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

Static analysis result for SHA-256 05ce3caf5d51feb6…

MALICIOUS

Office (OLE) / .XLS

1.52 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-15
MD5: 7ab56593bc185fc81b67ebefecf77f2c SHA-1: bdb56dea6913e7215cdd5121b151de0402127a01 SHA-256: 05ce3caf5d51feb6fb8088375e4c6465cc521547cbb63bb51de09a5a5a50a807
150 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-11882 indicates the file contains a payload designed to exploit this specific vulnerability in the Equation Editor OLE object. While no VBA code was found to be executable, the presence of the exploit payload strongly suggests the file's purpose is to compromise the user's system upon opening. The file is an Excel spreadsheet, and the exploit is delivered via an embedded Equation Editor object.

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 EDI) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDI)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

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
052ce0cc9ec9a00ea800e14855f964796a8f74450415f7b8b5d4eb9728d4cb41		 ole-package OLE Ole10Native stream: MBD011AB93D/Ole10natIvE 1582 bytes

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