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

Static analysis result for SHA-256 bfc32e119ab95bee…

MALICIOUS

Office (OLE) / .XLS

1.02 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-11
MD5: 76b15c3a56f8ad8cf55935f9800e25de SHA-1: dc2172f1a55fb99c353bf2fa8a73470633dc0ce2 SHA-256: bfc32e119ab95beecd69c1b8bb96a4fe849d3b0dcd72f22bacf9e02a507902d4
150 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 loaded. The VBA macros are present but do not contain executable statements, suggesting the primary malicious functionality is within the Equation Editor object itself. The embedded URL is benign and likely related to the Office schema.

Heuristics 5

  • 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.
  • x86 GetPC stub (CALL $+5; POP EBP) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EBP)
  • 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
5375fc2a308f19092fe0fad01a1cedfe5a2074dda5753aea0cd0e65f9a645928		 ole-package OLE Ole10Native stream: MBD01F492D5/oLe10NatIVe 1597 bytes

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