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

Static analysis result for SHA-256 cdca5bbacc8ca195…

MALICIOUS

Office (OLE) / .XLS

1.02 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-08
MD5: c017f228fc0c09dc33d9d4d0a243cc67 SHA-1: f5504e64370bb5d8d70b4796a1d92ff3819f768c SHA-256: cdca5bbacc8ca195d929b58cffa8b459ec3b585d60c0d41537e97b78b4f65916
110 Risk Score

Malware Insights

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

The sample is an Excel file containing a malicious OLE object exploiting CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, and the embedded URL was benign. The primary threat stems from the Equation Editor exploit itself.

Heuristics 4

  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

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
9f6cbfb4c03892d67cf81e8dfd42e5b74e117b5d178ef811f09511fc4cf6f7db		 ole-package OLE Ole10Native stream: MBD01DD72E5/oLE10nAtiVE 2274 bytes

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