Xls.Dropper.Agent-8941228-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 4fdd720aeb7eae78…

MALICIOUS

Office (OLE) / .XLS

338.0 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel
MD5: 164526d014993f1b88a4ff8b98656108 SHA-1: 9ca2452d2cc9a8254c0e10e7eb13d989bfd88eed SHA-256: 4fdd720aeb7eae78f4329c55f02205bfc0b6b846e6acd36ac73121d1ea961b03
160 Risk Score

Malware Insights

Xls.Dropper.Agent-8941228-0 · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

This XLS file contains Excel 4.0 (XLM) macros, specifically an Auto_Open macro that utilizes dangerous formula APIs. The document also contains a lure impersonating a signing service to trick users into enabling macros. ClamAV identified this file as Xls.Dropper.Agent-8941228-0, indicating its function as a dropper. The embedded document body text, though heavily obfuscated, appears to be part of the lure mechanism.

Heuristics 6

  • ClamAV: Xls.Dropper.Agent-8941228-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8941228-0
  • XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b409eabd054f37186024acda3d1094fd9f80932c0a6236f5e9e934232a1b76e7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 88532 bytes

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