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

Static analysis result for SHA-256 c49d726731022ab7…

MALICIOUS

Office (OLE) / .XLSX

737.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-07-10
MD5: 9ab14b0b1ad5e9674bfd89444a5fe3b0 SHA-1: 6b4085d3c6bf95ab9f3bd07f119faaa7fbb30ff0 SHA-256: c49d726731022ab7068201cf4f4a9d4462e897a2527f4c978461289c208438c9
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for the execution of arbitrary code when the object is processed. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the Equation Editor exploit.

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
e85dfffeb6effcb00ddeedb9a1d85d6c478a7af356e66134c0567c02dd75b232		 ole-package OLE Ole10Native stream: MBD000C793C/olE10nATIvE 1551 bytes

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