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

Static analysis result for SHA-256 5791d04fdf07480a…

MALICIOUS

Office (OOXML) / .XLSX

2.15 MB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: 45ef155ace35ba20e3b2065f9c0abaea SHA-1: 2adff79d97833eeabdc08a4f5c465845f48897e4 SHA-256: 5791d04fdf07480a6fd8c2e09e9ab6ca5b12dc1e112a8218f280367f7f7ef607
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a NOP sled and a lure to enable macros, suggesting it's designed to execute malicious code. The presence of an embedded OLE object is a common delivery mechanism for exploits targeting vulnerabilities like those in Equation Editor.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ik.i5o1 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
877571fcd043f93a26a8da96433239d4a86eec6c4882a7d2d03134e9284f6bb5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ik.i5o1 3068928 bytes

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