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

Static analysis result for SHA-256 63dddf6447cfc2dc…

MALICIOUS

Office (OLE) / .XLSX

243.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-02
MD5: 629f224de3f8749c4fc045d94c3fb789 SHA-1: 02e472326d746ec05fe4d11ecad812f8738eb437 SHA-256: 63dddf6447cfc2dccc29bd9e1e862e112bef2df4dc9640f972e777c378e220e0
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample contains an embedded Equation Editor OLE object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is rendered. Although no VBA code was found to be executable, the presence of the exploit object strongly indicates a malicious intent to compromise the user's system.

Heuristics 3

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • 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.
  • 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
0d2c441cc61b8e80e493bb354ea029c28e8f4ea7442d9fb2f1be6938823d7771		 ole-package OLE Ole10Native stream: MBD0058D959/olE10nAtIVE 1523 bytes

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