Xls.Dropper.Agent-8940498-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 19a1f6546cece685…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel
MD5: 6b1a1c7461aaf71e3857232a4412e4fc SHA-1: 51c02cffabb7d7bf7fbc99b2d6d15a91a1eea1dd SHA-256: 19a1f6546cece68543aac388416cdf867ef8aee9061a6ed902d45ce49715a69c
242 Risk Score

Malware Insights

Xls.Dropper.Agent-8940498-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet that contains an Auto_Open macro. Heuristics indicate the document uses a lure to trick the user into enabling macros, impersonating a signing service. ClamAV identified this as Xls.Dropper.Agent-8940498-0, suggesting its purpose is to drop a secondary payload. The embedded URLs are confirmed benign, but the presence of XLM macros and the lure strongly indicate malicious intent.

Heuristics 7

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • ClamAV: Xls.Dropper.Agent-8940498-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8940498-0
  • 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
9aa9437f76760e5454dbee3a0731bde1ad71b22fca32a796dab924dff5e17f31		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 117488 bytes

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