

MALICIOUS

Office (OOXML)

348.7 KB Created: 2021-07-06 08:24:03 UTC Authoring application: Microsoft Excel 15.0300
MD5: eb68dfd0634418410c6a3034ae9bd39e SHA-1: 99bd4995440e58779245f411e1bc698777eed1e2 SHA-256: b3f7059c2fc14a89a790e0f5bd3260a1110bf02c05f5c5dcfdb0e1212e0bc36e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a malicious Microsoft Excel document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. The embedded object is the primary indicator of compromise.

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
1f56a127de2b8d5e4e7f4b139f5b28ab834fa977041d4790cc5e9121119a5b2e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
4caa49075df373b926868a4516809aaacf531d0183a045fbd8e457968868a4b0		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NATIVE 1850 bytes

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