Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c3b91a6534832da3…

MALICIOUS

Office (OLE)

335.5 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 415e0074c4fdf230fe7fb001d6a1c3ba SHA-1: 8215c5a3a81685ff5b4a1a9921391473c6e1d930 SHA-256: c3b91a6534832da3137c17969de0ddb0c2961c8de9fbe7cfeb5dc34d1b3994a6
242 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook containing an Auto_Open macro, which is a strong indicator of malicious intent. Heuristics indicate the presence of dangerous API calls within the macro and a lure to enable content. ClamAV also detected it as a dropper. The macro sheet likely contains code to download and execute a second-stage payload, though the specific URL is not directly extractable from the provided evidence.

Heuristics 7

  • ClamAV: Xls.Dropper.Agent-9053796-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9053796-0
  • 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.
  • 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# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 85922 bytes
SHA-256: 4c63b233d7f183ab274d970968f087a3286e8edf8451863533ce847af276ffc1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Sheet
' 0085     10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  u
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     61 LABEL : Cell Value, String Constant - acwZdrCXkXKlIGiQhTXxXicurPkJCxJaoKxIfaEFlGLTJo len=0 
' 0018     27 LABEL : Cell Value, String Constant - aIKeHMZWFSrr len=0 
' 0018     21 LABEL : Cell Value, String Constant - aiXDyy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!BN10290 
' 0018     62 LABEL : Cell Value, String Constant - ayQqQbVnXtdouqCThpqBYTwxelEMChcdbgRYfvXWmcfWvYD len=0 
' 0018     17 LABEL : Cell Value, String Constant - aZ len=0 
' 0018     30 LABEL : Cell Value, String Constant - aZCiBmqQqCvOLhE len=0 
' 0018     50 LABEL : Cell Value, String Constant - BEvVjcNuwRtyMXrFseGcbDkCnrSsExQNjGe len=0 
' 0018     40 LABEL : Cell Value, String Constant - BjXsiZnxggTTuDQrLqPgsgeYq len=0 
' 0018     52 LABEL : Cell Value, String Constant - BLidHIouOWMrmnlqbipGhgwmogGiNLthDsjxI len=0 
' 0018     54 LABEL : Cell Value, String Constant - BLidHJoJPXMrBCzFcipUhgwBDuUibMtvQsxLIqE len=0 
' 0018     36 LABEL : Cell Value, String Constant - bpLNWgbFUmHaUKpyyxDng len=0 
' 0018     51 LABEL : Cell Value, String Constant - bSgqZYMMnvIkEjIZlZXRjgDmxEzLcdyzKhOr len=0 
' 0018     31 LABEL : Cell Value, String Constant - bVnkIdCIEQThDFOY len=0 
' 0018     46 LABEL : Cell Value, String Constant - BvZbIchpeLTUSXuCJmzyPTWNmCueMOj len=0 
' 0018     33 LABEL : Cell Value, String Constant - ccbfRKRvIIXbeWuKDm len=0 
' 0018     45 LABEL : Cell Value, String Constant - ccbgDKRvJIYbeWuKDmUXrUYmjSfFFg len=0 
' 0018     19 LABEL : Cell Value, String Constant - Ccbr len=0 
' 0018     55 LABEL : Cell Value, String Constant - CCRVYQoEwgORlOSgcMZyyaiuXqWtMlMXRjTpZkpl len=0 
' 0018     38 LABEL : Cell Value, String Constant - cHFmbvmdqBkjXXyHTvPuSkw len=0 
' 0018     61 LABEL : Cell Value, String Constant - CjBmqQqCvOLiEcURctIdRaysWYFZemcIRRQUryGkwwMQTL len=0 
' 0018     26 LABEL : Cell Value, String Constant - cnFUbdmKFik len=0 
' 0018     22 LABEL : Cell Value, String Constant - CNHZWtP len=0 
' 0018     19 LABEL : Cell Value, String Constant - CnrS len=0 
' 0018     24 LABEL : Cell Value, String Constant - CPooQYlNg len=0 
' 0018     19 LABEL : Cell Value, String Constant - CQlZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - CQxPBFfTRLca len=0 
' 0018     30 LABEL : Cell Value, String Constant - CriwHppcPpMZnUm len=0 
' 0018     55 LABEL : Cell Value, String Constant - csLfysiOXXWbMFMqEDTWZRpFxhQSmPThrNaOzbxv len=0 
' 0018     45 LABEL : Cell Value, String Constant - cUQcsIdRaxsWYFZemcIRRPUryGkwwM len=0 
' 0018     37 LABEL : Cell Value, String Constant - CwxvBlszQrqHwyqQsXVErN len=0 
' 0018     64 LABEL : Cell Value, String Constant - CXvCxJNbwyISMpGYsMGvbkkjnZSZEQQfjmeDSLucfzcguFana len=0 
' 0018     40 LABEL : Cell Value, String Constant - dCfKtpeypgtEnmaMnKWkSjVZz len=0 
' 0018     31 LABEL : Cell Value, String Constant - ddFNaCWBZqRrDwPx len=0 
' 0018     57 LABEL : Cell Value, String Constant - dDSLucfzcguqZnNNnwJlFkIazalfxhEnxEzMdrzBKh len=0 
' 0018     30 LABEL : Cell Value, String Constant - denMGjlSYrzpVQR len=0 
' 0018     35 LABEL : Cell Value, String Constant - DfKIpeypgtFnmaaCKWyS len=0 
' 0018     42 LABEL : Cell Value, String Constant - dfLfksiOXYWbyFMqEDTWZRqFxiQ len=0 
' 0018     28 LABEL : Cell Value, String Constant - DGwWyebKxTJzO len=0 
' 0018     47 LABEL : Cell Value, String Constant - DhfNCWMDRbKKwwYgtVpUsKWLICURoYio len=0 
' 0018     46 LABEL : Cell Value, String Constant - DHgUSMebxUsyuGJYtuFOJmCVpIDsYgh len=0 
' 0018     62 LABEL : Cell Value, String Constant - DHgVSMebyUsyuHKYtvFPKmDVpJDsYhhglWPWBONdgjbzPIr len=0 
' 0018     56 LABEL : Cell Value, String Constant - dHljRGaRIVfPOCCclxatZwPbPNHZWscmsoBSTopyW len=0 
' 0018     40 LABEL : Cell Value, String Constant - DHVRzOmnOXjMfLiBaBMGYHeOY len=0 
' 0018     52 LABEL : Cell Value, String Constant - dHXDKdkaGBCzFqjqVvhw
... (truncated)

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