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

Static analysis result for SHA-256 e08362c906779edd…

MALICIOUS

Office (OLE) / .XLSX

169.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-19
MD5: ff779cf4cc024a3e73b963b2564ba782 SHA-1: de9941428d4d020a4352c47e94926861dbb32c95 SHA-256: e08362c906779eddf159e006cbe7af9977f55c26f4940ce0d0f5a7eff541416f
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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

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
106eca6412d706f68b9ca49b479a4b14de47cea47b9b878470f25d76e4158187		 ole-package OLE Ole10Native stream: MBD004A0E04/OLE10nAtivE 1337 bytes

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