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

Static analysis result for SHA-256 4e680b23c247b8a8…

MALICIOUS

Office (OLE) / .XLSX

734.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 394cf74171c0a1feef1723cc3df2fa37 SHA-1: 42d3f260a6002477bf287f0d74c9168ad49430fe SHA-256: 4e680b23c247b8a8e5231879c0ffc701086ea831fbaae35263d39dff28b704dc
88 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File

The presence of an OLE object related to Equation Editor strongly suggests exploitation of CVE-2017-11882. While no VBA macros were found to be executable, the GetPC stub heuristic indicates the presence of shellcode, likely part of the exploit chain. The file's malicious verdict and high risk score further support this conclusion.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • x86 GetPC stub (CALL $+5; POP EDX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDX)
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
d89154a435229eb7c402005ffc97ea31a8ab9cd40152a4eebb2a5c38fc6ab934		 ole-package OLE Ole10Native stream: MBD006E1883/OLe10naTive 1874 bytes

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