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

Static analysis result for SHA-256 0f56888b169d4186…

MALICIOUS

Office (OLE) / .XLS

1.02 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-14
MD5: 8a750fc4e436bcba11010adef0b1bdc8 SHA-1: 64816260b9df7edc76d4a5faa27b3a291e7d78ad SHA-256: 0f56888b169d41864fc185dc20d2a06d51b244bbba8b54661c1683d2d43bd863
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an Excel file containing an embedded Equation Editor OLE object. Static analysis identified a critical vulnerability, CVE-2017-11882, associated with this object, indicating it's likely used to exploit a known Equation Editor flaw. No VBA macros were found to be executable, but the presence of the vulnerable OLE object strongly suggests the file's purpose is to exploit this vulnerability to execute a secondary payload.

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
ce2c4faa21b107724fd8844b5106e71ea3d956add1fdc3b68dfb59378b9f5bf2		 ole-package OLE Ole10Native stream: MBD00AA0EB1/OLE10NATive 1807 bytes

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