Xls.Downloader.94c25b356b5a6cac-9978798-0 — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 ccbcacb9d7c41706…

MALICIOUS

Office (OLE) / .XLSX

1.81 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-06
MD5: b7b547d017f9576698b464f93997b0ee SHA-1: 0ae98a894517fb36cce84d023a7922cbec81ffad SHA-256: ccbcacb9d7c41706508c6518b5976d043b1d41624deb5ce5049eb1a6eb8192e3
170 Risk Score

Malware Insights

Xls.Downloader.94c25b356b5a6cac-9978798-0 · confidence 95%

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

The critical heuristic firing for CVE-2017-11882 indicates the file exploits a known vulnerability in the Equation Editor OLE object to execute arbitrary code. Although no VBA macros were found to contain executable statements, the presence of the Equation Editor OLE object strongly suggests a downloader or exploit delivery mechanism. The ClamAV detection further confirms its malicious nature.

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.
  • ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
  • 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/

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
1608d8f79152715d517f45e8946f7f846c8bd8bfaed9b142fd6c737e0c843a4c		 ole-package OLE Ole10Native stream: MBD013770D6/OlE10nAtIVE 1993 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.