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

Static analysis result for SHA-256 c6f3fefc6331b5ff…

MALICIOUS

Office (OLE) / .XLS

1.21 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-30
MD5: 890afc70ec7cae0f37bf4c76ee9159a3 SHA-1: b3d0a77786bfc53d8feb3fdd7d1522c489d5a442 SHA-256: c6f3fefc6331b5ff0eb910aea106eed3eda8dd01e0137333637b6297e7182923
110 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This technique is commonly used to execute arbitrary code. Although no VBA macros were found to be executable, the presence of the exploit object strongly suggests a malicious intent to compromise the system.

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
    • 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/
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships

Extracted artifacts 3

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
f81b5dc0f134bff67b32850863689811e3ff1dad6ed5cd918403c20cc4d6ab1e		 ole-package OLE Ole10Native stream: MBD00755EF9/Ole10Native 30803 bytes
ole10native_02.bin
c18e3b127737abac00e53641e4fb88cbf1b5b01e53852f3c87151cc807c9cd95		 ole-package OLE Ole10Native stream: MBD00755F00/oLE10nATiVe 1599 bytes

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