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

Static analysis result for SHA-256 f40b18fabbc45279…

MALICIOUS

Office (OLE) / .XLS

1.55 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-07
MD5: 3aa464d041710ee6f82a88ea3a6dfa44 SHA-1: 7a28e5ab6bb17da6b24bd913e931a858e953f5e8 SHA-256: f40b18fabbc45279e4a7f98721218cbc563c51656add63e43c7a634921d87513
108 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. Although the VBA macros themselves do not contain executable statements, the presence of the vulnerable OLE object indicates a high likelihood of exploitation for initial execution.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
4df0cc85bbabbf336535fcce8826c56a353351704ad37250eb34fe3a108347ad		 ole-package OLE Ole10Native stream: MBD013BA6E2/oLE10naTIVE 1952 bytes

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