Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d4a1632119f57a9f…

MALICIOUS

Office (OLE)

354.5 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: f35d6831c7e3a86fa456a70a0e0e639d SHA-1: bd7a2f2ec5f0dfeb8db6a1ea94370091700d8b43 SHA-256: d4a1632119f57a9fbbb43e3f322babf9de6fc6a7bfe902b8beaf3eb8207a7e07
182 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled document that uses an Auto_Open macro to execute. It contains a lure to enable macros, impersonating a document signing service. The XLM macro sheet contains a call to the RUN function, indicating it likely downloads and executes a second-stage payload. The embedded URLs are confirmed benign, and no other IOCs were extracted.

Heuristics 6

  • 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) 105215 bytes
SHA-256: 172c2eaae029db64c96620ed1bb8c8afdc9738df5c8a508266163414a76bbc19
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 -  p
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     16 LABEL : Cell Value, String Constant - a len=0 
' 0018     51 LABEL : Cell Value, String Constant - aeEspjCyWrQWSehvRTcmgKasNgaQvFFEItmt len=0 
' 0018     45 LABEL : Cell Value, String Constant - ahLYXnrulLaTDkmIkoDyhvVVvFRtNs len=0 
' 0018     34 LABEL : Cell Value, String Constant - ahzIxdYZXcNHOrTEUYb len=0 
' 0018     61 LABEL : Cell Value, String Constant - asBqWRSQVHzHlMwNRULkNscYNhXOcmVVIuVrFTBSEIhWTN len=0 
' 0018     21 LABEL : Cell Value, String Constant - aTDknI len=0 
' 0018     27 LABEL : Cell Value, String Constant - aukbpziiVIjG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!GM11834 
' 0018     27 LABEL : Cell Value, String Constant - avxHRMpFXrLF len=0 
' 0018     26 LABEL : Cell Value, String Constant - aZNyawJXFWI len=0 
' 0018     30 LABEL : Cell Value, String Constant - BbbqgjbzdIGncwn len=0 
' 0018     48 LABEL : Cell Value, String Constant - bBpmgyvToNTPaesOQZjdHXpKdXNsCCBFq len=0 
' 0018     21 LABEL : Cell Value, String Constant - bEigPD len=0 
' 0018     31 LABEL : Cell Value, String Constant - bEXDasFsqkDzWGRW len=0 
' 0018     43 LABEL : Cell Value, String Constant - bRwrsqvgnuLmlCrulLnSQymIxoDN len=0 
' 0018     38 LABEL : Cell Value, String Constant - btCrXSTRWIBImNyOSVMlOtd len=0 
' 0018     19 LABEL : Cell Value, String Constant - BTQm len=0 
' 0018     54 LABEL : Cell Value, String Constant - bTrVzjfUoeVjtccPCdzMaIZLPodaUmjHcBHDPSg len=0 
' 0018     32 LABEL : Cell Value, String Constant - buDrXTTSXIBImNyPS len=0 
' 0018     32 LABEL : Cell Value, String Constant - BwIZovxHeZDFlrLTI len=0 
' 0018     23 LABEL : Cell Value, String Constant - BxgtTTuD len=0 
' 0018     33 LABEL : Cell Value, String Constant - BYelQdcsvyqQeXIprM len=0 
' 0018     60 LABEL : Cell Value, String Constant - cafRKRuWHXbeVuXDmiWrhYmwffSFfCPdLcOSrgdXpmJfE len=0 
' 0018     53 LABEL : Cell Value, String Constant - CaVxzgBGOEjssrwTahMZYorumLaTDlnIkpDziv len=0 
' 0018     39 LABEL : Cell Value, String Constant - CbCNHZJfPZfbnFTbclJEhjQW len=0 
' 0018     19 LABEL : Cell Value, String Constant - CbEj len=0 
' 0018     27 LABEL : Cell Value, String Constant - cBQJsadxaeso len=0 
' 0018     38 LABEL : Cell Value, String Constant - cbrvxpPeWHoqLnsGDlyYYzJ len=0 
' 0018     56 LABEL : Cell Value, String Constant - ccbgDKRvJIYbeWuKDmVXrUYmjSfFFgoBdwcBSsSdX len=0 
' 0018     53 LABEL : Cell Value, String Constant - CcOehkcBeJsodxoesDllYLmJVjRiUYymjdvsQl len=0 
' 0018     54 LABEL : Cell Value, String Constant - CCpbDZlzhykoPDztMJgCagcorGbdmwrVkDXqkaG len=0 
' 0018     56 LABEL : Cell Value, String Constant - cDcoizjGpBHDOftCDNkfJKqxQYOtopnsekrJjiyor len=0 
' 0018     24 LABEL : Cell Value, String Constant - cDOIaJfPa len=0 
' 0018     51 LABEL : Cell Value, String Constant - cDZYzhylpPpBuNKgDbTPbrHcQZwrVXEXdlaG len=0 
' 0018     46 LABEL : Cell Value, String Constant - cElDosTtFyROkGfXTevLgUdBvZbIbhp len=0 
' 0018     20 LABEL : Cell Value, String Constant - CENXS len=0 
' 0018     38 LABEL : Cell Value, String Constant - cftPRakfJYqLeYOtDECHrkr len=0 
' 0018     56 LABEL : Cell Value, String Constant - cfuQRakfJYrLeZOtDECHrkrWjiyDFwWldOvxSuzNY len=0 
' 0018     21 LABEL : Cell Value, String Constant - cgGgrl len=0 
' 0018     52 LABEL : Cell Value, String Constant - ChcdbgRYfvWWlceWvYDBiXriZmxgfTTuDPrLq len=0 
' 0018     43 LABEL : Cell Value, String Constant - clKqUjQWpxnTOPNSDvEhJtKOQIhK len=0 
' 0018     60 LABEL : Cell Value, String Constant - cmKFijQXpxnTOPNSEKRiJIYORIhKpnVKeULZjSSFFgoCd len=0 
' 0018     34 LABEL : Cell Value, String Constant - COcKbNRrfdXpmJeEJGR len=0 
' 0018     29 LABEL : Cell Value, String Constant - cPTsgeYqnKgFLH len=0 
' 0018     28 LABEL : Cell Value, String Constant - CRKtbeybftEZm len=0 
' 0018     63 LABEL : Cell Value, String Constant - CsHRzzmmOWjLeKizM
... (truncated)

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