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

Static analysis result for SHA-256 9842a8bfa5f73918…

MALICIOUS

Office (OLE) / .XLS

616.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-03-03
MD5: 131db239740d5b4276b23167471f49a1 SHA-1: 75c5e5e8be7b68aab9942695fe244f9c2351a9ef SHA-256: 9842a8bfa5f739186a1e755e8ebd03cfcfedc30cdeaf425cb2d633599846133e
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.005 Visual Basic

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that the file contains a payload exploiting this specific vulnerability in Microsoft Equation Editor. The presence of an OLE object related to Equation Editor further supports this. Although VBA macros were detected, they contained no executable statements, suggesting the exploit is directly embedded within the OLE object. The file is therefore likely used to deliver a secondary payload via this 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
59d38995022f604539961338704a5083859fda106638fcdcf4fc15f760e311d8		 ole-package OLE Ole10Native stream: MBD00936CF7/OlE10NatiVE 1885 bytes

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