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

Static analysis result for SHA-256 401fbd36122223b3…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-26
MD5: a19efc534250c89545161087b55ca5ce SHA-1: f0f5687df65da1623ed1b4ade2a6ae12658ec5fc SHA-256: 401fbd36122223b3ced2e77fd9b85d106a03e00a46d3037aa6d2a2e55dba0ac3
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious OLE object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code when the Equation Editor is rendered. The VBA macros are present but appear to contain no executable statements, suggesting the primary malicious functionality is within the OLE object.

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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
5ea4d41245024a9d7ff668240a0e2240dcd113c07283ef426f8dd80e0260b4d6		 ole-package OLE Ole10Native stream: MBD02D7DCB8/ole10NAtiVE 1736 bytes

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