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

Static analysis result for SHA-256 aa8eb27526890c87…

MALICIOUS

Office (OOXML) / .XLSX

691.5 KB Created: 2020-05-18 06:42:12 UTC Authoring application: Microsoft Excel 15.0300
MD5: 9d9457008273640242436058ce4e7776 SHA-1: d6480702be418ae420bfc28f2c885078cb2aec0f SHA-256: aa8eb27526890c8719debfad46145dd7ed9e220fac49c517bd042b667fdd1cc8
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a critical vulnerability, CVE-2017-11882, which is a known font record overflow exploit. This vulnerability allows for the execution of arbitrary code, likely to download and run a second-stage payload. The document body content appears to be a fabric booking chart, which serves as a lure for the exploit.

Heuristics 3

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/e0Ag5CLBm.hDZ contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
91cfee4ceee972aff3b144afcc54b078407aa128c280aa58d9bbc3c6ad966435		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/e0Ag5CLBm.hDZ 887296 bytes

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